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Liquid Vitamin C 1000 mg Natural Citrus Flavors

4.6
★ ★ ★ ★ ★
(2069 ratings)
Vitamin C 6660 mg
Product Image
Score48

A convenient liquid vitamin C option undermined by conflicting dose and carbohydrate entries. Verify the current label before deciding how much to take.

How scoring works
Liquid
Quantity:16 Fluid Ounce(s) • (32 servings)
Goals:
Vision Support
Anti-Inflammatory Support
Immunity
Skin Health

Score 48

A convenient liquid vitamin C option undermined by conflicting dose and carbohydrate entries. Verify the current label before deciding how much to take.

How scoring works
$13.39($0.41 per serving)
iHerb
$ 13.39
Vitacost
$ 13.39
Pure Formulas
$ 13.39
Amazon
$ 13.39
Vitacost
$ 13.39
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Analysis

The liquid format may suit people who prefer not to swallow tablets or capsules. One listed serving provides 1,000 mg of vitamin C for focused antioxidant, immune, and collagen support.

The supplied data also list a much larger vitamin C amount and a separate carbohydrate amount, creating serious serving ambiguity. Neither the vitamin C form nor a stabilization or delivery system is identified.

Natural citrus flavor may improve usability, but the formula cannot be assessed confidently until the serving panel is clarified. It is a narrow vitamin C product and does not provide the complementary nutrients needed for broad vision or skin support.

Who is it for
  • People who avoid tablets and capsules
  • Adults preferring flavored liquids
  • Users willing to verify the serving panel
Best for
  • Liquid vitamin C delivery
  • Antioxidant support
  • Immune and collagen support

Pros

  • Easy-to-take liquid format
  • Provides a substantial listed vitamin C serving
  • Natural citrus flavor
  • Focused nutritional role

Cons

  • Conflicting vitamin C amounts
  • Conflicting carbohydrate entries
  • Vitamin C form is unspecified
  • No disclosed stabilization system

Warnings

  • Verify the current serving panel because the supplied vitamin C amounts conflict
  • A 1,000 mg or larger serving may cause stomach upset or diarrhea
  • People prone to calcium-oxalate kidney stones should discuss regular high-dose use with a clinician
  • People tracking carbohydrates should confirm which listed amount applies per serving

Nutrient quality

40 Lower impact

Vitamin C fits the intended use, but its form and effective amount are unclear. Conflicting quantities and a carbohydrate-heavy carrier create dosing and formula-quality concerns.

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Ingredient transparency

47 Lower impact

The label names vitamin C and avoids a proprietary blend. Conflicting quantities, generic form naming, unclear serving details, and absent excipient data substantially weaken disclosure.

.

Customer satisfaction

68 High impact

The aggregate rating is strong and supported by solid feedback volume. Complaint-level experiences are unavailable, so repeated drawbacks and purpose fit remain uncertain.

.

Value for money

40 Lower impact

The cost per useful serving is high relative to the documented formula quality. Unclear delivery or low-value additions further weaken category competitiveness.

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Report analysis

Goals

Vision Support
Vision Support
Impact
High effect
C Goal FitB Strength of SupportD CoverageB Formula Quality
Vitamin C · 6660 mg

Vitamin C provides meaningful antioxidant support for the lens and other ocular tissues. The disclosed amount is substantial enough to contribute rather than merely decorate the label.

Its strongest vision evidence comes from use within broader nutrient combinations. The formula does not supply macular carotenoids, retinal omega-3s, or balanced zinc and copper.

Study evidence
Vitamin C Disputed 24 studies
Anti-Inflammatory Support
Anti-Inflammatory Support
Impact
High effect
C Goal FitB Strength of SupportD+ CoverageB Formula Quality
Vitamin C · 6660 mg

A meaningful vitamin C dose offers focused antioxidant support that may help limit oxidative stress linked with inflammatory signaling. Its role is indirect, so it does not provide the targeted pathway coverage of curcumin, boswellia, or omega-3 fats.

The simple liquid formula is easy to understand, but the label does not identify a specialized vitamin C form or absorption system. A one-gram serving may cause stomach upset or diarrhea in sensitive users, and people prone to calcium oxalate kidney stones should discuss regular high-dose use with their clinician.

Study evidence
Vitamin C Supportive 50 studies
Immunity
Immunity
Impact
High effect
A- Goal FitC- Strength of SupportD+ CoverageD+ Formula Quality
Vitamin C · 6660 mg

Vitamin C can directly support immune-cell function and antioxidant defenses, and one listed serving provides the goal-target amount. Liquid delivery may suit people who prefer not to swallow tablets.

The input lists conflicting vitamin C and carbohydrate amounts, so the actual serving cannot be judged confidently. A high-sugar version would add unnecessary carbohydrate without improving immune support.

Study evidence
Vitamin C Supportive 53 studies
Skin Health
Skin Health
Impact
High effect
B- Goal FitC Strength of SupportC- CoverageC+ Formula Quality
Vitamin C · 6660 mg

Vitamin C directly supports collagen synthesis but addresses only one primary skin pathway. Vitamin C has established collagen and antioxidant roles, though benefits depend on baseline intake.

The standard serving appears to provide a substantial amount, but duplicate label entries create dose ambiguity. The liquid form is easy to take, yet no buffering or stabilization system is disclosed and carbohydrates reduce simplicity.

Study evidence
Vitamin C Supportive 53 studies
General Health
General Health
Impact
Moderate effect
A- Goal FitD- Strength of SupportD- CoverageD+ Formula Quality
Vitamin C · 6660 mg

Vitamin C supports antioxidant defenses, collagen formation, and normal immune function. A liquid format can be convenient for people who avoid tablets.

The supplied data lists two very different vitamin C amounts and two carbohydrate entries, so the actual serving is unclear. That conflict prevents a confident judgment of dose and daily suitability.

Study evidence
Vitamin C Supportive 56 studies

Ingredients

IngredientAmount per serving
Calories
70 Calorie(s)
Total Carbohydrates
18 Gram(s)
Vitamin C
6660 mg
Gluten Free Adults 18–50 Kosher Halal Vegetarian
Report overview
Vitamin C · 6660 mg OverallScore41
F Active Ingredient Quality & BioavailabilityC+ Dose, Safety & Label TransparencyD- Value

The liquid supplies a useful serving amount, but neither the vitamin C form nor a stabilization method is identified. A carbohydrate-heavy carrier and conflicting vitamin C quantities in the supplied panel reduce confidence in purity and label clarity. Value is only middling for a conventional liquid without disclosed delivery technology.

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 1000 mg liquid 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 1000 mg liquid 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 1000 mg liquid 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 1000 mg liquid 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

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 1000 mg liquid formula. the simple buffered formula provides a full amount with no unrelated active ingredients, although the sodium contribution needs consideration on a restricted diet.
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 1000 mg liquid formula. the fully buffered powder provides a substantial, clearly disclosed amount, although careful measuring and sodium accounting remain important.
87 Value

Pure Buffered Magnesium Ascorbate

NOW
A stronger quality-to-cost balance comes from 820 mg of vitamin C as magnesium ascorbate with 60 mg of magnesium. Compared with the original 1000 mg liquid formula, full buffering combines a meaningful vitamin C amount with clear mineral disclosure, while complete use directions and inactive ingredients are not supplied.
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 1000 mg liquid 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.
87 Value

100% Pure Vitamin C Powder

Swanson Premium Brand
A stronger quality-to-cost balance comes from 1,000 mg of pure ascorbic acid in a flexible powder. Compared with the original 1000 mg liquid formula, the single-active formula provides a full vitamin C amount without decorative ingredients, while plain ascorbic acid may be less comfortable for sensitive stomachs.
Report alternatives

Sources

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

  1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. 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
  20. 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
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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
  26. 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
  27. Nutritional modulation of cataract.
    Weikel KA; Garber C; Baburins A; Taylor A · Nutrition reviews · 2014
    Narrative reviewVision Support forVitamin C
  28. 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
  29. 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