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Longer Stronger Hair and Nails

Irwin Naturals
4.5
★ ★ ★ ★ ★
(1663 ratings)
Manganese 5 mg
Biotin 2600 mcg
Copper 1 mg
Proline 80 mg
Horsetail 160 mg
Product Image
Score75
Concentrated biotin, horsetail, zinc picolinate, copper, vitamin C, and lysine directly address growth, mineral status, silica-related structure, collagen support, and amino acid supply. Lysine and proline are modest and horsetail potency is uncertain, while the concentrated biotin may interfere with some laboratory tests.
How scoring works
Quantity:120 Softgel(s) • (60 servings)
Goals:
Nail Health
Hair Health
Skin Health
Bone Health

Score 75

Concentrated biotin, horsetail, zinc picolinate, copper, vitamin C, and lysine directly address growth, mineral status, silica-related structure, collagen support, and amino acid supply. Lysine and proline are modest and horsetail potency is uncertain, while the concentrated biotin may interfere with some laboratory tests.
How scoring works

Also available as

1 option
60 servings 2 Liquid Softgel(s) • 60 Softgel(s) • 30 servings $19.99 ($0.66 per serving)
$34.99($0.58 per serving)
iHerb
$ 34.99
Amazon
$ 34.99
Vitacost
$ 37.67
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Analysis

Concentrated biotin, horsetail, zinc picolinate, copper, vitamin C, and lysine directly address growth, mineral status, silica-related structure, collagen support, and amino acid supply. Horsetail lacks silica standardization and lysine is modest, so the structural contribution is less certain than the label breadth suggests.

Concentrated biotin, vitamin C, zinc picolinate, chelated copper, flax oil, horsetail, and gotu kola provide a coherent hair-and-nail formula with several useful forms. Lysine and proline are modest and horsetail potency is uncertain, while the concentrated biotin may interfere with some laboratory tests.

Manganese, Copper, Proline, and Horsetail offer only a limited connection to focused bone health. Some relevant amounts are useful, while others are better suited to maintenance.

Who is it for
  • Adults seeking Nail Health support
  • People comfortable with a multi-ingredient softgel formula
  • Users who can review the ingredient list against medicines and existing supplements
Best for
  • Nail Health
  • Hair Health
  • Skin Health

Pros

  • Concentrated biotin, horsetail, zinc picolinate, copper, vitamin C, and lysine directly address growth, mineral status, silica-related structure, collagen support, and amino acid supply
  • Strongest formulation fit is Nail Health
  • Main label amounts are disclosed for Citrus Fruit Extract, Vitamin C, Biotin
  • Includes a meaningful Manganese component

Cons

  • modest and horsetail potency is uncertain, while the concentrated biotin may interfere with some laboratory tests
  • Weak fit for Bone Health
  • Several secondary ingredients add breadth without equally strong dose or form support
  • Long ingredient list makes the combined effects and trade-offs harder to predict

Warnings

  • Lysine and proline are modest and horsetail potency is uncertain, while the concentrated biotin may interfere with some laboratory tests.

Nutrient quality

75 High impact

Useful mineral forms, buffered vitamin C, and structural ingredients fit hair and nail support. Modest amino acids and concentrated biotin keep dosing from being fully balanced.

.

Ingredient transparency

80 Highest impact

Most active ingredients and their amounts are clearly listed. Daily directions, a complete excipient panel, and some form details are missing from the supplied data.

.

Customer satisfaction

65 High impact

The aggregate rating is favorable and supported by solid feedback volume. Complaint-level experiences are unavailable, so repeated drawbacks and purpose fit remain uncertain.

.

Value for money

77 High impact

The serving cost is reasonable for the documented core ingredients. Form, disclosure, or focus limitations keep category value from standing out.

.
Report analysis

Goals

Nail Health
Nail Health
Impact
High effect
B+ Goal FitB- Strength of SupportB CoverageB+ Formula Quality
Biotin · 2600 mcgHorsetail · 160 mg

Concentrated biotin, horsetail, zinc picolinate, copper, vitamin C, and lysine directly address growth, mineral status, silica-related structure, collagen support, and amino acid supply. Horsetail lacks silica standardization and lysine is modest, so the structural contribution is less certain than the label breadth suggests.

The formula is well targeted and pairs zinc with copper and vitamin C with lysine. Concentrated biotin can affect some laboratory tests, so use should be disclosed before blood work.

Study evidence
Biotin Supportive 8 studies
Horsetail Not classified

No linked studies yet.

Vitamin C Supportive 1 study
Zinc No effect 1 study
Hair Health
Hair Health
Impact
High effect
B+ Goal FitC+ Strength of SupportB CoverageB+ Formula Quality
Biotin · 2600 mcgZinc · 10 mgLysine · 80 mgVitamin C · 200 mg

Concentrated biotin, zinc, vitamin C, horsetail, lysine, and proline create a clearly hair-focused combination. The formula covers keratin cofactors, structural amino acids, and possible silica support.

Biotin and zinc are the strongest components, while lysine and proline are much too small for focused amino-acid support and horsetail lacks silica standardization. The concentrated biotin may affect some blood tests, so use should be disclosed before testing.

Study evidence
Biotin Supportive 4 studies
Horsetail Not classified

No linked studies yet.

Lysine Supportive 1 study
Vitamin C Mixed 5 studies
Zinc Supportive 22 studies
Skin Health
Skin Health
Impact
Moderate effect
C+ Goal FitC Strength of SupportC CoverageC+ Formula Quality
Zinc · 10 mgVitamin C · 200 mgCopper · 1 mgProline · 80 mg

Vitamin C, proline, lysine, zinc, copper, and horsetail provide building blocks and cofactors related to skin structure. Vitamin C and zinc are useful, while proline and lysine are limited to 80 mg each.

The formula supports collagen synthesis, trace-mineral repair, and some botanical structural support. Several pathways are touched, but no collagen or substantial amino-acid dose provides structural depth.

Study evidence
Copper Supportive 16 studies
Proline Disputed 4 studies
Vitamin C Supportive 53 studies
Zinc Supportive 66 studies
Bone Health
Bone Health
Impact
Moderate effect
C- Goal FitC+ Strength of SupportC CoverageD Formula Quality
Calcium · 30 mgCopper · 1 mgManganese · 5 mgLysine · 80 mgZinc · 10 mgProline · 80 mgVitamin C · 200 mg

Manganese, Copper, Proline, and Horsetail offer only a limited connection to focused bone health. Some relevant amounts are useful, while others are better suited to maintenance.

Coverage reaches structural minerals and bone-matrix support. The wider formula is aimed at another use, so several ingredients add little skeletal value.

Study evidence
Copper Disputed 20 studies
Horsetail Not classified

No linked studies yet.

Manganese Adverse 12 studies
Proline Disputed 2 studies

Ingredients

IngredientAmount per serving
Calories
20 Calorie(s)
Total Fat
1 Gram(s)
Protein
1 Gram(s)
Vitamin C (Calcium Ascorbate)
 200 mg
Biotin
2600 mcg
Calcium
30 mg
Zinc (Zinc Picolinate)
 10 mg
Copper (Copper Amino Acid Chelate)
 1 mg
Manganese (Manganese Citrate)
 5 mg
Flaxseed Oil
1058 mg
Gotu Kola herb extract
180 mg
Horsetail Herb Extract
160 mg
Citrus Fruit Extract
100 mg
Lysine (Lysine Hydrochloride)
 80 mg
Proline
80 mg
BioPerine Complex
12 mg
Adults 18–50 Women
Report overview
Manganese (Manganese Citrate) · 5 mg OverallScore82
B+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyD+ Value

Manganese citrate is an organic complex with useful absorption potential. The 5 mg elemental serving falls within the effective range without exceeding the upper intake limit. The elemental amount is clearly disclosed, though the serving cost limits value.

View ingredientView products
Biotin · 2600 mcg OverallScore78
B+ Active Ingredient Quality & BioavailabilityB+ Dose, Safety & Label TransparencyC Value

The biotin amount is well aligned with focused hair and nail support, while the liquid softgel provides a favorable delivery format. The active d-isomer is not confirmed on the label. The concentrated amount may affect some lab results, so disclose use before blood testing.

View ingredientView products
Copper (Copper Amino Acid Chelate) · 1 mg OverallScore73
B- Active Ingredient Quality & BioavailabilityA- Dose, Safety & Label TransparencyD+ Value

generic copper amino acid chelate provides acceptable form quality with some limitations. The elemental amount suits daily maintenance and remains comfortably safe. Its zinc-to-copper balance is well aligned, while serving value is reasonable for the wider formula.

View ingredientView products
Loading alternative details
91 Performance

Vegan Hair Skin & Nails

NOW Solutions
<p>Chelated minerals, structural amino acids, hyaluronic acid, and antioxidant vitamins form a coherent hair, skin, and nail formula with strong serving value. High biotin and horsetail without silica standardization remain important limitations.</p>
86 Performance

Keratin Hair Booster

Reserveage Nutrition
<p>A meaningful keratin amount and high biotin directly target hair and nail structure more strongly than the original’s modest amino acids. Zinc oxide, copper sulfate, and a hidden longevity blend reduce form quality and value.</p>
75 Performance

Collagenics

Metagenics
<p>Vitamin C, minerals, proline, cystine, lysine, MSM, and a well-specified horsetail extract create broad collagen-oriented support. Most structural amino acids are modest, vitamin B6 is high for long-term use, and serving cost is premium.</p>
79 Budget

Silica Complex

NOW
<p>A substantial horsetail extract with calcium, zinc, manganese, and boron provides focused hair and nail support at a much lower serving cost. Missing horsetail species and silica yield limit confidence in its main active.</p>
82 Budget

Hair Skin & Nails

Nature Made
<p>Biotin, beta-carotene, vitamin C, zinc, and copper create a concise beauty formula at a much lower serving cost. Oxide minerals weaken absorption quality, and high biotin can interfere with laboratory tests.</p>
67 Budget

Mini-Multi

Carlson
<p>The one-daily formula offers broad vitamin coverage and excellent serving value. It is less hair-focused than the original, while calcium and magnesium are too small for meaningful structural support.</p>
84 Value

Longer Stronger Hair and Nails

Irwin Naturals
<p>Buffered vitamin C, useful mineral forms, biotin, horsetail, amino acids, and flax oil preserve the same targeted approach with slightly different package value. Lysine and proline remain modest, horsetail lacks full silica detail, and concentrated biotin can affect laboratory tests.</p>
71 Value

Hair Volume Gummies Apple Flavor

New Nordic
<p>Biotin, horsetail, apple, millet, and zinc provide convenient hair-focused support at similar or better serving economics. Zinc is token sized and the botanicals lack active-marker or silica standardization.</p>
65 Value

Mini-Multi

Carlson
<p>A broad one-daily vitamin profile offers excellent serving value and several useful forms. It lacks the original’s focused amino acids and horsetail, while calcium and magnesium remain too small for structural support.</p>
Report alternatives

Sources

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

  1. The Manganese-Bone Connection: Investigating the Role of Manganese in Bone Health.
    Taskozhina G; Batyrova G; Umarova G; Issanguzhina Z; Kereyeva N · Journal of clinical medicine · 2024
    Narrative reviewBone Health forManganese
  2. Relationship between blood manganese and bone mineral density and bone mineral content in adults: A population-based cross-sectional study.
    Wang C; Zhu Y; Long H; Ou M; Zhao S · PloS one · 2022
    Cross-sectional study9,732 participantsBone Health forManganese
  3. Correlation between bone mineral density and serum trace element contents of elderly males in Beijing urban area.
    Wang L; Yu H; Yang G; Zhang Y; Wang W; Su T; Ma W; Yang F; Chen L; He L; Ma Y; Zhang Y · International journal of clinical and experimental medicine · 2016
    Cross-sectional study91 participantsBone Health forManganese
  4. Associations of dietary copper intake with total bone mineral density and lumbar spine bone mineral density in American adults.
    Hu M; Wang Z; Li C; Zheng Y; Hu J · Medicine · 2025
    Cross-sectional studyBone Health forCopper
  5. The Association between Dietary and Circulating Copper Levels and Osteoporosis: a Scoping Review.
    Ju Y; Xiong W; Pang Y; Chen Z; Hou J; Zheng S; Li Z; Liu T; Xia H; Xia M; Zhong Y; Li J; Jiang X · Biological trace element research · 2026
    Scoping review18 studies pooledBone Health forCopper
  6. Serum copper levels are associated with bone mineral density and total fracture.
    Qu X; He Z; Qiao H; Zhai Z; Mao Z; Yu Z; Dai K · Journal of orthopaedic translation · 2022
    Cross-sectional study722 participantsBone Health forCopper
  7. Human bone collagen synthesis is a rapid, nutritionally modulated process.
    Babraj JA; Smith K; Cuthbertson DJ; Rickhuss P; Dorling JS; Rennie MJ · Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research · 2005
    Methods validation study8 participantsBone Health forProline
  8. Osteogenesis imperfecta: recent findings shed new light on this once well-understood condition.
    Basel D; Steiner RD · Genetics in medicine : official journal of the American College of Medical Genetics · 2009
    Narrative reviewBone Health forProline
  9. 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 participantsHair Health Nail Health forBiotin
  10. 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
  11. 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
  12. Trace element levels in alopecia areata.
    Bhat YJ; Manzoor S; Khan AR; Qayoom S · Indian journal of dermatology, venereology and leprology · 2009
    Case-control study100 participantsHair Health forCopper
  13. Menkes disease and response to copper histidine: An Indian case series.
    Yoganathan S; Sudhakar SV; Arunachal G; Thomas M; Subramanian A; George R; Danda S · Annals of Indian Academy of Neurology · 2022
    Case series4 participantsHair Health forCopper
  14. UV damage to hair and the effect of antioxidants and metal chelators.
    Millington KR; Marsh JM · International journal of cosmetic science · 2021
    In vitro / ex vivo studyHair Health forCopper
  15. 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
  16. 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
  17. Brittle nails: response to daily biotin supplementation.
    Hochman LG; Scher RK; Meyerson MS · Cutis · 1993
    Case series35 participantsNail Health forBiotin
  18. Association between dietary copper, iron, zinc, selenium intake and osteopenia or osteoporosis in elderly hypertensive patients: a retrospective cohort study.
    Chen M; Jia L; Gao R · Frontiers in nutrition · 2024
    Cohort study5,286 participantsBone Health forCopper
  19. The association between dietary mineral intake and bone mineral density: a cross-sectional study.
    Wei M; Wei J; Huang S · Journal of health, population, and nutrition · 2025
    Cross-sectional study11,520 participantsBone Health forCopper
  20. Association between dietary copper intake and bone mineral density in children and adolescents aged 8-19 years: A cross-sectional study.
    Cui A; Yan J; Li H; Fan Z; Wei X; Wang H; Zhuang Y · PloS one · 2024
    Cross-sectional study6,965 participantsBone Health forCopper
  21. Risk of Environmental Chemicals on Bone Fractures Is Independent of Low Bone Mass in US Adults: Insights from 2017 to 2018 NHANES.
    Ling R; Ai Y; Chen C; Zhang J; Zou Z; Cheng S; Li C; Li X; Wang B · Metabolites · 2023
    Cross-sectional study2,640 participantsBone Health forManganese
  22. Associations of multiple metals with bone mineral density: A population-based study in US adults.
    Wei MH; Cui Y; Zhou HL; Song WJ; Di DS; Zhang RY; Huang Q; Liu JA; Wang Q · Chemosphere · 2021
    Cross-sectional studyBone Health forManganese
  23. Sex-specific associations of urinary mixed-metal concentrations with femoral bone mineral density among older people: an NHANES (2017-2020) analysis.
    Li H; Li G; Yi M; Zhou J; Deng Y; Huang Y; He S; Meng X; Liu L · Frontiers in public health · 2024
    Cross-sectional study31 participantsBone Health forManganese
  24. 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
  25. Causes of hair loss and the developments in hair rejuvenation.
    Rushton DH; Norris MJ; Dover R; Busuttil N · International journal of cosmetic science · 2010
    Narrative reviewHair Health forLysine
  26. Management of hair loss associated with endocrine therapy in patients with breast cancer: an overview.
    Karatas F; Sahin S; Sever AR; Altundag K · SpringerPlus · 2016
    Narrative reviewHair Health forVitamin C
  27. Elucidating causal relationships of diet-derived circulating antioxidants and the risk of non-scarring alopecia: A Mendelian randomization study.
    Ba Y; Shen L; Peng X; Zhang Y; Wang J · Medicine · 2024
    Methods validation study201,019 participantsHair Health forVitamin C
  28. Alterations of plasma antioxidants and mitochondrial DNA mutation in hair follicles of smokers.
    Liu CS; Chen HW; Lii CK; Tsai CS; Kuo CL; Wei YH · Environmental and molecular mutagenesis · 2002
    Observational studyHair Health forVitamin C
  29. Removal of synthetic hair dye using formamidine sulfinic acid and other sulfinate precursors.
    Hawkes JA; Lewis DM; Mama J; Murray J · International journal of cosmetic science · 2026
    Methods validation studyHair Health forVitamin C
  30. A Zinc Sulphate-Resistant Acrodermatitis Enteropathica Patient with a Novel Mutation in SLC39A4 Gene.
    Kilic M; Taskesen M; Coskun T; Gürakan F; Tokatli A; Sivri HS; Dursun A; Schmitt S; Küry S · JIMD reports · 2013
    Case reportHair Health forVitamin C
  31. 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
  32. 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
  33. 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
  34. 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
  35. 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
  36. 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
  37. 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
  38. 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
  39. Noninferiority of Copper Dressings Than Negative Pressure Wound Therapy in Healing Diabetic Wounds: A Randomized Clinical Trial.
    Melamed E; Dabbah J; Israel T; Kan I; Pinzur MS; Roth T; Borkow G · Advances in wound care · 2026
    Randomized trialSkin Health forCopper
  40. Improvement of facial skin characteristics using copper oxide containing pillowcases: a double-blind, placebo-controlled, parallel, randomized study.
    Borkow G; Gabbay J; Lyakhovitsky A; Huszar M · International journal of cosmetic science · 2010
    Randomized trial57 participantsSkin Health forCopper
  41. Radially Electrospun Fibrous Membrane Incorporated with Copper Peroxide Nanodots Capable of Self-Catalyzed Chemodynamic Therapy for Angiogenesis and Healing Acceleration of Diabetic Wounds.
    Huang Y; Qi L; Liu Z; Jiang Y; Wang J; Liu L; Li Y; Zhang L; Feng G · ACS applied materials & interfaces · 2023
    Animal experimentSkin Health forCopper
  42. Engineering copper nanoparticle/polysaccharide-immobilized cotton gauze for accelerated healing of Staphylococcus aureus-infected dermal wounds.
    Sahoo M; Banerjee T; Virkar S; Das S; Biswas S; Mitra D · Journal of materials chemistry. B · 2026
    Animal experimentSkin Health forCopper
  43. Stimulation of Healing of Non-Infected Stagnated Diabetic Wounds by Copper Oxide-Impregnated Wound Dressings.
    Melamed E; Rovitsky A; Roth T; Assa L; Borkow G · Medicina (Kaunas, Lithuania) · 2021
    Single-arm trialSkin Health forCopper
  44. Improvement of crow's feet lines by topical application of 1-carbamimidoyl-L-proline (CLP).
    Kawashima M; Yokose U; Hachiya A; Fujimura T; Tsukahara K; Kawada H; Kitahara T; Takema Y; Terui T; Nakagawa H · European journal of dermatology : EJD · 2014
    Randomized trial126 participantsSkin Health forProline
  45. Collagen synthesis in human musculoskeletal tissues and skin.
    Babraj JA; Cuthbertson DJ; Smith K; Langberg H; Miller B; Krogsgaard MR; Kjaer M; Rennie MJ · American journal of physiology. Endocrinology and metabolism · 2005
    Methods validation studySkin Health forProline
  46. Genotype-phenotype spectrum of PYCR1-related autosomal recessive cutis laxa.
    Dimopoulou A; Fischer B; Gardeitchik T; Schröter P; Kayserili H; Schlack C; Li Y; Brum JM; Barisic I; Castori M; Spaich C; Fletcher E; Mahayri Z; Bhat M; Girisha KM; Lachlan K; Johnson D; Phadke S; Gupta N; Simandlova M; Kabra M; David A; Nijtmans L; Chitayat D; Tuysuz B; Brancati F; Mundlos S; Van Maldergem L; Morava E; Wollnik B; Kornak U · Molecular genetics and metabolism · 2014
    Case series33 participantsSkin Health forProline
  47. Collagen structure in skin from fibromyalgia patients.
    Ribel-Madsen S; Gronemann ST; Bartels EM; Danneskiold-Samsøe B; Bliddal H · International journal of tissue reactions · 2006
    Case-control study35 participantsSkin Health forProline
  48. Evaluation of the anti-wrinkle effect of an ascorbic acid-loaded dissolving microneedle patch via a double-blind, placebo-controlled clinical study.
    Lee C; Yang H; Kim S; Kim M; Kang H; Kim N; An S; Koh J; Jung H · International journal of cosmetic science · 2017
    Randomized trial23 participantsSkin Health forVitamin C
  49. Comparative Study on the Outcome of Periorbital Wrinkles Treated with Laser-Assisted Delivery of Vitamin C or Vitamin C Plus Growth Factors: A Randomized, Double-blind, Clinical Trial.
    Machado BHB; Frame J; Zhang J; Najlah M · Aesthetic plastic surgery · 2021
    Randomized trial149 participantsSkin Health forVitamin C
  50. Randomized trial of topical ascorbic acid in DMSO versus imiquimod for the treatment of basal cell carcinoma.
    Burke B; Bailie JE · Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie · 2022
    Randomized trial25 participantsSkin Health forVitamin C
  51. Vitamin C improves healing of foot ulcers: a randomised, double-blind, placebo-controlled trial.
    Gunton JE; Girgis CM; Lau T; Vicaretti M; Begg L; Flood V · The British journal of nutrition · 2022
    Randomized trial16 participantsSkin Health forVitamin C
  52. Dietary nutrient intakes and skin-aging appearance among middle-aged American women.
    Cosgrove MC; Franco OH; Granger SP; Murray PG; Mayes AE · The American journal of clinical nutrition · 2007
    Cross-sectional study4,025 participantsSkin Health forVitamin C
  53. Sex-related differences in response to zinc pyrithione shampoo vs. non-anti-dandruff shampoo.
    Collins LZ; Baines FL; Matheson JR; Turner GA; Diao Y; Li Y; Pi Y · International journal of cosmetic science · 2019
    Meta-analysis2,088 participants20 studies pooledSkin Health forZinc
  54. Maintenance of an Acidic Skin Surface with a Novel Zinc Lactobionate Emollient Preparation Improves Skin Barrier Function in Patients with Atopic Dermatitis.
    Andrew PV; Pinnock A; Poyner A; Brown K; Chittock J; Kay LJ; Cork MJ; Danby SG · Dermatology and therapy · 2024
    Cohort study23 participantsSkin Health forZinc
  55. Spatial expression of metallothionein, matrix metalloproteinase-1 and Ki-67 in human epidermal wounds treated with zinc and determined by quantitative immunohistochemistry: A randomised double-blind trial.
    Ågren MS; Chafranska L; Eriksen JO; Forman JL; Bjerrum MJ; Schjerling P; Larsen HF; Cottarelli E; Jorgensen LN; Gjerdrum LMR · European journal of cell biology · 2021
    Randomized trial30 participantsSkin Health forZinc
  56. A pilot trial using topical regular crystalline insulin vs. aqueous zinc solution for uncomplicated cutaneous wound healing: Impact on quality of life.
    Attia EA; Belal DM; El Samahy MH; El Hamamsy MH · Wound repair and regeneration : official publication of the Wound Healing Society [and] the European Tissue Repair Society · 2014
    Randomized trial90 participantsSkin Health forZinc
  57. Evidence-Based Nutritional Interventions in Wound Care.
    Saeg F; Orazi R; Bowers GM; Janis JE · Plastic and reconstructive surgery · 2021
    Systematic review2,339 participants36 studies pooledSkin Health forZinc