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Aller-C

4.9
★ ★ ★ ★ ★
(67 ratings)
Vitamin C 900 mg
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Score45
A high-dose vitamin C product weakened by an opaque proprietary blend and poor value. The undisclosed blend should be verified before purchase.
How scoring works
Capsule
Quantity:200 Capsule(s) • (100 servings)
Goals:
Immunity
General Health
Skin Health

Score 45

A high-dose vitamin C product weakened by an opaque proprietary blend and poor value. The undisclosed blend should be verified before purchase.
How scoring works
$57.40($0.57 per serving)
Vitacost
$ 66.99
iHerb
$ 57.40
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Analysis

The 900 mg vitamin C serving provides meaningful antioxidant, immune, and collagen-related nutrition. Its ordinary ascorbic acid form offers no buffering or special delivery advantage.

A 380 mg proprietary blend occupies a large part of the label without revealing its individual ingredients or doses in the supplied data. That opacity prevents judging benefits, interactions, or whether the blend coherently supports the product's purpose.

The two-capsule serving allows some practical use but costs far more than simple vitamin C alternatives. Buyers should choose it only after confirming that the hidden blend contains ingredients they specifically want.

Who is it for
  • Adults who can review the complete proprietary blend label
  • Users specifically seeking the blend's ingredients
  • People who tolerate unbuffered ascorbic acid
Best for
  • High-potency vitamin C
  • Users who have confirmed the added blend fits their needs
  • Situations where price is secondary

Pros

  • Substantial 900 mg vitamin C serving
  • Vitamin C amount is separated from the blend
  • Two-capsule serving may permit partial dosing

Cons

  • Proprietary blend hides ingredients and doses
  • High cost for vitamin C delivery
  • Basic unbuffered ascorbic acid
  • Formula cannot be fully assessed

Warnings

  • Review the physical label for every proprietary-blend ingredient before use, especially if you have allergies or take medicines
  • The 900 mg ascorbic acid amount may cause loose stools or stomach upset
  • People prone to calcium oxalate kidney stones should seek advice before regular high-dose vitamin C

Nutrient quality

60 Moderate impact

Plain ascorbic acid offers no buffering or delivery advantage. The vitamin C amount is meaningful, while the hidden blend cannot be judged for dose or fit.

Ingredient transparency

38 Lower impact

The vitamin C amount is clear, but the proprietary blend hides every constituent dose. Daily directions and a complete inactive-ingredient list are not supplied.

Customer satisfaction

64 Moderate impact

The aggregate rating is very strong, but the number of ratings is limited. No review excerpts are supplied, so repeated complaints and purpose-specific experiences cannot be assessed.

Value for money

21 Situational impact

The premium serving cost is not supported by the basic vitamin C form. An opaque blend prevents confirmation that the added expense delivers meaningful benefit.

Report analysis

Goals

Immunity
Impact
High effect
A- Goal FitB+ Strength of SupportC- CoverageC- Formula Quality
Vitamin C · 900 mg

A substantial vitamin C amount provides credible antioxidant and immune-cell support. The accompanying blend may broaden the formula, but hidden ingredients and doses prevent judging its immune relevance.

Vitamin C exceeds the main dose target and is clearly separated from the blend. Unbuffered ascorbic acid and a large proprietary blend limit both form quality and dose transparency.

Study evidence
Vitamin C Supportive 53 studies
General Health
Impact
High effect
B+ Goal FitC+ Strength of SupportD+ CoverageD+ Formula Quality
Vitamin C · 900 mg

A substantial amount of vitamin C provides relevant antioxidant and collagen-supporting nutrition. The primary vitamin amount is disclosed separately from the accompanying blend.

Plain ascorbic acid offers no delivery advantage, while the proprietary blend prevents a full dose assessment. The extra blend broadens the label more than it strengthens a clear general wellness strategy.

Study evidence
Vitamin C Supportive 56 studies
Skin Health
Impact
Moderate effect
B- Goal FitB Strength of SupportD CoverageD Formula Quality
Vitamin C · 900 mg

Vitamin C supports collagen synthesis and antioxidant defense, giving the formula a clear but narrow skin-health role. A large disclosed ascorbic acid amount provides ample vitamin C.

The unbuffered form offers no absorption advantage, and the accompanying proprietary blend cannot be assessed. A single vitamin C product does not directly supply collagen peptides, barrier lipids, or dedicated hydration actives.

Study evidence
Vitamin C Supportive 53 studies

Ingredients

IngredientAmount per serving
Vitamin C (Ascorbic Acid)
900 mg
Proprietary Blend
380 mg
Gluten Free Adults 18–50 Dairy Free Sugar Free
Report overview
F Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyF Value

A substantial target-range dose is clearly separated from the accompanying proprietary blend. The vitamin C itself is ordinary unbuffered ascorbic acid, so it offers no delivery or comfort advantage. High cost per delivered amount makes it a weak value when vitamin C is the main priority.

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Sources

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

  1. Vitamin C intake and multiple health outcomes: an umbrella review of systematic reviews and meta-analyses.
    Xu K; Peng R; Zou Y; Jiang X; Sun Q; Song C · International journal of food sciences and nutrition · 2022
    Meta-analysis76 studies pooledGeneral Health forVitamin C
  2. 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
  3. Mortality in randomized trials of antioxidant supplements for primary and secondary prevention: systematic review and meta-analysis.
    Bjelakovic G; Nikolova D; Gluud LL; Simonetti RG; Gluud C · JAMA · 2007
    Meta-analysis232,606 participants68 studies pooledGeneral Health forVitamin C
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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