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Gold C Vitamin C 1000 mg

California Gold Nutrition
4.7
★ ★ ★ ★ ★
(41650 ratings)
Vitamin C 1000 mg
Product Image
Score85
A simple, adjustable 1,000 mg ascorbic acid product with strong value. Dividing the amount may improve tolerance.
How scoring works
Quantity:8 Liquid(s) • (250 servings)
Goals:
Anti-Inflammatory Support
Immunity
General Health
Skin Health
Vision Support

Score 85

A simple, adjustable 1,000 mg ascorbic acid product with strong value. Dividing the amount may improve tolerance.
How scoring works
$7.22($0.02 per serving)
iHerb
$ 7.22
iHerb
$ 7.79
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Analysis

A 1,000 mg serving gives substantial vitamin C for antioxidant defenses, collagen production, and normal immune function. The simple formula avoids proprietary blends and makes the active amount clear.

The loose format allows smaller or divided servings, which can improve comfort and practical absorption. Measuring is less convenient than taking a capsule and depends on consistent handling.

Plain ascorbic acid is not buffered and may feel harsh on an empty stomach. The product best serves cost-conscious users who want control over their serving rather than enhanced delivery.

Who is it for
  • Adults seeking economical vitamin C
  • Users who want flexible servings
  • People comfortable measuring a loose product
Best for
  • Adjustable vitamin C intake
  • Antioxidant and collagen support
  • Routine high-volume use

Pros

  • Substantial vitamin C amount
  • Simple active profile
  • Serving can be divided

Cons

  • Unbuffered acidic form
  • Requires measuring
  • Full serving may be larger than needed

Warnings

  • The 1,000 mg serving may cause stomach upset or loose stools in sensitive users.

Nutrient quality

88 Highest impact

Ascorbic acid is established and absorbable, but liquid delivery lacks disclosed stabilization details. The vitamin C amount is substantial and well targeted for high-potency use.

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Ingredient transparency

83 Highest impact

The vitamin C amount is specifically disclosed. The liquid carrier and stabilization ingredients were not supplied.

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Customer satisfaction

71 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.

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Value for money

96 Highest impact

The basic form limits quality distinction, but the useful amount is inexpensive to obtain. The product is highly competitive on value among plain vitamin C liquids.

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Goals

Anti-Inflammatory Support
Anti-Inflammatory Support
Impact
Highest effect
B Goal FitA- Strength of SupportC CoverageA+ Formula Quality
Vitamin C · 1000 mg

Vitamin C provides substantial antioxidant support and helps regenerate other antioxidants during inflammatory stress. Its role is useful but narrower than fish oil, vitamin D, or botanicals that directly regulate inflammatory enzymes.

The amount reaches the preferred range and is clearly disclosed in a simple scoop-measured powder. Plain ascorbic acid offers no buffering or enhanced delivery, while the focused design avoids underdosed label padding.

Study evidence
Vitamin C Supportive 50 studies
Immunity
Immunity
Impact
Highest effect
B+ Goal FitA- Strength of SupportD+ CoverageA+ Formula Quality
Vitamin C · 1000 mg

Ascorbic acid supplies a substantial amount of an essential antioxidant needed for collagen formation and normal immune function. The single active ingredient is clearly disclosed and supported by established nutritional evidence.

Coverage is narrow because vitamin C alone does not address most daily nutrient needs. The large serving can cause stomach upset or diarrhea, and sustained high intake may be unsuitable for people prone to oxalate kidney stones.

Study evidence
Vitamin C Supportive 53 studies
General Health
General Health
Impact
Highest effect
A- Goal FitB+ Strength of SupportD+ CoverageA Formula Quality
Vitamin C · 1000 mg

A 1000 mg serving of vitamin C provides strong antioxidant, immune, and collagen support in a simple single-ingredient formula. The amount is well aligned with the product's central purpose and is fully disclosed.

Generic ascorbic acid lacks buffering or an advanced delivery system, and the listed liquid format has no stated stabilization method. The acidic form may cause stomach discomfort in sensitive users, particularly when the full serving is taken at once.

Study evidence
Vitamin C Supportive 56 studies
Skin Health
Skin Health
Impact
High effect
C+ Goal FitA- Strength of SupportD+ CoverageB Formula Quality
Vitamin C · 1000 mg

1,000 mg of ascorbic acid supplies an established cofactor for collagen formation and antioxidant protection. The amount is substantial, but oral vitamin C alone is not a complete skin formula.

The ingredient and amount are clearly disclosed in a simple formula. Support is limited to collagen-related and antioxidant needs, with no direct hydration or structural building block.

Study evidence
Vitamin C Supportive 53 studies
Vision Support
Vision Support
Impact
High effect
C+ Goal FitA- Strength of SupportD CoverageB Formula Quality
Vitamin C · 1000 mg

1,000 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.

Ascorbic acid is clearly identified and the single-active tablet remains focused. The narrow formula is best viewed as foundational antioxidant support rather than comprehensive vision care.

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 OverallScore66
F Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value

The vitamin C amount fits the preferred range, but the listed liquid format has no stated stabilization technology. Generic ascorbic acid also lacks buffering for sensitive stomachs. The simple formula delivers excellent dose efficiency at a very low cost.

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.
85 Budget

C-500 With Rose Hips

NOW
The lower serving cost still provides 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.
86 Budget

C

Swanson
No three unused eligible products had a lower listed serving cost, and this close-cost option provides 1,000 mg of vitamin C as Calcium Ascorbate with 120 mg of Calcium and 200 mg of Bioflavonoids. The amount matches the original, while Calcium Ascorbate replaces Ascorbic Acid and gives users a different disclosed form.
88 Budget

Sodium Ascorbate Capsules

NutriBiotic Immunity
No three unused eligible products had a lower listed serving cost, and this close-cost option provides 850 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 smaller amount favors moderate daily use but provides less vitamin C per serving.
88 Value

Sodium Ascorbate

NutriBiotic Immunity
The higher serving cost pairs 1,100 mg of vitamin C as Sodium Ascorbate with a focused single-nutrient formula, so its value depends on wanting that ingredient profile. 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.
87 Value

100% Pure Vitamin C Powder

Swanson Premium Brand
The higher serving cost pairs 1,000 mg of vitamin C as Ascorbic Acid with a focused single-nutrient formula, so its value depends on wanting that ingredient profile. 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 higher serving cost pairs 500 mg of vitamin C as Ascorbic Acid with a focused single-nutrient formula, so its value depends on wanting that ingredient profile. 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. 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
  2. Vitamin C and postoperative outcomes following mandibular third molar extraction: a randomized split-mouth study.
    Demirel M; Aktas A; Kizil M; Yalcin N · Oral surgery, oral medicine, oral pathology and oral radiology · 2026
    Randomized trial56 participantsSkin Health 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. Association between hemoglobin A1c, Vitamin C, and microbiome in diabetic foot ulcers and intact skin: A cross-sectional study.
    Tong KPS; Green SJ; Ortiz J; Wu SC · Health science reports · 2024
    Cross-sectional study42 participantsSkin Health forVitamin C
  5. Immunocompetence and oxidant defense during ascorbate depletion of healthy men.
    Jacob RA; Kelley DS; Pianalto FS; Swendseid ME; Henning SM; Zhang JZ; Ames BN; Fraga CG; Peters JH · The American journal of clinical nutrition · 1992
    Clinical trial8 participantsImmunity forVitamin C
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. Intake of vitamin C, vitamin E, selenium, zinc and polyunsaturated fatty acids and upper respiratory tract infection-a prospective cohort study.
    Raposo SE; Fondell E; Ström P; Bälter O; Bonn SE; Nyrén O; Plymoth A; Bälter K · European journal of clinical nutrition · 2018
    Cohort study1,533 participantsImmunity forVitamin C
  12. Comparison of the Efficacy of Intralesional Ascorbic Acid Mesotherapy and Intralesional Tranexamic Acid in Treating Melasma in the Skin of Colour Population.
    Aslam H; Muhammad A; Ullah A; Aziz N; Lakhiar JA; Ahmad B; Shahzadi A; Ahmad A; Chandni; Virdi G · Cureus · 2025
    Randomized trial110 participantsSkin Health forVitamin C
  13. Efficacy and Safety of tranexamic acid versus vitamin c after microneedling in treatment of melasma: Clinical and Dermoscopic study.
    El Attar Y; Doghaim N; El Far N; El Hedody S; Hawwam SA · Journal of cosmetic dermatology · 2022
    Randomized trial20 participantsSkin Health forVitamin C
  14. Dietary intake and supplement use of vitamins C and E and upper respiratory tract infection.
    Fondell E; Bälter O; Rothman KJ; Bälter K · Journal of the American College of Nutrition · 2012
    Cohort study1,509 participantsImmunity forVitamin C
  15. Comparative Evaluation of Locally Injected Dexamethasone with and Without Vitamin C in Mandibular Fractures: A Randomized Controlled Trial.
    Chincholkar A; Rudagi BM; Setiya S; Sakhariya S · Journal of maxillofacial and oral surgery · 2025
    Randomized trial30 participantsSkin Health forVitamin C
  16. Vitamin C supplementation and salivary immune function following exercise-heat stress.
    Carrillo AE; Murphy RJ; Cheung SS · International journal of sports physiology and performance · 2009
    Randomized trial12 participantsImmunity forVitamin C
  17. Double-blind, half-face study comparing topical vitamin C and vehicle for rejuvenation of photodamage.
    Fitzpatrick RE; Rostan EF · Dermatologic surgery : official publication for American Society for Dermatologic Surgery [et al.] · 2002
    Non-randomized trial10 participantsSkin Health forVitamin C
  18. 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
  19. Split-Face Comparative Analysis Of Micro-Needling With Tranexamic Acid Vs Vitamin C Serum In Melasma.
    Raza MH; Iftikhar N; Anwar A; Mashhood AA; Tariq S; Bin Hamid MA · Journal of Ayub Medical College, Abbottabad : JAMC · 2022
    Non-randomized trial30 participantsSkin Health forVitamin C
  20. The effect of macronutrient and micronutrient supplements on COVID-19: an umbrella review.
    SeyedAlinaghi S; Shahidi R; Mojdeganlou H; Akhtaran FK; Maroufi SF; Maroufi SP; Mirzapour P; Karimi A; Khodaei S; Pour MM; Mehraeen E; Dadras O · Journal of health, population, and nutrition · 2024
    Systematic review28 studies pooledImmunity forVitamin C
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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
  26. 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
  27. 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
  28. 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
  29. 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
  30. 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
  31. 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
  32. 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
  33. 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
  34. 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
  35. 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
  36. 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
  37. Nutritional modulation of cataract.
    Weikel KA; Garber C; Baburins A; Taylor A · Nutrition reviews · 2014
    Narrative reviewVision Support forVitamin C
  38. 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
  39. 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