Product Image

Respir-All

NOW
4.7
★ ★ ★ ★ ★
(578 ratings)
Vitamin C 500 mg
Vitamin B5 100 mg
Vitamin B6 20 mg
Stinging Nettle 500 mg
Bromelain 435 mg
Product Image
Score79
A well-dosed quercetin-centered respiratory blend, but licorice, high vitamin B6, and incomplete potency details complicate long-term use.
How scoring works
Quantity:60 Tablet(s) • (20 servings)
Goals:
Immunity
General Health
Anti-Inflammatory Support
Skin Health

Score 79

A well-dosed quercetin-centered respiratory blend, but licorice, high vitamin B6, and incomplete potency details complicate long-term use.
How scoring works
$15.03($0.75 per serving)
iHerb
$ 15.03
Vitacost
$ 16.89
Daily Vita
$ 17.40
Pure Formulas
$ 17.85
Report prices

Analysis

A large quercetin amount anchors the formula, while vitamin C, bromelain, nettle, and zinc add complementary antioxidant and immune support. Magnesium ascorbate and zinc monomethionine are thoughtful nutrient forms.

Bromelain lacks enzyme activity units, and the nettle and licorice extracts are not standardized. The three-tablet serving also includes more vitamin B6 than is needed for the formula’s main purpose.

The blend is best suited to adults seeking a broad seasonal respiratory formula rather than a general multinutrient product. Medicine interactions and long-term vitamin B6 exposure deserve consideration before routine use.

Who is it for
  • Adults seeking seasonal respiratory support
  • People who want quercetin with bromelain and vitamin C
Best for
  • Broad antioxidant and immune support
  • Shorter-term seasonal use

Pros

  • Large quercetin amount
  • Meaningful bromelain and nettle weights
  • Useful vitamin C and zinc forms

Cons

  • Bromelain activity is undisclosed
  • Botanical extracts lack standardization
  • Three-tablet serving is less convenient

Warnings

  • Long-term intake of 20 mg vitamin B6 may contribute to tingling or nerve symptoms in susceptible users.
  • Licorice may raise blood pressure or lower potassium, especially with diuretics, corticosteroids, kidney disease, or hypertension.
  • Bromelain may increase bleeding tendency with anticoagulant or antiplatelet medicines.

Nutrient quality

84 Highest impact

Buffered vitamin C, a well-regarded zinc form, quercetin, nettle, and bromelain provide meaningful support. A relatively high vitamin B6 amount and unspecified botanical strengths reduce balance.

Ingredient transparency

84 Highest impact

All active ingredients have stated amounts and no blend hides their doses. Botanical standardization, non-active ingredients, and complete usage directions are not supplied.

Customer satisfaction

69 High impact

The average rating is strong, with a large review count supporting the signal. No detailed reviews are supplied to assess recurring complaints or experiences tied to the intended use.

Value for money

77 High impact

Substantial quercetin, nettle, and bromelain amounts provide useful formula value. The limited supply and multi-tablet serving temper its competitiveness.

Report analysis

Goals

Immunity
Immunity
Impact
Highest effect
B+ Goal FitB+ Strength of SupportA- CoverageB+ Formula Quality
Magnesium · 40 mgVitamin C · 500 mgZinc · 10 mg

Vitamin C, zinc, quercetin, nettle, bromelain, and licorice address antioxidant defenses and several respiratory-support pathways. Most active amounts are substantial and clearly stated.

Bromelain activity is missing, and zinc falls slightly below the preferred immune benchmark. Licorice may raise blood pressure or lower potassium in susceptible users, making regular use unsuitable for some people.

Study evidence
Bromelain Not classified 1 study
Magnesium Supportive 8 studies
Vitamin C Supportive 53 studies
Zinc Supportive 73 studies
General Health
General Health
Impact
High effect
B- Goal FitB+ Strength of SupportB CoverageB+ Formula Quality
Magnesium · 40 mgZinc · 10 mgVitamin C · 500 mg

Vitamin C, zinc, quercetin, nettle, and bromelain provide meaningful antioxidant and respiratory-support coverage. The active amounts are mostly disclosed and several sit in useful ranges.

The design is more specialized for respiratory and allergy-related needs than daily comprehensive wellness. Licorice root may raise blood pressure or lower potassium, making the formula unsuitable for some people with hypertension or related medication use.

Study evidence
Bromelain Supportive 11 studies
Vitamin C Supportive 56 studies
Zinc Supportive 60 studies
Anti-Inflammatory Support
Anti-Inflammatory Support
Impact
High effect
B+ Goal FitC+ Strength of SupportB+ CoverageB Formula Quality
Vitamin C · 500 mg

Quercetin, nettle, bromelain, and licorice address several inflammatory and allergy-related pathways. The ingredients have credible mechanistic support, though human evidence and effects vary across the blend.

Quercetin and nettle are substantial, while bromelain lacks the activity units needed to confirm potency. Amounts are disclosed, but botanical standardization and bromelain enzyme activity are missing.

Study evidence
Bromelain Supportive 12 studies
Stinging Nettle Supportive 5 studies
Skin Health
Skin Health
Impact
High effect
C+ Goal FitA- Strength of SupportC+ CoverageB- Formula Quality
Zinc · 10 mgVitamin C · 500 mg

Buffered vitamin C and a substantial quercetin amount provide antioxidant support relevant to skin resilience. Zinc adds a useful cofactor for normal repair.

The blend is designed for respiratory support and lacks collagen, ceramides, or a direct hydration active. Licorice may raise blood pressure or lower potassium, especially with diuretics, digoxin, or blood-pressure medicines.

Study evidence
Vitamin C Supportive 53 studies
Zinc Supportive 66 studies
Vision Support
Macular and Blue Light Defense
Vision Support
Impact
Moderate effect
C Goal FitB Strength of SupportC- CoverageD Formula Quality
Zinc · 10 mgVitamin C · 500 mg

Vitamin C, zinc, and quercetin provide several antioxidant and nutrient links to eye health. The formula lacks macular carotenoids, vitamin E, copper, and structural lipids.

Buffered vitamin C and branded zinc are strengths, while the remaining botanicals target respiratory concerns. Licorice may raise blood pressure in susceptible users, which matters with regular use.

Study evidence
Vitamin C Disputed 24 studies
Zinc Supportive 39 studies
Digestive Health
Digestive Health
Impact
Moderate effect
C Goal FitC+ Strength of SupportC- CoverageF Formula Quality
Zinc · 10 mgBromelain · 435 mgMagnesium · 40 mg

Bromelain can help digest protein when taken with meals, and licorice may offer some mucosal support. The formula is designed for respiratory and allergy support, so most actives do not target digestive function.

Bromelain has a useful weight but no activity units or meal-timing guidance. Licorice extract is not identified as DGL and may raise blood pressure or lower potassium with prolonged use in susceptible people.

Study evidence
Bromelain Supportive 2 studies

Ingredients

IngredientAmount per serving
Vitamin C (Magnesium Ascorbate)
 500 mg
Vitamin B6 (Pyridoxine Hydrochloride)
 20 mg
Pantothenic Acid (Calcium Pantothenate)
 100 mg
Calcium (Calcium Carbonate, Calcium Pantothenate)
 85 mg
Magnesium (Magnesium Ascorbate)
 40 mg
Zinc (L-OptiZinc Monomethionine)
 10 mg
Quercetin (Quercetin Dihydrate)
 800 mg
Nettle extract
500 mg
Bromelain
435 mg
Licorice root extract
200 mg
Gluten Free Adults 18–50 Vegan Kosher Dairy Free Vegetarian
Report overview
Vitamin C (Magnesium Ascorbate) · 500 mg OverallScore73
B+ Active Ingredient Quality & BioavailabilityA Dose, Safety & Label TransparencyF Value

Buffered magnesium ascorbate provides a stomach-friendly Vitamin C amount. Quercetin, nettle, bromelain, and licorice make the formula broader and less focused than a dedicated Vitamin C supplement. Cost efficiency is weak for the Vitamin C delivered, and licorice may be unsuitable for people with uncontrolled high blood pressure.

View ingredientView products
Vitamin B5 (Calcium Pantothenate) · 100 mg OverallScore66
B Active Ingredient Quality & BioavailabilityB Dose, Safety & Label TransparencyF Value

Calcium pantothenate supplies a useful maintenance-level amount with clear source disclosure. The broader formula is costly for the vitamin B5 delivered. Licorice extract may raise blood pressure or lower potassium, especially for people using diuretics, digoxin, or blood-pressure medicines.

View ingredientView products
Vitamin B6 (Pyridoxine Hydrochloride) · 20 mg OverallScore62
D+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyF Value

Synthetic pyridoxine is less direct than active P-5-P. The B6 dose is well aligned with targeted metabolic and neurological support. No listed additives create a clear purity concern.

View ingredientView products
Loading alternative details
79 Performance

Activated Quercetin

Source Naturals
<p>Substantial quercetin, buffered magnesium ascorbate, and bromelain create a concise formula with strong immune and anti-inflammatory alignment. Bromelain activity is not stated and the serving cost is higher, but the active weights are easy to understand.</p>
70 Performance

Aller-All

Protocol For Life Balance
<p>Substantial quercetin, bromelain, nettle, vitamin C, and a well-chosen zinc form deepen the same allergy-oriented ingredient pattern. Missing activity details and licorice-related blood-pressure concerns temper the otherwise close fit.</p>
70 Performance

Breathe-X Allergy & Sinus Support

LifeSeasons
<p>High-dose quercetin, vitamin C, bromelain, bioflavonoids, nettle, and astragalus provide broad allergy and sinus coverage. Missing bromelain activity, magnesium oxide, and a higher serving cost keep the stronger ingredient breadth from being an unqualified upgrade.</p>
78 Budget

Quercetin Bromelain

ForestLeaf
<p>A lower serving cost still provides meaningful quercetin, vitamin C, nettle, and bromelain in a coherent formula. Nettle plant part and bromelain activity are not disclosed, but the blend retains closer seasonal-support coverage than many budget candidates.</p>
70 Budget

Sinuplex

Metagenics
<p>A much lower serving cost combines vitamin C, quercetin, nettle root, bromelain, and N-acetylcysteine for sinus-oriented support. Most amounts are modest and botanical activity details are missing, so depth is lower than in the original.</p>
63 Budget

Anti-Fatigue

Kroeger Herb Products Co.
<p>A substantially lower serving cost provides vitamin C and several B vitamins, with some overlap through pantothenic acid and licorice. The unbalanced vitamin amounts and unspecified licorice dose make it a less focused seasonal formula despite the savings.</p>
78 Value

Quercetin Bromelain & Vitamin C

Solaray
<p>Substantial quercetin and vitamin C deliver the central antioxidant support at a lower serving cost. Bromelain is less substantial and lacks activity units, while unbuffered vitamin C may be less comfortable for sensitive stomachs.</p>
79 Value

Activated Quercetin

Source Naturals
<p>Large quercetin, vitamin C, and bromelain amounts provide focused coverage with strong goal alignment. Its serving cost is only modestly higher, although missing bromelain activity prevents a complete potency comparison.</p>
69 Value

Sinus Adult Sinus Support

Redd Remedies
<p>Quercetin, N-acetylcysteine, bromelain, vitamin C, citrus flavonoids, and nettle form a coherent sinus-support option near the original's serving cost. Several botanicals are modest and bromelain activity is undisclosed, but the ingredient breadth supports reasonable quality-adjusted value.</p>
Report alternatives

Sources

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

  1. 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
  2. Effect of Vitamin C Supplements on Respiratory Tract Infections: A Systematic Review and Meta-Analysis.
    Keya TA; Leela A; Fernandez K; Habib N; Rashid M · Current reviews in clinical and experimental pharmacology · 2022
    Meta-analysis10 studies pooledImmunity forVitamin C
  3. Vitamin C for the management of COVID-19: a systematic review and meta-analysis of randomized controlled trials.
    Abid H; Mushtaq I; Munir ABI; Shakil J; Vinjamuri S; Tadasare N; Kiran F; Muhammad Wali Mirza A; Fatima Khidri F; Shahid A; Ayyan M; Ehsan M; Cheema HA; Alsubari AMA; Sahra S; Siddiqi NI · Annals of medicine and surgery (2012) · 2026
    Meta-analysis9 studies pooledImmunity forVitamin C
  4. 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
  5. Effects of vitamin C on oxidative stress, inflammation, muscle soreness, and strength following acute exercise: meta-analyses of randomized clinical trials.
    Righi NC; Schuch FB; De Nardi AT; Pippi CM; de Almeida Righi G; Puntel GO; da Silva AMV; Signori LU · European journal of nutrition · 2021
    Meta-analysis313 participants18 studies pooledAnti-Inflammatory Support forVitamin C
  6. A High Vitamin C Micronutrient Supplement Is Unable to Attenuate Inflammation in People with Metabolic Syndrome but May Improve Metabolic Health Indices: A Randomised Controlled Trial.
    Vlasiuk E; Zawari M; Whitehead R; Williman J; Carr AC · Antioxidants (Basel, Switzerland) · 2024
    Randomized trial72 participantsAnti-Inflammatory Support forVitamin C
  7. Safety, Tolerability, and Efficacy of Hox Alpha, a Dry Extract from Stinging Nettle Leaves versus OTC NSAIDs in Osteoarthritis: A Retrospective, Propensity-Matched 12-Week Analysis from the German Pain e-Registry (SIPHARO Study).
    Überall MA; Küster MA; Müller-Schwefe PCG; Müller-Schwefe GHH · Journal of pain research · 2026
    Cohort study2,146 participantsAnti-Inflammatory Support forStinging Nettle
  8. [Recommendations of the DGRh Committee on Complementary Medicine and Nutrition on the application of selected phytotherapeutic drugs and herbal medicines in rheumatology].
    Keyßer G; Seifert O; Frohne I; Michalsen A; Pfeil A; Reuß-Borst M; Sander O · Zeitschrift fur Rheumatologie · 2025
    Guideline / consensusAnti-Inflammatory Support forStinging Nettle
  9. Placebo-controlled randomized clinical trial on the immunomodulating activities of low- and high-dose bromelain after oral administration - new evidence on the antiinflammatory mode of action of bromelain.
    Müller S; März R; Schmolz M; Drewelow B; Eschmann K; Meiser P · Phytotherapy research : PTR · 2013
    Randomized trial12 participantsAnti-Inflammatory Support General Health Immunity forBromelain
  10. Is bromelain an effective drug for the control of pain and inflammation associated with impacted third molar surgery? Systematic review and meta-analysis.
    de A C Almeida R; de Sousa Lima FCM; do E Vasconcelos BC · International journal of oral and maxillofacial surgery · 2019
    Meta-analysis252 participants5 studies pooledAnti-Inflammatory Support forBromelain
  11. Effect of Oral Administration of Bromelain on Postoperative Discomfort After Third Molar Surgery.
    Ghensi P; Cucchi A; Creminelli L; Tomasi C; Zavan B; Maiorana C · The Journal of craniofacial surgery · 2018
    Randomized trial84 participantsAnti-Inflammatory Support forBromelain
  12. Therapeutic efficacy of bromelain in impacted third molar surgery: a randomized controlled clinical study.
    Ordesi P; Pisoni L; Nannei P; Macchi M; Borloni R; Siervo S · Quintessence international (Berlin, Germany : 1985) · 2016
    Randomized trial80 participantsAnti-Inflammatory Support forBromelain
  13. Efficacy of proteolytic enzyme bromelain on health outcomes after third molar surgery. Systematic review and meta-analysis of randomized clinical trials.
    Mendes ML; do Nascimento-Júnior EM; Reinheimer DM; Martins-Filho PR · Medicina oral, patologia oral y cirugia bucal · 2019
    Meta-analysis6 studies pooledAnti-Inflammatory Support General Health forBromelain
  14. An Evaluation of the Effects of Pineapple-Extract and Bromelain-Based Treatment after Mandibular Third Molar Surgery: A Randomized Three-Arm Clinical Study.
    Colletti A; Procchio C; Pisano M; Martelli A; Pellizzato M; Cravotto G · Nutrients · 2024
    Randomized trial42 participantsAnti-Inflammatory Support forBromelain
  15. Therapeutic uses of pineapple-extracted bromelain in surgical care - A review.
    Muhammad ZA; Ahmad T · JPMA. The Journal of the Pakistan Medical Association · 2019
    Narrative reviewAnti-Inflammatory Support forBromelain
  16. The effect of hydro alcoholic Nettle (Urtica dioica) extracts on insulin sensitivity and some inflammatory indicators in patients with type 2 diabetes: a randomized double-blind control trial.
    Namazi N; Esfanjani AT; Heshmati J; Bahrami A · Pakistan journal of biological sciences : PJBS · 2012
    Randomized trial50 participantsAnti-Inflammatory Support forStinging Nettle
  17. Urtica Dioica Root Extract on Clinical and Biochemical Parameters in Patients with Benign Prostatic Hyperplasia, Randomized Controlled Trial.
    Akbar Karami A; Sheikhsoleimani M; Reza Memarzadeh M; Haddadi E; Bakhshpour M; Mohammadi N; Mehdi Mirhashemi S · Pakistan journal of biological sciences : PJBS · 2021
    Randomized trial60 participantsAnti-Inflammatory Support forStinging Nettle
  18. Randomized controlled trial of nettle sting for treatment of base-of-thumb pain
    C Randall, H Randall, F Dobbs, C Hutton, H Sanders · Journal of the Royal Society of Medicine · 2000
    Randomized trial27 participantsAnti-Inflammatory Support forStinging Nettle
  19. The role of enzyme supplementation in digestive disorders.
    Roxas M · Alternative medicine review : a journal of clinical therapeutic · 2009
    Narrative reviewDigestive Health forBromelain
  20. Effects of bromelain supplementation on disease activity and quality of life in patients with ulcerative colitis: a randomized, triple-blind, placebo-controlled study.
    Delgarm P; Mokhtare M; Ebrahimi Daryani N; Abolghasemi J; Rahideh ST · Scientific reports · 2025
    Randomized trial70 participantsDigestive Health forBromelain
  21. Perioperative bromelain reduces pain and swelling and improves quality of life measures after mandibular third molar surgery: a randomized, double-blind, placebo-controlled clinical trial.
    Majid OW; Al-Mashhadani BA · Journal of oral and maxillofacial surgery : official journal of the American Association of Oral and Maxillofacial Surgeons · 2014
    Randomized trial45 participantsGeneral Health forBromelain
  22. Bromelain-based enzymatic burn debridement: A systematic review of clinical studies on patient safety, efficacy and long-term outcomes.
    Shoham Y; Gasteratos K; Singer AJ; Krieger Y; Silberstein E; Goverman J · International wound journal · 2023
    Systematic review34 studies pooledGeneral Health forBromelain
  23. Bromelain reduces mild acute knee pain and improves well-being in a dose-dependent fashion in an open study of otherwise healthy adults.
    Walker AF; Bundy R; Hicks SM; Middleton RW · Phytomedicine : international journal of phytotherapy and phytopharmacology · 2003
    Randomized trial77 participantsGeneral Health forBromelain
  24. Dietary intake and blood concentrations of antioxidants and the risk of cardiovascular disease, total cancer, and all-cause mortality: a systematic review and dose-response meta-analysis of prospective studies.
    Aune D; Keum N; Giovannucci E; Fadnes LT; Boffetta P; Greenwood DC; Tonstad S; Vatten LJ; Riboli E; Norat T · The American journal of clinical nutrition · 2019
    Meta-analysis69 studies pooledGeneral Health forVitamin C
  25. Scientific Opinion on the substantiation of a health claim related to vitamin C and increasing non haem iron absorption 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 / consensusGeneral Health forVitamin C
  26. Vitamin C Depletion and All-Cause Mortality in Renal Transplant Recipients.
    Sotomayor CG; Eisenga MF; Gomes Neto AW; Ozyilmaz A; Gans ROB; Jong WHA; Zelle DM; Berger SP; Gaillard CAJM; Navis GJ; Bakker SJ · Nutrients · 2018
    Cohort study598 participantsGeneral Health forVitamin C
  27. Associations of Serum Biomarkers of Fruit and Vegetable Intake With the Risk of Cause-Specific Mortality and All-Cause Mortality: A National Prospective Cohort Study.
    Pu L; Zhang R; Wang X; Zhao T; Sun H; Han L · Frontiers in nutrition · 2022
    Cohort study12,530 participantsGeneral Health forVitamin C
  28. Relation between plasma ascorbic acid and mortality in men and women in EPIC-Norfolk prospective study: a prospective population study. European Prospective Investigation into Cancer and Nutrition.
    Khaw KT; Bingham S; Welch A; Luben R; Wareham N; Oakes S; Day N · Lancet (London, England) · 2001
    Cohort study19,496 participantsGeneral Health forVitamin C
  29. Effectiveness of sodium bicarbonate and zinc chloride mouthwashes in the treatment of oral mucositis and quality of life in patients with cancer under chemotherapy.
    Mohammadi F; Oshvandi K; Kamallan SR; Khazaei S; Ranjbar H; Ahmadi-Motamayel F; Gillespie M; Jenabi E; Vafaei SY · Nursing open · 2022
    Randomized trial144 participantsGeneral Health forZinc
  30. Zinc supplementation in young children with acute diarrhea in India.
    Sazawal S; Black RE; Bhan MK; Bhandari N; Sinha A; Jalla S · The New England journal of medicine · 1995
    Randomized trial937 participantsGeneral Health forZinc
  31. Associations of mortality with ocular disorders and an intervention of high-dose antioxidants and zinc in the Age-Related Eye Disease Study: AREDS Report No. 13.
    Clemons TE; Kurinij N; Sperduto RD; AREDS Research Group · Archives of ophthalmology (Chicago, Ill. : 1960) · 2004
    Randomized trial4,753 participantsGeneral Health forZinc
  32. Effects of zinc and probiotic co-supplementation on inflammation, gastrointestinal symptoms, quality of life, and mood in irritable bowel syndrome patients.
    Rezazadegan M; Soheilipour M; Amani R · Scientific reports · 2026
    Randomized trial84 participantsGeneral Health forZinc
  33. Effect of zinc sulfate supplementation on premenstrual syndrome and health-related quality of life: Clinical randomized controlled trial.
    Siahbazi S; Behboudi-Gandevani S; Moghaddam-Banaem L; Montazeri A · The journal of obstetrics and gynaecology research · 2018
    Randomized trial142 participantsGeneral Health forZinc
  34. Hypomagnesemia Is a Risk Factor for Infections after Kidney Transplantation: A Retrospective Cohort Analysis.
    Odler B; Deak AT; Pregartner G; Riedl R; Bozic J; Trummer C; Prenner A; Söllinger L; Krall M; Höflechner L; Hebesberger C; Boxler MS; Berghold A; Schemmer P; Pilz S; Rosenkranz AR · Nutrients · 2021
    Cohort study376 participantsImmunity forMagnesium
  35. Higher Intake of Dietary Magnesium Is Inversely Associated With COVID-19 Severity and Symptoms in Hospitalized Patients: A Cross-Sectional Study.
    Nouri-Majd S; Ebrahimzadeh A; Mousavi SM; Zargarzadeh N; Eslami M; Santos HO; Taghizadeh M; Milajerdi A · Frontiers in nutrition · 2022
    Cross-sectional study250 participantsImmunity forMagnesium
  36. Mg2+ regulates cytotoxic functions of NK and CD8 T cells in chronic EBV infection through NKG2D.
    Chaigne-Delalande B; Li FY; O'Connor GM; Lukacs MJ; Jiang P; Zheng L; Shatzer A; Biancalana M; Pittaluga S; Matthews HF; Jancel TJ; Bleesing JJ; Marsh RA; Kuijpers TW; Nichols KE; Lucas CL; Nagpal S; Mehmet H; Su HC; Cohen JI; Uzel G; Lenardo MJ · Science (New York, N.Y.) · 2013
    Single-arm trialImmunity forMagnesium
  37. Effect of magnesium on granulocyte function and on the exercise induced inflammatory response.
    Mooren FC; Golf SW; Völker K · Magnesium research · 2003
    Randomized trialImmunity forMagnesium
  38. Maternal and neonatal outcomes following magnesium sulfate in the setting of chorioamnionitis: a meta-analysis.
    Pergialiotis V; Sapantzoglou I; Rodolaki K; Varthaliti A; Theodora M; Antsaklis P; Thomakos N; Stavros S; Daskalakis G; Papapanagiotou A · Archives of gynecology and obstetrics · 2024
    Meta-analysis6,559 participants8 studies pooledImmunity forMagnesium
  39. 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
  40. 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
  41. 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
  42. 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
  43. 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
  44. 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
  45. 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
  46. 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
  47. 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
  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
  58. Role of Oral Vitamin 'C' on Astigmatic Errors in Phacoemulsification.
    Mohan S; Sah K; Khattri M; Ahmad L; Sachan SK · Current eye research · 2021
    Randomized trial400 participantsVision Support forVitamin C
  59. Ascorbic acid metabolites are involved in intraocular pressure control in the general population.
    Hysi PG; Khawaja AP; Menni C; Tamraz B; Wareham N; Khaw KT; Foster PJ; Benet LZ; Spector TD; Hammond CJ · Redox biology · 2019
    Observational studyVision Support forVitamin C
  60. Nutritional modulation of cataract.
    Weikel KA; Garber C; Baburins A; Taylor A · Nutrition reviews · 2014
    Narrative reviewVision Support forVitamin C
  61. Dietary n-3 Fatty Acid, α-Tocopherol, Zinc, vitamin D, vitamin C, and β-carotene are Associated with Age-Related Macular Degeneration in Japan.
    Aoki A; Inoue M; Nguyen E; Obata R; Kadonosono K; Shinkai S; Hashimoto H; Sasaki S; Yanagi Y · Scientific reports · 2017
    Case-control study530 participantsVision Support forVitamin C
  62. Adherence to a Mediterranean diet, lifestyle and age-related macular degeneration: the Coimbra Eye Study - report 3.
    Raimundo M; Mira F; Cachulo MDL; Barreto P; Ribeiro L; Farinha C; Laíns I; Nunes S; Alves D; Figueira J; Merle BM; Delcourt C; Santos L; Silva R · Acta ophthalmologica · 2019
    Case-control study883 participantsVision Support forVitamin C
  63. Antioxidant vitamin and mineral supplements for age-related macular degeneration.
    Evans JR · The Cochrane database of systematic reviews · 2002
    Systematic review170 participants7 studies pooledVision Support forZinc
  64. Antioxidant vitamin and mineral supplements for slowing the progression of age-related macular degeneration.
    Evans JR; Lawrenson JG · The Cochrane database of systematic reviews · 2023
    Meta-analysis3,790 participants5 studies pooledVision Support forZinc
  65. Oral zinc in macular degeneration.
    Newsome DA; Swartz M; Leone NC; Elston RC; Miller E · Archives of ophthalmology (Chicago, Ill. : 1960) · 1988
    Randomized trial151 participantsVision Support forZinc
  66. A randomized, placebo-controlled, clinical trial of high-dose supplementation with vitamins C and E, beta carotene, and zinc for age-related macular degeneration and vision loss: AREDS report no. 8.
    Age-Related Eye Disease Study Research Group · Archives of ophthalmology (Chicago, Ill. : 1960) · 2001
    Randomized trial3,640 participantsVision Support forZinc
  67. Effect of vitamin A and zinc supplementation on the nutriture of children in Northeast Thailand.
    Udomkesmalee E; Dhanamitta S; Sirisinha S; Charoenkiatkul S; Tuntipopipat S; Banjong O; Rojroongwasinkul N; Kramer TR; Smith JC · The American journal of clinical nutrition · 1992
    Randomized trial133 participantsVision Support forZinc