Product Image

Extra Strength Hair Skin & Nails

Spring Valley
4.6
★ ★ ★ ★ ★
(8447 ratings)
Biotin 5000 mcg
Vitamin A 5000 IU
Niacin 25 mg
Vitamin D 2000 IU
PABA 10 mg
Silicon 30 mg
Folate 400 mcg
Product Image
Score71
Best suited to nail health, with the clearest benefits coming from the disclosed active ingredients. Synthetic vitamin E, silicon dioxide, trace collagen, trace hyaluronic acid, and minimal horsetail limit form and dose quality.
How scoring works
Quantity:120 Softgel(s) • (40 servings)
Goals:
Nail Health
Immunity
Hair Health

Score 71

Best suited to nail health, with the clearest benefits coming from the disclosed active ingredients. Synthetic vitamin E, silicon dioxide, trace collagen, trace hyaluronic acid, and minimal horsetail limit form and dose quality.
How scoring works
$6.88($0.17 per serving)
Walmart
$ 6.88
Report prices

Analysis

High-potency d-biotin, vitamin D3, vitamin C, zinc, and a softgel oil base support a focused hair, skin, and nail formula. Synthetic vitamin E, silicon dioxide, trace collagen, trace hyaluronic acid, and minimal horsetail limit form and dose quality. The low serving cost creates strong practical value despite several token beauty additions.

A high biotin amount directly targets brittle nails, while silica, zinc, and vitamin C provide supporting structural and nutritional roles. The dedicated hair, skin, and nail design is clearly aligned with the goal. Hydrolyzed collagen and hyaluronic acid are present only in very small amounts, and silicon dioxide is not a premium soluble silicon source.

Zinc and a trace amount of hydrolyzed collagen provide only tangential gut-lining relevance. The 60 mg collagen amount is far below a structural-support dose, and no fiber, enzyme, probiotic, motility, or soothing ingredient is present. The formula is built for hair, skin, and nails rather than digestion.

Who is it for
  • People seeking nail health support
  • People seeking immunity support
  • People seeking hair health support
Best for
  • Nail Health
  • Immunity
  • Hair Health

Pros

  • High-potency d-biotin, vitamin D3, vitamin C, zinc, and a softgel oil base support a focused hair, skin, and nail formula.
  • The high biotin amount can distort thyroid, hormone, and cardiac troponin blood tests, so use should be disclosed before laboratory testing.
  • A high biotin amount directly targets brittle nails, while silica, zinc, and vitamin C provide supporting structural and nutritional roles.
  • The dedicated hair, skin, and nail design is clearly aligned with the goal.
  • The formula is therefore driven mainly by biotin rather than balanced structural depth.

Cons

  • Synthetic vitamin E, silicon dioxide, trace collagen, trace hyaluronic acid, and minimal horsetail limit form and dose quality.
  • The low serving cost creates strong practical value despite several token beauty additions.
  • Hydrolyzed collagen and hyaluronic acid are present only in very small amounts, and silicon dioxide is not a premium soluble silicon source.
  • The product is designed for hair and nail support, and zinc, selenium, and vitamin C are below focused immune amounts.
  • Collagen and horsetail are present only in trace amounts, while silicon dioxide is less absorbable than preferred silicon forms.

Warnings

  • The high biotin amount can distort thyroid, hormone, and cardiac troponin blood tests, so use should be disclosed before laboratory testing.
  • The high biotin amount can interfere with some thyroid, hormone, and cardiac blood tests, so it should be disclosed before laboratory testing.
  • The high biotin amount may distort thyroid, cardiac, and other laboratory tests unless use is disclosed before testing.
  • The 5,000 mcg d-biotin dose can interfere with some thyroid, hormone, and cardiac blood tests, so it should be disclosed before testing.
  • High-dose biotin can interfere with some laboratory tests, so users should tell the testing clinician before blood work.

Nutrient quality

60 Moderate impact

D-biotin and oil-based vitamin D3 are useful form choices. Conventional B-vitamin forms and very small structural ingredients weaken the otherwise meaningful core.

Ingredient transparency

76 High impact

The supplied facts disclose the active amounts and show no hidden blend. Repeated nutrient labels and missing excipient information leave some uncertainty.

Customer satisfaction

72 High impact

The supplied average rating is strong and supported by a very large number of reviews. No review text is available to identify repeated complaints or purpose-specific experiences.

Value for money

78 High impact

The meaningful vitamin and biotin core is inexpensive per serving. Token-dose oils and structural ingredients weaken the apparent breadth but do not erase the strong basic value.

Report analysis

Goals

Nail Health
Nail Health
Impact
High effect
B+ Goal FitC Strength of SupportB- CoverageB- Formula Quality
Silicon · 30 mgCollagen · 60 mgBiotin · 5000 mcgHorsetail · 3 mg

A high biotin amount directly targets brittle nails, while silica, zinc, and vitamin C provide supporting structural and nutritional roles. The dedicated hair, skin, and nail design is clearly aligned with the goal.

Hydrolyzed collagen and hyaluronic acid are present only in very small amounts, and silicon dioxide is not a premium soluble silicon source. The formula is therefore driven mainly by biotin rather than balanced structural depth.

Study evidence
Biotin Supportive 8 studies
Collagen Supportive 4 studies
Horsetail Not classified

No linked studies yet.

Silicon Supportive 2 studies
Vitamin C Supportive 1 study
Zinc No effect 1 study
Immunity
Immunity
Impact
High effect
B- Goal FitC+ Strength of SupportB- CoverageC+ Formula Quality
Vitamin C · 90 mgZinc · 7.5 mgVitamin A · 5000 IUVitamin D · 2000 IUSelenium · 12.5 mcg

Vitamin A, vitamin D3, vitamin C, zinc gluconate, and selenium provide some nutritional support for immune barriers and cell function. The oil-based softgel is favorable for absorption of the fat-soluble vitamins.

The product is designed for hair and nail support, and zinc, selenium, and vitamin C are below focused immune amounts. Collagen, silica, oils, and beauty-focused extras add little direct immune depth.

Study evidence
Selenium Mixed 37 studies
Vitamin A Supportive 107 studies
Vitamin C Supportive 53 studies
Vitamin D Supportive 85 studies
Zinc Supportive 73 studies
Hair Health
Hair Health
Impact
High effect
B- Goal FitC Strength of SupportC CoverageC Formula Quality
Biotin · 5000 mcgVitamin D · 2000 IUZinc · 7.5 mgVitamin C · 90 mgCollagen · 60 mg

High-dose d-biotin and vitamin D3 provide the clearest hair support, with zinc, silica, horsetail, and collagen adding broader mechanisms. Collagen and horsetail are present only in trace amounts, while silicon dioxide is less absorbable than preferred silicon forms.

The high biotin amount can interfere with some thyroid, hormone, and cardiac blood tests, so it should be disclosed before laboratory testing. Strong biotin potency does not fully compensate for the underdosed structural ingredients and mixed form quality.

Study evidence
Biotin Supportive 4 studies
Collagen Supportive 3 studies
Horsetail Not classified

No linked studies yet.

Silicon Supportive 2 studies
Vitamin D Disputed 34 studies
Zinc Supportive 22 studies
Energy
Energy
Impact
Moderate effect
B- Goal FitC- Strength of SupportD+ CoverageC+ Formula Quality
Vitamin D · 2000 IUVitamin B5 · 15 mgRiboflavin · 5 mgThiamin · 5 mgVitamin B12 · 8 mcg

B vitamins and vitamin D offer some support for normal energy metabolism and muscle function. An oil-based softgel should help absorb vitamin D.

The formula is primarily designed for hair, skin, and nails, while B12 and the other energy-related nutrients are modest. Collagen, oils, and beauty ingredients add little direct support for sustained energy.

Study evidence
Vitamin D Supportive 32 studies
General Health
General Health
Impact
Moderate effect
C Goal FitD+ Strength of SupportC- CoverageC Formula Quality
Folate · 400 mcgVitamin B12 · 8 mcgVitamin D · 2000 IUCollagen · 60 mgSelenium · 12.5 mcgZinc · 7.5 mgVitamin C · 90 mg

The vitamin and mineral base offers some foundational value, with vitamin D3 supplied in a useful oil-based softgel format. Biotin and related nutrients fit the hair, skin, and nail focus but do not create comprehensive general-health coverage.

Collagen and hyaluronic acid are present only in very small amounts, and several vitamins use basic forms. The formula is better suited to a narrow beauty goal than to broad daily wellness support.

Study evidence
Collagen Supportive 31 studies
Vitamin D Supportive 115 studies
Anti-Inflammatory Support
Anti-Inflammatory Support
Impact
Moderate effect
D+ Goal FitC- Strength of SupportD+ CoverageC+ Formula Quality
Vitamin D · 2000 IUCollagen · 60 mgVitamin E · 30 IUVitamin C · 90 mg

Vitamin D, vitamin C, vitamin E, zinc, and selenium provide basic immune and antioxidant support. Hydrolyzed collagen is present at a token amount and does not create a meaningful direct anti-inflammatory pathway.

The vitamin D amount is material and clearly stated, while most other goal-relevant ingredients are modest. The formula is better aligned with hair, skin, and nails than with systemic inflammation.

Study evidence
Collagen Supportive 5 studies
Selenium Supportive 34 studies
Vitamin C Supportive 50 studies
Vitamin D Supportive 101 studies
Vitamin E Supportive 20 studies
Zinc Supportive 64 studies
Testosterone Support
Testosterone Support
Impact
Moderate effect
C- Goal FitC+ Strength of SupportD CoverageF Formula Quality
Zinc · 7.5 mgVitamin D · 2000 IU

Vitamin D3 provides a meaningful foundation for normal hormone production. Zinc adds support, but its amount is modest for a focused testosterone formula.

Most of the formula targets hair, skin, and nails rather than endocrine pathways. It may suit broad nutrient coverage better than dedicated testosterone support.

Study evidence
Vitamin D Supportive 56 studies
Zinc Disputed 7 studies

Ingredients

IngredientAmount per serving
Vitamin A (Retinyl Palmitate)
 5000 IU
Vitamin C (Ascorbic Acid)
 90 mg
Vitamin D3 (Cholecalciferol)
 2000 IU
Vitamin E (DL-Alpha-Tocopheryl Acetate)
 30 IU
Thiamine (Thiamine Mononitrate, Vitamin B1)
 5 mg
Riboflavin (Vitamin B2)
 5 mg
Niacin (Niacinamide)
 25 mg
Vitamin B6 (Pyridoxine Hydrochloride)
 5 mg
Folic Acid
400 mcg
Vitamin B12 (Cyanocobalamin)
 8 mcg
Biotin (D-Biotin)
 5000 mcg
Pantothenic Acid (D-Calcium Pantothenate)
 15 mg
Zinc (Zinc Gluconate)
 7.5 mg
Selenium (Selenium Yeast)
 12.5 mcg
Argan Oil
25 mg
PABA
10 mg
Horsetail
3 mg
hydrolyzed Collagen
60 mg
Hyaluronic Acid (Sodium Hyaluronate)
 1 mg
Silica (Silicon Dioxide)
 30 mg
extra virgin organic Coconut Oil
50 mg
Women 18–50
Report overview
Biotin (D-Biotin) · 5000 mcg OverallScore96
A+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyB+ Value

The 5000 mcg biotin dose reaches the strongest target range for hair and nail support. The label explicitly verifies biologically active d-biotin. High-dose biotin can interfere with some laboratory tests, so users should tell the testing clinician before blood work.

View ingredientView products
Vitamin A (Retinyl Palmitate) · 5000 IU OverallScore80
C- Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyB+ Value

A well-placed dose is delivered only as preformed retinyl palmitate, which is less adaptable than carotenoid sources. Added plant oils make the softgel favorable for absorption. The standardized dose is inexpensive for a broad hair-support formula.

View ingredientView products
Vitamin D (Cholecalciferol) · 2000 IU OverallScore76
A Active Ingredient Quality & BioavailabilityC+ Dose, Safety & Label TransparencyC Value

The vitamin D amount sits in the preferred daily range. The preferred D3 form is used, although its raw source is not named. An oil-based softgel supports absorption.

View ingredientView products
Loading alternative details
65 Performance

Extra Strength Hair Skin & Nails

Nature's Bounty Optimal Solutions
<p>D-biotin, zinc, manganese, and a much larger hyaluronic acid amount give this formula a more substantial beauty-support base than the original. Collagen and horsetail remain small additions, while high-dose biotin and preformed vitamin A still require care around blood tests and pregnancy.</p>
68 Performance

Hair Vitamins

SugarBearHair
<p>A simpler gummy centers on high-dose biotin with vitamin D3 and zinc citrate, which may suit someone who wants hair-focused nutrients without token collagen and oils. The remaining vitamins and minerals are modest, and high-dose biotin can still distort some laboratory results.</p>
59 Performance

Daily Total One

Country Life
<p>Active B-vitamin forms, methylcobalamin, natural vitamin E, citrate minerals, and disclosed silica offer stronger form quality than the original conventional vitamin base. The formula is not narrowly beauty-focused, and repeated entries plus high combined amounts make the label difficult to interpret.</p>
71 Budget

Norwegian Cod Liver Oil 1000 mg Fresh Orange Flavor

AN Amazing Nutrition Amazing Omega
<p>Cod liver oil with vitamin D3 and natural vitamin E offers a much lower-cost route to fat-soluble nutrients that may support skin health. It lacks biotin, zinc, collagen, and hyaluronic acid, while the preformed vitamin A amount requires care with other vitamin A sources.</p>
72 Budget

One Daily Women's Adult Gummy

Equate
<p>Vitamin D, vitamin E, folate, biotin, and zinc provide basic beauty-relevant nutrition at a lower serving cost and with far less biotin. Lower biotin reduces the laboratory-test concern, but unspecified nutrient forms and light mineral amounts make the formula less targeted.</p>
75 Budget

Multi Adult Gummies

Nature Made
<p>Biotin, vitamin C, vitamin D3, vitamin E, folate, and zinc provide broad nutritional support at a lower serving cost. The moderate biotin amount is easier to manage around blood testing, although the gummy omits collagen, silica, and hyaluronic acid.</p>
70 Value

Hair Skin & Nails

Nature's Bounty Optimal Solutions
<p>D-biotin, zinc, vitamin C, vitamin D3, and a broader mineral base keep the formula closely aligned with hair and nail support at reasonable serving value. Collagen and horsetail are still token additions, but the streamlined beauty profile is more cost-conscious than many targeted blends.</p>
70 Value

Hair Skin & Nails

Nature's Truth
<p>D-biotin, vitamin D3, natural vitamin E, vitamin C, zinc, and silica create a relevant beauty-support core with favorable value for a targeted formula. The collagen, hyaluronic acid, and horsetail amounts remain small, and high-dose biotin plus preformed vitamin A require the same practical cautions as the original.</p>
73 Value

Muti Vitamin Raspberry Flavor

Yum-V's Complete
<p>Vitamin D3, vitamin C, folate, biotin, and several B vitamins provide broad nutritional coverage without relying on token collagen or oils. Biotin and zinc are modest, but the simpler profile offers a practical value option for users seeking general nutrient support rather than a high-dose beauty formula.</p>
Report alternatives

Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. The Role of Sesbania grandiflora-Derived Biotin and Bambusa arundinacea-Derived Silica Extracts in Promoting Hair, Skin, and Nail Health: A Randomized, Double-Blind, Placebo-Controlled Clinical Study.
    Patel MN; Maheshvari J; Patel N · Cureus · 2025
    Randomized trial105 participantsSkin Health Hair Health Nail Health forBiotin
  2. Effect of oral intake of choline-stabilized orthosilicic acid on skin, nails and hair in women with photodamaged skin.
    Barel A; Calomme M; Timchenko A; De Paepe K; Demeester N; Rogiers V; Clarys P; Vanden Berghe D · Archives of dermatological research · 2006
    Randomized trial50 participantsSkin Health Hair Health Nail Health forSilicon
  3. Interventions for infantile seborrhoeic dermatitis (including cradle cap).
    Victoire A; Magin P; Coughlan J; van Driel ML · The Cochrane database of systematic reviews · 2019
    Systematic review35 participants2 studies pooledSkin Health forBiotin
  4. The Infatuation With Biotin Supplementation: Is There Truth Behind Its Rising Popularity? A Comparative Analysis of Clinical Efficacy versus Social Popularity.
    Soleymani T; Lo Sicco K; Shapiro J · Journal of drugs in dermatology : JDD · 2018
    Narrative reviewHair Health forBiotin
  5. Biotin for the treatment of nail disease: what is the evidence?
    Lipner SR; Scher RK · The Journal of dermatological treatment · 2018
    Narrative reviewNail Health forBiotin
  6. Treatment of brittle fingernails and onychoschizia with biotin: scanning electron microscopy.
    Colombo VE; Gerber F; Bronhofer M; Floersheim GL · Journal of the American Academy of Dermatology · 1991
    Other32 participantsNail Health forBiotin
  7. Brittle nails: response to daily biotin supplementation.
    Hochman LG; Scher RK; Meyerson MS · Cutis · 1993
    Case series35 participantsNail Health forBiotin
  8. Undenatured type II collagen for knee osteoarthritis.
    Gupta A; Maffulli N · Annals of medicine · 2025
    Systematic review12 studies pooledAnti-Inflammatory Support forCollagen
  9. Anti-inflammatory effect of collagen tripeptide in atopic dermatitis.
    Hakuta A; Yamaguchi Y; Okawa T; Yamamoto S; Sakai Y; Aihara M · Journal of dermatological science · 2018
    Randomized trial17 participantsAnti-Inflammatory Support forCollagen
  10. [Points of undenatured type II collagen application in musculoskeletal pain syndromes treatment].
    Shavlovskaya OA; Gromova OA; Torshin IY · Zhurnal nevrologii i psikhiatrii imeni S.S. Korsakova · 2022
    Narrative reviewAnti-Inflammatory Support forCollagen
  11. Ultrasound Guided Injection of Collagen for Elbow Lateral Epicondylitis - A Pilot Study.
    Porta F; Filippucci E; Barni X; Dinescu SC; Vreju FA · Current health sciences journal · 2026
    Single-arm trial13 participantsAnti-Inflammatory Support forCollagen
  12. Effects of porcine-derived collagen hydrolysates on 24 h blood pressure profiles, markers for endothelial dysfunction and low-grade inflammation and the retinal vasculature in adults with overweight/obesity: a randomized, controlled trial.
    Chavez-Alfaro MA; Mensink RP; Joris PJ; Plat J · Food & function · 2025
    Randomized trial56 participantsAnti-Inflammatory Support forCollagen
  13. Selenium and the course of mild Graves' orbitopathy.
    Marcocci C; Kahaly GJ; Krassas GE; Bartalena L; Prummel M; Stahl M; Altea MA; Nardi M; Pitz S; Boboridis K; Sivelli P; von Arx G; Mourits MP; Baldeschi L; Bencivelli W; Wiersinga W; European Group on Graves' Orbitopathy · The New England journal of medicine · 2011
    Randomized trial159 participantsAnti-Inflammatory Support forSelenium
  14. Effects of selenium supplementation on glucose homeostasis, inflammation, and oxidative stress in gestational diabetes: Randomized, double-blind, placebo-controlled trial.
    Asemi Z; Jamilian M; Mesdaghinia E; Esmaillzadeh A · Nutrition (Burbank, Los Angeles County, Calif.) · 2016
    Randomized trial70 participantsAnti-Inflammatory Support forSelenium
  15. Selenium Supplementation Affects Insulin Resistance and Serum hs-CRP in Patients with Type 2 Diabetes and Coronary Heart Disease.
    Farrokhian A; Bahmani F; Taghizadeh M; Mirhashemi SM; Aarabi MH; Raygan F; Aghadavod E; Asemi Z · Hormone and metabolic research = Hormon- und Stoffwechselforschung = Hormones et metabolisme · 2017
    Randomized trial60 participantsAnti-Inflammatory Support forSelenium
  16. The effects of selenium supplementation on cardiovascular risk factors in patients with metabolic diseases ‒ A systematic review and meta-analysis of randomized controlled trials.
    Qiu W; Huang N; Zhang K; Qiu H; Guo Z; Han F; Sun X; Hou N; Kan C · Nutricion hospitalaria · 2026
    Meta-analysis656 participants11 studies pooledAnti-Inflammatory Support forSelenium
  17. Effects of Selenium Supplementation on Metabolic Status in Patients Undergoing for Coronary Artery Bypass Grafting (CABG) Surgery: a Randomized, Double-Blind, Placebo-Controlled Trial.
    Kamali A; Amirani E; Asemi Z · Biological trace element research · 2020
    Randomized trial33 participantsAnti-Inflammatory Support forSelenium
  18. Efficacy of Vitamin C as Glucocorticoid Substitute for Reducing Pain and Inflammation After Total Hip Arthroplasty: A Randomized Controlled Trial.
    Jiang W; Xu H; Jiang X; Zhan Y; Ju Y; Xie J; Huang Z; Huang Q; Pei F · The Journal of bone and joint surgery. American volume · 2025
    Randomized trial107 participantsAnti-Inflammatory Support forVitamin C
  19. The Impact of Vitamin C on Analgesic, Anti-inflammatory, and Hemostatic Outcomes After Total Hip and Knee Arthroplasty: A Systematic Review and Meta-Analysis.
    Moftakhari Hajimirzaei S; Bagherzadeh Cham M; Dolikhani M; Tabatabaee SM; Ebrahimpour A · The archives of bone and joint surgery · 2026
    Meta-analysis1,162 participants10 studies pooledAnti-Inflammatory Support forVitamin C
  20. The impact of vitamin C supplementation on the perioperative outcomes after total hip and knee arthroplasty: a systematic review and meta-analysis.
    Liu X; Guo J; Li Y; Yang Y; Liu M; Gao Q; Yang Y; Wu X; Yue C · BMC musculoskeletal disorders · 2026
    Meta-analysis852 participants8 studies pooledAnti-Inflammatory Support forVitamin C
  21. Therapeutic Impact of Ascorbic Acid on Oral and Periodontal Tissues: A Systematic Literature Review.
    Ruzijevaite G; Acaite E; Jagelaviciene E · Medicina (Kaunas, Lithuania) · 2025
    Systematic review811 participants17 studies pooledAnti-Inflammatory Support forVitamin C
  22. Oral vitamin C administration reduces early recurrence rates after electrical cardioversion of persistent atrial fibrillation and attenuates associated inflammation.
    Korantzopoulos P; Kolettis TM; Kountouris E; Dimitroula V; Karanikis P; Pappa E; Siogas K; Goudevenos JA · International journal of cardiology · 2005
    Randomized trial44 participantsAnti-Inflammatory Support forVitamin C
  23. Vitamin D deficiency and C-reactive protein: a bidirectional Mendelian randomization study.
    Zhou A; Hyppönen E · International journal of epidemiology · 2023
    Observational study294,970 participantsAnti-Inflammatory Support forVitamin D
  24. Vitamin D in Children With Inflammatory Bowel Disease: A Randomized Controlled Clinical Trial.
    El Amrousy D; El Ashry H; Hodeib H; Hassan S · Journal of clinical gastroenterology · 2021
    Randomized trial120 participantsAnti-Inflammatory Support forVitamin D
  25. Vitamin D supplementation reduces infection rate and promotes wound healing in patients with diabetic foot ulcers.
    Gao YQ; Gao YH; Xing JH · World journal of diabetes · 2025
    Randomized trial120 participantsAnti-Inflammatory Support forVitamin D
  26. Associations of C-reactive Protein with 25-hydroxyvitamin D in 24 Specific Diseases: A Cross-sectional Study from NHANES.
    Yang F; Sun M; Sun C; Li J; Yang X; Bi C; Wang M; Pu L; Wang J; Wang C; Xie M; Yao Y; Jin L · Scientific reports · 2020
    Cross-sectional study9,809 participantsAnti-Inflammatory Support forVitamin D
  27. Combined effects of vitamin D deficiency and systemic inflammation on all-cause mortality and cause-specific mortality in older adults.
    Zhang C; Cui J; Li S; Shen J; Luo X; Yao Y; Shi H · BMC geriatrics · 2024
    Cohort study3,072 participantsAnti-Inflammatory Support forVitamin D
  28. Effects of delta-tocotrienol supplementation on Glycemic Control, oxidative stress, inflammatory biomarkers and miRNA expression in type 2 diabetes mellitus: A randomized control trial.
    Mahjabeen W; Khan DA; Mirza SA; Pervez MA · Phytotherapy research : PTR · 2021
    Randomized trial110 participantsAnti-Inflammatory Support forVitamin E
  29. Effect of vitamin E supplementation on serum C-reactive protein level: a meta-analysis of randomized controlled trials.
    Saboori S; Shab-Bidar S; Speakman JR; Yousefi Rad E; Djafarian K · European journal of clinical nutrition · 2016
    Meta-analysis495 participants12 studies pooledAnti-Inflammatory Support forVitamin E
  30. Efficacy of Nutritional Interventions on Inflammatory Markers in Haemodialysis Patients: A Systematic Review and Limited Meta-Analysis.
    Khor BH; Narayanan SS; Sahathevan S; Gafor AHA; Daud ZAM; Khosla P; Sabatino A; Fiaccadori E; Chinna K; Karupaiah T · Nutrients · 2018
    Meta-analysis46 studies pooledAnti-Inflammatory Support forVitamin E
  31. Vitamin E improves serum markers and histology in adults with metabolic dysfunction-associated steatotic liver disease: Systematic review and meta-analysis.
    Chee NM; Sinnanaidu RP; Chan WK · Journal of gastroenterology and hepatology · 2024
    Meta-analysis8 studies pooledAnti-Inflammatory Support forVitamin E
  32. Delta-tocotrienol supplementation improves biochemical markers of hepatocellular injury and steatosis in patients with nonalcoholic fatty liver disease: A randomized, placebo-controlled trial.
    Pervez MA; Khan DA; Slehria AUR; Ijaz A · Complementary therapies in medicine · 2021
    Randomized trial71 participantsAnti-Inflammatory Support forVitamin E
  33. Zinc decreases C-reactive protein, lipid peroxidation, and inflammatory cytokines in elderly subjects: a potential implication of zinc as an atheroprotective agent.
    Bao B; Prasad AS; Beck FW; Fitzgerald JT; Snell D; Bao GW; Singh T; Cardozo LJ · The American journal of clinical nutrition · 2010
    Randomized trial40 participantsAnti-Inflammatory Support forZinc
  34. Zinc Supplementation in Individuals with Prediabetes and type 2 Diabetes: a GRADE-Assessed Systematic Review and Dose-Response Meta-analysis.
    Nazari M; Nikbaf-Shandiz M; Pashayee-Khamene F; Bagheri R; Goudarzi K; Hosseinnia NV; Dolatshahi S; Omran HS; Amirani N; Ashtary-Larky D; Asbaghi O; Ghanavati M · Biological trace element research · 2024
    Meta-analysis23 studies pooledAnti-Inflammatory Support forZinc
  35. The Effects of Zinc Supplementation on C-Reactive Protein and Inflammatory Cytokines: A Meta-Analysis and Systematical Review.
    Ceylan MN; Akdas S; Yazihan N · Journal of interferon & cytokine research : the official journal of the International Society for Interferon and Cytokine Research · 2022
    Meta-analysis73 studies pooledAnti-Inflammatory Support forZinc
  36. The Effects of Zinc Sulfate Supplementation on Serum Copeptin, C-Reactive Protein and Metabolic Markers in Zinc-Deficient Diabetic Patients on Hemodialysis: A Randomized, Double-Blind, Placebo-Controlled Trial.
    Hosseini R; Montazerifar F; Shahraki E; Karajibani M; Mokhtari AM; Dashipour AR; Ferns GA; Jalali M · Biological trace element research · 2021
    Randomized trial46 participantsAnti-Inflammatory Support forZinc
  37. Zinc supplementation and cardiovascular disease risk factors: A GRADE-assessed systematic review and dose-response meta-analysis.
    Nazari M; Ashtary-Larky D; Nikbaf-Shandiz M; Goudarzi K; Bagheri R; Dolatshahi S; Omran HS; Amirani N; Ghanavati M; Asbaghi O · Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) · 2023
    Meta-analysis75 studies pooledAnti-Inflammatory Support forZinc
  38. Effect of Vitamin D Supplementation on Fatigue in Multiple Sclerosis: A Systematic Review and Meta-Analysis.
    López-Muñoz P; Torres-Costoso AI; Fernández-Rodríguez R; Guzmán-Pavón MJ; de Arenas-Arroyo SN; Basco-López JÁ; Reina-Gutiérrez S · Nutrients · 2023
    Meta-analysis345 participants5 studies pooledEnergy forVitamin D
  39. Vitamin D Supplementation in Adolescents and Young Adults With Juvenile Systemic Lupus Erythematosus for Improvement in Disease Activity and Fatigue Scores: A Randomized, Double-Blind, Placebo-Controlled Trial.
    Lima GL; Paupitz J; Aikawa NE; Takayama L; Bonfa E; Pereira RM · Arthritis care & research · 2016
    Randomized trial40 participantsEnergy forVitamin D
  40. Vitamin D in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome After COVID-19 or Vaccination: A Randomized Controlled Trial.
    Kodama S; Nakata M; Konishi N; Yoshino M; Fujisawa A; Naganuma M; Kobayashi Y; Hirai Y; Kitagawa A; Miyokawa M; Mishima R; Teramukai S; Fukushima M · Nutrients · 2026
    Randomized trial91 participantsEnergy forVitamin D
  41. The effects of vitamin D supplementation on disease activity and fatigue in Libyan rheumatoid arthritis patients.
    Elfituri S · Reumatologia · 2024
    Randomized trial68 participantsEnergy forVitamin D
  42. The effect of home-based aerobic training and vitamin D supplementation on fatigue and quality of life in patients with multiple sclerosis during COVID-19 outbreak.
    Bahmani E; Hoseini R; Amiri E · Science & sports · 2022
    Randomized trial40 participantsEnergy forVitamin D
  43. A double-blind, placebo-controlled, randomised, clinical study on the effectiveness of collagen peptide on osteoarthritis.
    Kumar S; Sugihara F; Suzuki K; Inoue N; Venkateswarathirukumara S · Journal of the science of food and agriculture · 2015
    Randomized trialGeneral Health forCollagen
  44. Efficacy and safety of native type II collagen in modulating knee osteoarthritis symptoms: a randomised, double-blind, placebo-controlled trial.
    Luo C; Su W; Song Y; Srivastava S · Journal of experimental orthopaedics · 2023
    Randomized trial101 participantsGeneral Health forCollagen
  45. Healing Process, Pain, and Health-Related Quality of Life in Patients with Venous Leg Ulcers Treated with Fish Collagen Gel: A 12-Week Randomized Single-Center Study.
    Mościcka P; Cwajda-Białasik J; Szewczyk MT; Jawień A · International journal of environmental research and public health · 2022
    Randomized trial100 participantsGeneral Health forCollagen
  46. Efficacy and Safety of Dietary Undenatured Type II Collagen on Joint and Motor Function in Healthy Volunteers: A Randomized, Double-Blind, Placebo-Controlled, Parallel-Group Study.
    Shiojima Y; Takahashi M; Takahashi R; Maruyama K; Moriyama H; Bagchi D; Bagchi M; Akanuma M · Journal of the American Nutrition Association · 2023
    Randomized trial64 participantsGeneral Health forCollagen
  47. The use of a collagen matrix in hard-to-heal venous leg ulcers.
    Romanelli M; Mulder G; Paggi B; Macchia M; Panduri S; Dini V · Journal of wound care · 2016
    Randomized trial40 participantsGeneral Health forCollagen
  48. Vitamin D supplementation for prevention of mortality in adults.
    Bjelakovic G; Gluud LL; Nikolova D; Whitfield K; Wetterslev J; Simonetti RG; Bjelakovic M; Gluud C · The Cochrane database of systematic reviews · 2014
    Meta-analysis95,286 participants159 studies pooledGeneral Health forVitamin D
  49. Effect of vitamin D on gastrointestinal symptoms and health-related quality of life in irritable bowel syndrome patients: a randomized double-blind clinical trial.
    Abbasnezhad A; Amani R; Hajiani E; Alavinejad P; Cheraghian B; Ghadiri A · Neurogastroenterology and motility · 2018
    Randomized trial90 participantsGeneral Health forVitamin D
  50. The impact of vitamin D administration on mortality in COVID-19 patients: a systematic review and meta-analysis of randomized controlled trials.
    Kow CS; Ramachandram DS; Hasan SS; Wong Z; Thiruchelvam K · Inflammopharmacology · 2024
    Meta-analysis2,495 participants19 studies pooledGeneral Health forVitamin D
  51. Vitamin D Status and Mortality: A Systematic Review of Observational Studies.
    Heath AK; Kim IY; Hodge AM; English DR; Muller DC · International journal of environmental research and public health · 2019
    Systematic review84 studies pooledGeneral Health forVitamin D
  52. Meta-analysis of long-term vitamin D supplementation on overall mortality.
    Zheng Y; Zhu J; Zhou M; Cui L; Yao W; Liu Y · PloS one · 2014
    Meta-analysis42 studies pooledGeneral Health forVitamin D
  53. Low serum biotinidase activity in children with valproic acid monotherapy.
    Schulpis KH; Karikas GA; Tjamouranis J; Regoutas S; Tsakiris S · Epilepsia · 2001
    Clinical trial125 participantsHair Health forBiotin
  54. Vitamins A, B, C, and D: A Short Review for the Dermatologist.
    Coerdt KM; Goggins CA; Khachemoune A · Alternative therapies in health and medicine · 2021
    Narrative reviewHair Health forBiotin
  55. Low-Molecular-Weight Collagen Peptide Supplementation Improves Cellulite Severity, Skin Elasticity, and Hair Shaft Diameter: A Clinical Study with Pharmacokinetic Evaluation.
    Hwang S; Won J; Kim S; Kang W; Park M · Journal of medicinal food · 2026
    Randomized trial114 participantsHair Health forCollagen
  56. Calcium and Vitamin D Supplementation with and Without Collagen on Bone Density and Skin Elasticity in Menopausal Women-A Randomized Controlled Study.
    Duangjai A; Srivilai J; Nangola S; Amornlerdpison D · Clinics and practice · 2025
    Randomized trialHair Health forCollagen
  57. Dietary Collagen Supplementation as a Strategy for Skin Health: A Narrative Review of Clinical Effects on Skin, Hair, Nails, and Wound Healing.
    Biełach-Bazyluk A; Jurga M; Flisiak I; Zbroch E · Nutrients · 2026
    Narrative reviewHair Health forCollagen
  58. Effect of oral intake of choline-stabilized orthosilicic acid on hair tensile strength and morphology in women with fine hair
    R R Wickett, E Kossmann, A Barel, N Demeester, P Clarys, D Vanden Berghe, M Calomme · Archives of Dermatological Research · 2007
    Randomized trial48 participantsHair Health forSilicon
  59. Increased prevalence of vitamin D deficiency in patients with alopecia areata: a systematic review and meta-analysis.
    Lee S; Kim BJ; Lee CH; Lee WS · Journal of the European Academy of Dermatology and Venereology : JEADV · 2018
    Meta-analysis2,039 participants14 studies pooledHair Health forVitamin D
  60. Intralesional vitamin D3 in treatment of alopecia areata: A randomized controlled clinical trial.
    Rashad AF; Elgamal E; Fouda I · Journal of cosmetic dermatology · 2022
    Randomized trial60 participantsHair Health forVitamin D
  61. Vitamin D and its Analogs in Treatment of Mild to Moderate Alopecia Areata: Systematic Review and Meta-Analysis.
    Alsaati AA; Kaliyadan F; Alsaadoun D; Alzakry LM; Alzabadin RA; Hakami TH; Rubaian NFB · Indian dermatology online journal · 2025
    Meta-analysisHair Health forVitamin D
  62. Topical calcipotriol vs narrowband ultraviolet B in treatment of alopecia areata: a randomized-controlled trial.
    El Taieb MA; Hegazy EM; Ibrahim HM; Osman AB; Abualhamd M · Archives of dermatological research · 2020
    Randomized trial60 participantsHair Health forVitamin D
  63. Serum 25 hydroxyvitamin D in non-scarring alopecia: A systematic review and meta-analysis.
    Chen Y; Dong X; Wang Y; Li Y; Xiong L; Li L · Journal of cosmetic dermatology · 2024
    Meta-analysis10,670 participants23 studies pooledHair Health forVitamin D
  64. The effects of minoxidil, 1% pyrithione zinc and a combination of both on hair density: a randomized controlled trial.
    Berger RS; Fu JL; Smiles KA; Turner CB; Schnell BM; Werchowski KM; Lammers KM · The British journal of dermatology · 2003
    Randomized trial200 participantsHair Health forZinc
  65. Incubatory environment of the scalp impacts pre-emergent hair to affect post-emergent hair cuticle integrity.
    Schwartz JR; Henry JP; Kerr KM; Flagler MJ; Page SH; Redman-Furey N · Journal of cosmetic dermatology · 2018
    Randomized trialHair Health forZinc
  66. A comparison of hair quality and cosmetic acceptance following the use of two anti-dandruff shampoos.
    Draelos ZD; Kenneally DC; Hodges LT; Billhimer W; Copas M; Margraf C · The journal of investigative dermatology. Symposium proceedings · 2006
    Randomized trial40 participantsHair Health forZinc
  67. BMI and levels of zinc, copper in hair, serum and urine of Turkish male patients with androgenetic alopecia.
    Ozturk P; Kurutas E; Ataseven A; Dokur N; Gumusalan Y; Gorur A; Tamer L; Inaloz S · Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) · 2015
    Case-control study216 participantsHair Health forZinc
  68. Analysis of serum zinc and copper concentrations in hair loss.
    Kil MS; Kim CW; Kim SS · Annals of dermatology · 2013
    Case-control study342 participantsHair Health forZinc
  69. Effects of selenium supplementation on selenoprotein gene expression and response to influenza vaccine challenge: a randomised controlled trial.
    Goldson AJ; Fairweather-Tait SJ; Armah CN; Bao Y; Broadley MR; Dainty JR; Furniss C; Hart DJ; Teucher B; Hurst R · PloS one · 2011
    Randomized trial119 participantsImmunity forSelenium
  70. Effect of selenium on immune response against hepatitis B vaccine with accelerated method in insulin-dependent diabetes mellitus patients.
    Janbakhsh A; Mansouri F; Vaziri S; Sayad B; Afsharian M; Rahimi M; Shahebrahimi K; Salari F · Caspian journal of internal medicine · 2013
    Randomized trial62 participantsImmunity forSelenium
  71. Chemoprevention trial of human hepatitis with selenium supplementation in China.
    Yu SY; Li WG; Zhu YJ; Yu WP; Hou C · Biological trace element research · 1990
    Non-randomized trial20,847 participantsImmunity forSelenium
  72. Selenium nanoparticles as adjunctive therapy in sepsis: A pilot randomized clinical trial.
    Gu WJ; Huang W; Zhao FZ; Yuan XK; Jin K; Chen JL; Zhang CY; Huang Y; He L; Zhuang H; Yin HY; Chen T · Drug resistance updates : reviews and commentaries in antimicrobial and anticancer chemotherapy · 2026
    Randomized trial70 participantsImmunity forSelenium
  73. Selenium supplementation in patients with autoimmune thyroiditis decreases thyroid peroxidase antibodies concentrations.
    Gärtner R; Gasnier BC; Dietrich JW; Krebs B; Angstwurm MW · The Journal of clinical endocrinology and metabolism · 2002
    Randomized trial70 participantsImmunity forSelenium
  74. Depressed immune response to tetanus in children with vitamin A deficiency.
    Semba RD; Muhilal; Scott AL; Natadisastra G; Wirasasmita S; Mele L; Ridwan E; West KP; Sommer A · The Journal of nutrition · 1992
    Randomized trial236 participantsImmunity forVitamin A
  75. Impact of a single megadose of vitamin A at delivery on breastmilk of mothers and morbidity of their infants.
    Roy SK; Islam A; Molla A; Akramuzzaman SM; Jahan F; Fuchs G · European journal of clinical nutrition · 1997
    Randomized trial50 participantsImmunity forVitamin A
  76. Vitamin A supplementation reduces measles morbidity in young African children: a randomized, placebo-controlled, double-blind trial.
    Coutsoudis A; Broughton M; Coovadia HM · The American journal of clinical nutrition · 1991
    Randomized trial60 participantsImmunity forVitamin A
  77. Vitamin A supplementation enhances specific IgG antibody levels and total lymphocyte numbers while improving morbidity in measles.
    Coutsoudis A; Kiepiela P; Coovadia HM; Broughton M · The Pediatric infectious disease journal · 1992
    Randomized trial60 participantsImmunity forVitamin A
  78. Vitamin A supplementation reduces the monocyte chemoattractant protein-1 intestinal immune response of Mexican children.
    Long KZ; Santos JI; Estrada Garcia T; Haas M; Firestone M; Bhagwat J; Dupont HL; Hertzmark E; Rosado JL; Nanthakumar NN · The Journal of nutrition · 2006
    Randomized trial127 participantsImmunity forVitamin A
  79. Vitamin C and contribution to the normal function of the immune system: evaluation of a health claim pursuant to Article 14 of Regulation (EC) No 1924/2006.
    EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA) · EFSA journal. European Food Safety Authority · 2026
    Guideline / consensusImmunity forVitamin C
  80. Therapeutic effects of high-dose vitamin C supplementation in patients with COVID-19: a meta-analysis.
    Sun L; Zhao JH; Fan WY; Feng B; Liu WW; Chen RQ; Ban C; Dang AG; Wang M; Luo KT; Zhou GY; Yu FF; Ba Y · Nutrition reviews · 2024
    Meta-analysis2,334 participants14 studies pooledImmunity forVitamin C
  81. Effect of micronutrient supplements on influenza and other respiratory tract infections among adults: a systematic review and meta-analysis.
    Abioye AI; Bromage S; Fawzi W · BMJ global health · 2021
    Meta-analysisImmunity forVitamin C
  82. New evidence for antioxidant properties of vitamin C.
    Vojdani A; Bazargan M; Vojdani E; Wright J · Cancer detection and prevention · 2001
    Randomized trial20 participantsImmunity forVitamin C
  83. Enhanced Vitamin C Delivery: A Systematic Literature Review Assessing the Efficacy and Safety of Alternative Supplement Forms in Healthy Adults.
    Calder PC; Kreider RB; McKay DL · Nutrients · 2025
    Systematic review13 studies pooledImmunity forVitamin C
  84. Vitamin D supplementation to prevent acute respiratory infections: individual participant data meta-analysis.
    Martineau AR; Jolliffe DA; Greenberg L; Aloia JF; Bergman P; Dubnov-Raz G; Esposito S; Ganmaa D; Ginde AA; Goodall EC; Grant CC; Janssens W; Jensen ME; Kerley CP; Laaksi I; Manaseki-Holland S; Mauger D; Murdoch DR; Neale R; Rees JR; Simpson S; Stelmach I; Trilok Kumar G; Urashima M; Camargo CA; Griffiths CJ; Hooper RL · Health technology assessment (Winchester, England) · 2020
    Meta-analysis11,321 participants25 studies pooledImmunity forVitamin D
  85. Association Between Vitamin D and Influenza: Meta-Analysis and Systematic Review of Randomized Controlled Trials.
    Zhu Z; Zhu X; Gu L; Zhan Y; Chen L; Li X · Frontiers in nutrition · 2022
    Meta-analysis4,859 participants10 studies pooledImmunity forVitamin D
  86. Vitamin D3 and deconvoluting a rash.
    Ernst MK; Evans ST; Techner JM; Rothbaum RM; Christensen LF; Onay UV; Biyashev D; Demczuk MM; Nguyen CV; Honda KS; McCormick TS; Tsoi LC; Gudjonsson JE; Cooper KD; Lu KQ · JCI insight · 2023
    Randomized trial28 participantsImmunity forVitamin D
  87. Effect of vitamin D3 supplementation on cellular immunity and inflammatory markers in COVID-19 patients admitted to the ICU.
    Bychinin MV; Klypa TV; Mandel IA; Yusubalieva GM; Baklaushev VP; Kolyshkina NA; Troitsky AV · Scientific reports · 2022
    Randomized trial110 participantsImmunity forVitamin D
  88. Current opinion on the role of vitamin D supplementation in respiratory infections and asthma/COPD exacerbations: A need to establish publication guidelines for overcoming the unpublished data.
    Anitua E; Tierno R; Alkhraisat MH · Clinical nutrition (Edinburgh, Scotland) · 2022
    Meta-analysis50,554 participants65 studies pooledImmunity forVitamin D
  89. Nutrient supplementation for prevention of viral respiratory tract infections in healthy subjects: A systematic review and meta-analysis.
    Vlieg-Boerstra B; de Jong N; Meyer R; Agostoni C; De Cosmi V; Grimshaw K; Milani GP; Muraro A; Oude Elberink H; Pali-Schöll I; Roduit C; Sasaki M; Skypala I; Sokolowska M; van Splunter M; Untersmayr E; Venter C; O'Mahony L; Nwaru BI · Allergy · 2022
    Meta-analysis199,055 participants115 studies pooledImmunity forZinc
  90. Zinc supplementation reduces the incidence of acute lower respiratory infections in infants and preschool children: a double-blind, controlled trial.
    Sazawal S; Black RE; Jalla S; Mazumdar S; Sinha A; Bhan MK · Pediatrics · 1998
    Randomized trial609 participantsImmunity forZinc
  91. A randomized controlled trial of zinc supplementation in the treatment of acute respiratory tract infection in Thai children.
    Rerksuppaphol S; Rerksuppaphol L · Pediatric reports · 2020
    Randomized trial64 participantsImmunity forZinc
  92. The effect of zinc and vitamin A supplementation on immune response in an older population.
    Fortes C; Forastiere F; Agabiti N; Fano V; Pacifici R; Virgili F; Piras G; Guidi L; Bartoloni C; Tricerri A; Zuccaro P; Ebrahim S; Perucci CA · Journal of the American Geriatrics Society · 1998
    Randomized trial136 participantsImmunity forZinc
  93. The role of specific nutrients in preventing immune system and blood cell disorders: an umbrella review.
    Vecchietti A; Strano P; Minutolo G; Grieco V; Cappuccio G; Granvillano G; Confalonieri L; Briganti GL; Raso E; Chimienti M; Pellegrini M; Mercogliano M; Spatari G; Lugli C; Urbano T; Lorenzon A · Journal of preventive medicine and hygiene · 2026
    Systematic review13 studies pooledImmunity forZinc
  94. Treatment of brittle nail with a hydroxypropyl chitosan-based lacquer, alone or in combination with oral biotin: A randomized, assessor-blinded trial.
    Chiavetta A; Mazzurco S; Secolo MP; Tomarchio G; Milani M · Dermatologic therapy · 2020
    Randomized trial50 participantsNail Health forBiotin
  95. Vitamins and minerals: their role in nail health and disease.
    Scheinfeld N; Dahdah MJ; Scher R · Journal of drugs in dermatology : JDD · 2007
    Narrative reviewNail Health forBiotin Nail Health forZinc
  96. Oral supplementation with specific bioactive collagen peptides improves nail growth and reduces symptoms of brittle nails.
    Hexsel D; Zague V; Schunck M; Siega C; Camozzato FO; Oesser S · Journal of cosmetic dermatology · 2018
    Single-arm trial25 participantsNail Health forCollagen
  97. Influence of collagen peptide supplementation on visible signs of skin and nail health and -aging in an East Asian population: A double blind, randomized, placebo-controlled trial.
    Vleminckx S; Virgilio N; Asserin J; Prawitt J; Silva CIF · Journal of cosmetic dermatology · 2024
    Randomized trial85 participantsNail Health forCollagen
  98. Nail Supplements: When, How, and Why?
    Zaraa I; Richert B · Skin appendage disorders · 2026
    Narrative reviewNail Health forCollagen Nail Health forSilicon
  99. Expanding the COL7A1 mutation database: novel and recurrent mutations and unusual genotype-phenotype constellations in 41 patients with dystrophic epidermolysis bullosa.
    Kern JS; Kohlhase J; Bruckner-Tuderman L; Has C · The Journal of investigative dermatology · 2006
    Observational study41 participantsNail Health forCollagen
  100. Vitamin C Deficiency in Inflammatory Bowel Disease: The Forgotten Micronutrient.
    Dunleavy KA; Ungaro RC; Manning L; Gold S; Novak J; Colombel JF · Crohn's & colitis 360 · 2023
    Other20 participantsNail Health forVitamin C
  101. Effect of Two Different Doses of Vitamin D Supplementation on Metabolic Profiles of Insulin-Resistant Patients with Polycystic Ovary Syndrome.
    Jamilian M; Foroozanfard F; Rahmani E; Talebi M; Bahmani F; Asemi Z · Nutrients · 2018
    Randomized trial90 participantsTestosterone Support forVitamin D
  102. Androgens and hirsutism score of overweight women with polycystic ovary syndrome improved after vitamin D treatment: A randomized placebo controlled clinical trial.
    Al-Bayyari N; Al-Domi H; Zayed F; Hailat R; Eaton A · Clinical nutrition (Edinburgh, Scotland) · 2021
    Randomized trial60 participantsTestosterone Support forVitamin D
  103. Association between plasma 25-OH vitamin D and testosterone levels in men.
    Nimptsch K; Platz EA; Willett WC; Giovannucci E · Clinical endocrinology · 2012
    Case-control study1,362 participantsTestosterone Support forVitamin D
  104. Causal Link Between Vitamin D and Total Testosterone in Men: A Mendelian Randomization Analysis.
    Chen C; Zhai H; Cheng J; Weng P; Chen Y; Li Q; Wang C; Xia F; Wang N; Lu Y · The Journal of clinical endocrinology and metabolism · 2020
    Other4,254 participantsTestosterone Support forVitamin D
  105. Associations of vitamin D status and vitamin D-related polymorphisms with sex hormones in older men.
    Rafiq R; van Schoor NM; Sohl E; Zillikens MC; Oosterwerff MM; Schaap L; Lips P; de Jongh RT · The Journal of steroid biochemistry and molecular biology · 2017
    Cohort study643 participantsTestosterone Support forVitamin D
  106. Environmental exposure to metals and male reproductive hormones: circulating testosterone is inversely associated with blood molybdenum.
    Meeker JD; Rossano MG; Protas B; Padmanahban V; Diamond MP; Puscheck E; Daly D; Paneth N; Wirth JJ · Fertility and sterility · 2010
    Cross-sectional study219 participantsTestosterone Support forZinc
  107. Nonpharmacological Interventions for the Management of Testosterone and Sperm Parameters: A Scoping Review.
    Santos HO; Cadegiani FA; Forbes SC · Clinical therapeutics · 2022
    Scoping reviewTestosterone Support forZinc
  108. Zinc is an Essential Element for Male Fertility: A Review of Zn Roles in Men's Health, Germination, Sperm Quality, and Fertilization.
    Fallah A; Mohammad-Hasani A; Colagar AH · Journal of reproduction & infertility · 2020
    Narrative reviewTestosterone Support forZinc
  109. Clinical, endocrinological and biochemical effects of zinc deficiency.
    Prasad AS · Clinics in endocrinology and metabolism · 1986
    Narrative reviewTestosterone Support forZinc
  110. Clinical, endocrinologic, and biochemical effects of zinc deficiency.
    Prasad AS · Special topics in endocrinology and metabolism · 1986
    Narrative reviewTestosterone Support forZinc