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Vitamin C Powder 5000 mg

4.7
★ ★ ★ ★ ★
(358 ratings)
Vitamin C 5000 mg
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Score64
A transparent single-ingredient powder with flexible dosing. The full 5,000 mg serving is unnecessarily large and carries substantial tolerance concerns.
How scoring works
Powder
Quantity:8 Ounce(s) • (45 servings)
Goals:
Anti-Inflammatory Support

Score 64

A transparent single-ingredient powder with flexible dosing. The full 5,000 mg serving is unnecessarily large and carries substantial tolerance concerns.
How scoring works
$18.89($0.41 per serving)
Vitacost
$ 18.89
iHerb
$ 18.89
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Analysis

Pure ascorbic acid powder is easy to assess and can be measured below the labeled full serving. Vitamin C supports antioxidant defenses, normal immune function, and collagen formation.

The 5,000 mg serving is excessive for routine use and absorption becomes increasingly inefficient at high amounts. A large portion may remain in the digestive tract, increasing the chance of diarrhea, nausea, and cramping.

Adjustable dosing is the product's main practical strength, but clear lower-dose directions were not supplied. Users who want a standard daily serving or gentler form will likely find a moderate-dose capsule or buffered powder easier to manage.

Who is it for
  • Experienced users who can measure smaller servings
  • People wanting a single-ingredient powder
  • Users avoiding tablets and capsules
Best for
  • Flexible dose adjustment
  • Single-ingredient simplicity
  • Mixing into beverages

Pros

  • Only one active ingredient
  • Dose can be adjusted
  • No hidden active blend
  • Powder format avoids pills

Cons

  • Extremely large full serving
  • Unbuffered acidic form
  • No complementary nutrients
  • Lower-dose guidance is not supplied

Warnings

  • The 5,000 mg serving may cause diarrhea, nausea, or abdominal cramping.
  • Very high vitamin C intake may raise urinary oxalate and is a concern for people prone to kidney stones.
  • Ascorbic acid powder is acidic and should be diluted rather than held against teeth.

Nutrient quality

51 Moderate impact

The pure powder is focused and uses a recognized vitamin C form. An excessive serving sharply weakens dose quality, tolerance, and practical fit.

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Ingredient transparency

82 Highest impact

The sole active and its amount are plainly disclosed without a hidden blend. Missing preparation directions and a complete label statement create smaller but relevant gaps.

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Customer satisfaction

67 High impact

The aggregate satisfaction signal is strong and supported by moderate volume. Missing review details prevent assessment of tolerance complaints or purpose fit.

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Value for money

53 Moderate impact

A pure single-ingredient formula avoids low-value extras. The oversized serving and weak serving economics make more moderate powders more competitive.

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Report analysis

Goals

Anti-Inflammatory Support
Anti-Inflammatory Support
Impact
High effect
B- Goal FitB Strength of SupportF CoverageB+ Formula Quality
Vitamin C · 5000 mg

Vitamin C powder delivers a very large antioxidant amount that may support inflammatory balance. The single-ingredient format is transparent and easy to assess.

A 5,000 mg serving exceeds typical daily supplemental use and may cause diarrhea or abdominal cramping. Large vitamin C doses can also raise urinary oxalate, which is a concern for people prone to kidney stones.

Study evidence
Vitamin C Supportive 50 studies
Skin Health
Skin Health
Impact
Moderate effect
B+ Goal FitD Strength of SupportF CoverageA- Formula Quality
Vitamin C · 5000 mg

Vitamin C directly supports collagen synthesis, but the 5,000 mg serving is far beyond the amount needed for that role. More vitamin C at this level does not imply greater skin benefit.

Pure ascorbic acid powder is clearly disclosed and allows dose adjustment. The full serving may cause diarrhea or abdominal cramping and can raise kidney-stone risk in susceptible users.

Study evidence
Vitamin C Supportive 53 studies
General Health
General Health
Impact
Moderate effect
A Goal FitF Strength of SupportD CoverageB+ Formula Quality
Vitamin C · 5000 mg

Vitamin C supports foundational antioxidant defenses, collagen formation, and normal immune function. The formula supports antioxidant, collagen, and immune pathways but does not fill a broad range of nutrient gaps.

The 5,000 mg serving greatly exceeds usual daily supplemental needs and is unlikely to add proportional benefit. A 5,000 mg serving of ascorbic acid can cause diarrhea and abdominal cramping in many users.

Study evidence
Vitamin C Supportive 56 studies
Immunity
Immunity
Impact
Moderate effect
A Goal FitF Strength of SupportF CoverageB- Formula Quality
Vitamin C · 5000 mg

The powder provides vitamin C as plain ascorbic acid, an established nutrient for immune-cell function and antioxidant protection. Its single-ingredient design is easy to understand.

The 5,000 mg serving is far beyond the amount needed for routine immune support and may cause diarrhea, cramping, or nausea. Such a high intake may also raise kidney-stone risk in susceptible people without adding proportional benefit.

Study evidence
Vitamin C Supportive 53 studies
Vision Support
Vision Support
Impact
Moderate effect
D- Goal FitD Strength of SupportF CoverageB+ Formula Quality
Vitamin C · 5000 mg

Vitamin C supports ocular antioxidant defense and appears in established multi-nutrient eye formulas. The powder provides an excessive amount for routine vision support and lacks complementary eye nutrients.

No lutein, zeaxanthin, vitamin E, zinc, or omega-3 fats are included. A 5,000 mg serving can cause diarrhea and stomach cramping, and may raise kidney-stone risk in susceptible people.

Study evidence
Vitamin C Disputed 24 studies

Ingredients

IngredientAmount per serving
Vitamin C, Powder (Ascorbic Acid)
 5000 mg
Adults 18–50
Report overview
Vitamin C (Ascorbic Acid) · 5000 mg OverallScore62
F Active Ingredient Quality & BioavailabilityB Dose, Safety & Label TransparencyA+ Value

The powder delivers a very large 5,000 mg serving of generic ascorbic acid. Its simple composition and low cost per gram are clear strengths, but the unbuffered form offers no absorption or stomach-comfort advantage. Such a large amount has reduced absorption efficiency and can cause loose stools or digestive discomfort.

View ingredientView products
Loading alternative details
86 Performance

Ester-C Plus 1000 mg Vitamin C

Solgar
Ingredient and delivery quality improve with 1,000 mg of buffered Ester-C with 108 mg of calcium and 200 mg of citrus bioflavonoids. Compared with the original 5000 mg ascorbic-acid formula, the substantial buffered dose and compatible bioflavonoids broaden support beyond plain ascorbic acid, although complete excipient details are not supplied.
86 Performance

C

Swanson
Ingredient and delivery quality improve with 1,000 mg of calcium ascorbate with 120 mg of calcium and 200 mg of citrus bioflavonoids. Compared with the original 5000 mg ascorbic-acid formula, the buffered form and meaningful bioflavonoid amount offer a broader formula than plain ascorbic acid, although complete excipient details are not supplied.
84 Performance

Ester-C 24 Hour Immune Support 1000 mg

NatureSmart
Ingredient and delivery quality improve with 1,000 mg of buffered Ester-C with 110 mg of calcium and 102 mg of citrus bioflavonoids. Compared with the original 5000 mg ascorbic-acid formula, the buffered form and bioflavonoids combine stomach-comfort potential with a focused vitamin C dose, although the supplied data do not include the complete inactive-ingredient panel.
89 Budget

Pure Buffered Calcium Ascorbate

NOW
A lower serving cost comes with 890 mg of vitamin C as buffered calcium ascorbate with 100 mg of calcium, compared with the original 5000 mg ascorbic-acid formula. the mineral-bound form may be gentler than plain ascorbic acid and keeps the active formula focused, although the full inactive-ingredient panel is not supplied.
88 Budget

Sodium Ascorbate

NutriBiotic Immunity
A lower serving cost comes with 1,100 mg of vitamin C as sodium ascorbate with 120 mg of sodium, compared with the original 5000 mg ascorbic-acid formula. the fully buffered powder provides a substantial, clearly disclosed amount, although careful measuring and sodium accounting remain important.
88 Budget

Buffered Gold C

California Gold Nutrition
A lower serving cost comes with 1,000 mg of vitamin C as sodium ascorbate with 130 mg of sodium, compared with the original 5000 mg ascorbic-acid formula. the simple buffered formula provides a full amount with no unrelated active ingredients, although the sodium contribution needs consideration on a restricted diet.
89 Value

C-500 Calcium Ascorbate-C

NOW
A stronger quality-to-cost balance comes from 500 mg of vitamin C as calcium ascorbate with 55 mg of calcium and 10 mg of citrus bioflavonoids. Compared with the original 5000 mg ascorbic-acid formula, the buffered form supports stomach comfort while retaining a practical daily amount, while the bioflavonoid addition is small.
84 Value

Ester-C 500 mg With Citrus Bioflavoinds

American Health
A stronger quality-to-cost balance comes from 1,000 mg of buffered Ester-C with a broad citrus bioflavonoid complex. Compared with the original 5000 mg ascorbic-acid formula, the formula adds several named citrus compounds while maintaining a substantial vitamin C amount, while the repeated complex entries make the exact internal amounts difficult to interpret.
88 Value

Sodium Ascorbate Capsules

NutriBiotic Immunity
A stronger quality-to-cost balance comes from 850 mg of vitamin C as sodium ascorbate with 100 mg of sodium. Compared with the original 5000 mg ascorbic-acid formula, the fully buffered form provides clear dosing and may be easier on the stomach than plain ascorbic acid, while the sodium contribution needs consideration on a restricted diet.
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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. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. 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
  20. 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
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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
  26. Nutritional modulation of cataract.
    Weikel KA; Garber C; Baburins A; Taylor A · Nutrition reviews · 2014
    Narrative reviewVision Support forVitamin C
  27. 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
  28. 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