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Gold C Vitamin C 1000 mg

California Gold Nutrition
4.8
★ ★ ★ ★ ★
(386166 ratings)
Vitamin C 1000 mg
Product Image
Score86
A clear and economical 1,000 mg vitamin C capsule with a large supply. The unbuffered, fixed high dose is the main limitation.
How scoring works
Quantity:240 Capsule(s) • (240 servings)
Goals:
General Health
Immunity
Skin Health
Anti-Inflammatory Support
Vision Support

Score 86

A clear and economical 1,000 mg vitamin C capsule with a large supply. The unbuffered, fixed high dose is the main limitation.
How scoring works

Also available as

1 option
60 servings C 1000 mg • 60 Capsule(s) • 60 servings $4.38 ($0.07 per serving)
$14.84($0.06 per serving)
iHerb
$ 15.42
Amazon
$ 14.84
Report prices

Analysis

A 1,000 mg ascorbic acid capsule provides substantial vitamin C for antioxidant defenses, collagen formation, and normal immune function. The single-active approach keeps the label and intended use clear.

A large bottle supports consistent long-term use and avoids the complexity of proprietary blends. No buffering mineral or enhanced-delivery feature is present.

The full gram cannot be divided as easily as powder and may be more than some users want at once. People with sensitive stomachs may prefer a 500 mg capsule or mineral ascorbate.

Who is it for
  • Adults seeking high-dose vitamin C capsules
  • Regular users who want a large supply
  • People comfortable with plain ascorbic acid
Best for
  • Focused vitamin C support
  • Convenient one-capsule use
  • Antioxidant and collagen support

Pros

  • Full gram per capsule
  • Simple single-active label
  • Large supply

Cons

  • Unbuffered acidic form
  • High fixed amount
  • No complementary nutrients

Warnings

  • The 1,000 mg serving may cause stomach irritation or loose stools in sensitive users.
  • People prone to calcium oxalate kidney stones should avoid unnecessary high vitamin C intake.

Nutrient quality

89 Highest impact

Ascorbic acid is established and absorbable but remains unbuffered and acidic. The vitamin C amount is substantial and well targeted for high-potency use.

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Ingredient transparency

86 Highest impact

The single active ingredient has a specific amount. A complete inactive ingredient list was not supplied.

.

Customer satisfaction

73 High impact

The available aggregate rating is strong for this category. No firsthand outcome details were supplied, so alignment with the intended use is uncertain.

.

Value for money

95 Highest impact

The simple formula provides good quality for a basic vitamin C capsule. The product is highly competitive among plain high-potency vitamin C capsules.

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Report analysis

Goals

General Health
General Health
Impact
Highest effect
A Goal FitA- Strength of SupportB CoverageA+ Formula Quality
Vitamin C · 1000 mg

A substantial ascorbic acid amount provides focused support for antioxidant defenses, immune function, and collagen formation. The single-active capsule is transparent and free from unnecessary blends.

Plain ascorbic acid lacks buffering or enhanced delivery, so people with sensitive stomachs may find it irritating. The product offers strong depth for vitamin C but does not address wider nutritional gaps.

Study evidence
Vitamin C Supportive 56 studies
Immunity
Immunity
Impact
Highest effect
A+ Goal FitA- Strength of SupportC CoverageA+ Formula Quality
Vitamin C · 1000 mg

Vitamin C directly supports immune-cell activity, barrier function, and antioxidant defense. Human evidence supports vitamin C for maintaining immune function and modestly shortening some respiratory illnesses.

The disclosed vitamin C amount meets the preferred immune-support threshold. The amount and basic ascorbic acid form are clear, though the unbuffered form lacks enhanced delivery.

Study evidence
Vitamin C Supportive 53 studies
Skin Health
Skin Health
Impact
High effect
B+ Goal FitB+ Strength of SupportD+ CoverageA Formula Quality
Vitamin C · 1000 mg

Plain ascorbic acid supplies a useful vitamin C amount for collagen formation and antioxidant defense. No barrier-lipid or hydration active is included.

The single-active focus makes its strengths and limits easy to assess. Large vitamin C servings may still cause stomach upset in sensitive users.

Study evidence
Vitamin C Supportive 53 studies
Anti-Inflammatory Support
Anti-Inflammatory Support
Impact
High effect
B- Goal FitA- Strength of SupportD+ CoverageA+ Formula Quality
Vitamin C · 1000 mg

A full gram of vitamin C provides substantial antioxidant support that may help limit oxidative stress accompanying inflammation. The simple label makes the dose easy to assess and avoids unnecessary actives.

Plain ascorbic acid is not buffered and the formula does not directly target major inflammatory enzymes or cover other pathways. The high single amount may cause stomach irritation or loose stools, and people prone to calcium oxalate kidney stones should avoid unnecessary high intake.

Study evidence
Vitamin C Supportive 50 studies
Vision Support
Vision Support
Impact
High effect
D+ Goal FitB+ Strength of SupportD CoverageB+ Formula Quality
Vitamin C · 1000 mg

Vitamin C contributes retinal antioxidant protection but cannot cover macular pigment or structural needs alone. Vitamin C appears in established ocular nutrient combinations, though standalone evidence is limited for broad vision outcomes.

One gram of vitamin C supplies a meaningful antioxidant amount rather than a token inclusion. Plain ascorbic acid is clearly disclosed but lacks buffering or enhanced delivery.

Study evidence
Vitamin C Disputed 24 studies

Ingredients

IngredientAmount per serving
Vitamin C (Ascorbic Acid)
 1000 mg
Gluten Free Adults 18–50 Dairy Free Vegetarian
Report overview
Vitamin C (Ascorbic Acid) · 1000 mg OverallScore72
F Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value

A full gram of ascorbic acid lands in the preferred dose range and costs very little per gram. The basic unbuffered form lacks special absorption or stomach-comfort features. Sensitive users may experience less irritation by taking it with food.

View ingredientView products
Loading alternative details
89 Performance

Pure Buffered Calcium Ascorbate

NOW
A more performance-focused option combines 890 mg of vitamin C as Calcium Ascorbate with 100 mg of Calcium. Compared with the original's 1,000 mg of vitamin C as Ascorbic Acid, the smaller amount favors moderate daily use but provides less vitamin C per serving.
88 Performance

Buffered Gold C

California Gold Nutrition
A more performance-focused option combines 1,000 mg of vitamin C as Sodium Ascorbate with a focused single-nutrient formula. The amount matches the original, while Sodium Ascorbate replaces Ascorbic Acid and gives users a different disclosed form.
85 Performance

Ester-C Plus 1000 mg Vitamin C

Solgar
A more performance-focused option combines 1,000 mg of vitamin C as Ester-C with 108 mg of Calcium and 200 mg of Citrus Bioflavonoids Complex. The amount matches the original, while Ester-C replaces Ascorbic Acid and gives users a different disclosed form.
84 Budget

Ester-C 500 mg With Citrus Bioflavoinds

American Health
The lower serving cost still provides 1,000 mg of vitamin C as Ester-C Calcium Ascorbate with 110 mg of Calcium and 400 mg of Citrus Bioflavonoids Complex. The amount matches the original, while Ester-C Calcium Ascorbate replaces Ascorbic Acid and gives users a different disclosed form.
89 Budget

C-500 Calcium Ascorbate-C

NOW
The lower serving cost still provides 500 mg of vitamin C as Calcium Ascorbate with 55 mg of Calcium and 10 mg of Citrus Bioflavonoid Complex. Compared with the original's 1,000 mg of vitamin C as Ascorbic Acid, the smaller amount favors moderate daily use but provides less vitamin C per serving.
88 Budget

Sodium Ascorbate

NutriBiotic Immunity
The lower serving cost still provides 1,100 mg of vitamin C as Sodium Ascorbate with a focused single-nutrient formula. Compared with the original's 1,000 mg of vitamin C as Ascorbic Acid, the larger disclosed amount may better fit users seeking higher-potency vitamin C.
85 Value

C-500 With Rose Hips

NOW
The favorable serving cost pairs 500 mg of vitamin C as Ascorbic Acid with 40 mg of Rose Hips powder. Compared with the original's 1,000 mg of vitamin C as Ascorbic Acid, the smaller amount favors moderate daily use but provides less vitamin C per serving.
87 Value

100% Pure Vitamin C Powder

Swanson Premium Brand
The favorable serving cost pairs 1,000 mg of vitamin C as Ascorbic Acid with a focused single-nutrient formula. The vitamin C amount is similar to the original, while the added ingredients and label details determine the more useful fit.
87 Value

C 500 mg

Mason Natural
The favorable serving cost pairs 500 mg of vitamin C as Ascorbic Acid with a focused single-nutrient formula. Compared with the original's 1,000 mg of vitamin C as Ascorbic Acid, the smaller amount favors moderate daily use but provides less vitamin C per serving.
Report alternatives

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