Product Image

Lemon Electro-C

NutriBiotic Immunity
4.6
★ ★ ★ ★ ★
(397 ratings)
Vitamin C 850 mg
Chloride 10 mg
Product Image
Score79
A focused and adjustable vitamin C powder with light buffering minerals. It is economical but should not be mistaken for a meaningful electrolyte product.
How scoring works
Quantity:16 Ounce(s) • (363 servings)
Goals:
Immunity
Anti-Inflammatory Support
General Health
Vision Support

Score 79

A focused and adjustable vitamin C powder with light buffering minerals. It is economical but should not be mistaken for a meaningful electrolyte product.
How scoring works
$14.34($0.03 per serving)
Vitacost
$ 20.09
iHerb
$ 14.34
Report prices

Analysis

L-ascorbic acid supplies 850 mg of vitamin C in a simple powder. Calcium and magnesium carbonates may soften the acidity, while the loose powder gives users control over serving size.

Potassium, sodium, chloride, and zinc appear only in very small amounts. They should be viewed as supporting minerals rather than a meaningful electrolyte replacement formula.

The product fits people who want economical, adjustable vitamin C without a long ingredient list. Users seeking workout hydration or a fully buffered ascorbate should choose a different formulation.

Who is it for
  • People seeking a simple vitamin C powder
  • Users who want adjustable serving sizes
Best for
  • Everyday vitamin C supplementation
  • Mixing a smaller custom serving into drinks

Pros

  • Substantial vitamin C amount
  • Simple formula
  • Powder permits dose adjustment
  • Buffering minerals may improve palatability

Cons

  • Electrolyte amounts are negligible
  • Uses plain ascorbic acid
  • Mineral forms are ordinary
  • Not suited to significant sweat losses

Warnings

  • The 850 mg ascorbic acid serving may cause digestive discomfort or loose stools.
  • People prone to kidney stones should seek individual guidance before regular high vitamin C intake.
  • Measure the loose powder carefully to avoid unintentionally large servings.

Nutrient quality

73 High impact

Vitamin C provides the main meaningful contribution in a focused powder. Tiny electrolyte amounts and basic mineral forms limit broader utility.

.

Ingredient transparency

82 Highest impact

All active forms and amounts are clearly disclosed without a hidden blend. Missing measuring directions and non-active ingredients leave practical gaps.

.

Customer satisfaction

68 High impact

The aggregate rating is strong and supported by a large feedback count. No complaint-level evidence was supplied to identify recurring issues or confirm purpose-specific experiences.

.

Value for money

90 Highest impact

A focused formula and very low serving cost provide excellent vitamin C value. The tiny electrolyte additions add little but do not materially inflate the product.

.
Report analysis

Goals

Immunity
Immunity
Impact
Highest effect
A Goal FitA Strength of SupportB- CoverageA Formula Quality
Magnesium · 31 mgVitamin C · 850 mgZinc · 1 mg

Vitamin C lands in a well-aligned immune-support range, and mineral carbonates may soften the acidity of plain ascorbic acid. Small electrolyte and zinc amounts add limited support without changing the formula focus.

Strong dose clarity and a simple powder design support practical use. The product remains centered on antioxidant defense and does not provide meaningful breadth across cellular or barrier pathways.

Study evidence
Vitamin C Supportive 53 studies
Zinc Supportive 73 studies
Anti-Inflammatory Support
Anti-Inflammatory Support
Impact
Highest effect
B Goal FitA Strength of SupportC CoverageA Formula Quality
Vitamin C · 850 mg

Vitamin C supplies substantial antioxidant support, while the electrolyte minerals add modest cofactor support. The formula remains focused on oxidative stress rather than direct inflammatory-enzyme or fatty-acid pathways.

The vitamin C amount falls within the preferred range and the mineral carbonates partly soften the acid load. Exact disclosure is strong, but plain ascorbic acid and small mineral amounts provide only moderate form and pathway breadth.

Study evidence
Vitamin C Supportive 50 studies
General Health
General Health
Impact
Highest effect
A- Goal FitB+ Strength of SupportC+ CoverageA- Formula Quality
Magnesium · 31 mgZinc · 1 mgVitamin C · 850 mg

A well-targeted vitamin C amount provides the main antioxidant and collagen-support benefit. Small amounts of minerals help buffer the powder and add limited electrolyte support.

The mineral doses are too low to make this a strong rehydration or broad mineral product. Plain ascorbic acid may still bother sensitive stomachs despite the partial buffering.

Study evidence
Vitamin C Supportive 56 studies
Zinc Supportive 60 studies
Vision Support
Vision Support
Impact
High effect
C+ Goal FitA- Strength of SupportD CoverageB Formula Quality
Zinc · 1 mgVitamin C · 850 mg

850 mg of vitamin C provides substantial antioxidant support for the lens and other ocular tissues. An isolated vitamin C formula lacks the carotenoids, zinc, copper, and omega-3 fats used in more complete eye-support strategies.

L-ascorbic acid is clearly identified and small electrolyte amounts add hydration support with little ocular relevance. The narrow formula is best viewed as foundational antioxidant support rather than comprehensive vision care.

Study evidence
Vitamin C Disputed 24 studies
Zinc Supportive 39 studies
Skin Health
Skin Health
Impact
Moderate effect
C+ Goal FitB Strength of SupportD+ CoverageC- Formula Quality
Zinc · 1 mgVitamin C · 850 mg

850 mg of vitamin C provides a strong collagen cofactor and antioxidant, while electrolytes and only 1 mg of zinc add limited secondary support. The formula does not supply collagen, ceramides, or another direct hydration active.

The main vitamin C amount is clearly stated and meaningful. The added minerals broaden the label slightly, but they do not create broad skin-pathway coverage.

Study evidence
Vitamin C Supportive 53 studies
Zinc Supportive 66 studies

Ingredients

IngredientAmount per serving
Vitamin C (L-Ascorbic Acid)
 850 mg
Calcium (Calcium Carbonate)
 44 mg
Magnesium (Magnesium Carbonate)
 31 mg
Zinc (Zinc Sulfate)
 1 mg
Chloride (Sodium Chloride)
 10 mg
Sodium (Sodium Chloride)
 5 mg
Potassium (Potassium Bicarbonate)
 10 mg
Gluten Free Adults 18–50 Vegan Dairy Free Vegetarian
Report overview
Vitamin C (L-Ascorbic Acid) · 850 mg OverallScore76
F Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value

The vitamin C amount lands in the preferred range, but generic L-ascorbic acid offers no advanced delivery advantage. Mineral carbonates and bicarbonate may soften the acid load and improve tolerance. Very low cost per effective dose and clear mineral disclosure make it practical.

View ingredientView products
Chloride (Sodium Chloride) · 10 mg OverallScore65
C Active Ingredient Quality & BioavailabilityD+ Dose, Safety & Label TransparencyA+ Value

The powder dissolves for use as a drink and clearly identifies sodium chloride as the source. Its chloride contribution is only a trace amount, so it offers little meaningful electrolyte replenishment from chloride. The very low serving cost still makes it economical for users who want the broader vitamin and mineral blend.

View ingredientView products
Loading alternative details
88 Performance

Sodium Ascorbate Capsules

NutriBiotic Immunity
Buffered sodium ascorbate provides a useful vitamin C amount with its sodium contribution clearly disclosed. It is likely gentler than the original ascorbic acid powder, although sodium-restricted users should include it in their daily total.
88 Performance

Buffered Gold C

California Gold Nutrition
A simple buffered sodium ascorbate powder supplies a substantial vitamin C amount with clear sodium disclosure. It improves form quality over the original unbuffered product while retaining a large, efficient supply.
82 Performance

SaltStick Electrolyte Caps

SaltStick
Sodium, chloride, potassium, magnesium, and calcium create a more coherent electrolyte formula than the original product's trace mineral additions. Vitamin C is absent and the mineral amounts suit moderate rather than heavy losses, so it serves a different primary need.
85 Budget

C-500 With Rose Hips

NOW
A straightforward vitamin C tablet provides a meaningful amount at a slightly lower serving cost. It omits the original product's small electrolyte additions and uses unbuffered ascorbic acid, but the rose hip addition offers a simple compatible botanical.
87 Budget

100% Pure Vitamin C Powder

Swanson Premium Brand
Pure ascorbic acid powder offers flexible dosing and strong economy with no negligible electrolyte additions. It closely matches the original vitamin C form, though sensitive users may prefer a buffered product.
83 Budget

C 500 mg

21st Century
A large supply of simple vitamin C tablets supports inexpensive routine use with clear active dosing. The amount is lower and the formula does not provide meaningful electrolytes, but those minerals were also minimal in the original powder.
88 Value

Sodium Ascorbate

NutriBiotic Immunity
Bulk sodium ascorbate combines full buffering with a substantial vitamin C serving and highly efficient supply. Measuring accuracy and sodium accounting require attention, but the ingredient form is more practical for sensitive stomachs than plain ascorbic acid.
89 Value

C-500 Calcium Ascorbate-C

NOW
Buffered calcium ascorbate provides a moderate vitamin C amount with clear calcium disclosure and favorable serving value. The small bioflavonoid addition contributes little, yet the core form is more refined than the original unbuffered powder.
84 Value

Ester-C 500 mg With Citrus Bioflavoinds

American Health
Buffered Ester-C and citrus bioflavonoids offer a stomach-friendly vitamin C option at a competitive serving value. The formula does not provide the original product's electrolyte mix, but those added mineral amounts were too small for meaningful rehydration.
Report alternatives

Sources

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

  1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. 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
  20. 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
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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
  26. 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
  27. 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
  28. 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
  29. 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
  30. 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
  31. 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
  32. 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
  33. 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
  34. 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
  35. 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
  36. 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
  37. 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
  38. Nutritional modulation of cataract.
    Weikel KA; Garber C; Baburins A; Taylor A · Nutrition reviews · 2014
    Narrative reviewVision Support forVitamin C
  39. 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
  40. 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
  41. 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
  42. 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
  43. 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
  44. 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
  45. 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