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Ester-C Plus 1000 mg Vitamin C

Solgar
4.9
★ ★ ★ ★ ★
(780 ratings)
Vitamin C 1000 mg
Flavonoid (mixture) 200 mg
Product Image
Score85
High-potency buffered Ester-C offers strong transparency and convenient dosing, though sensitive users may prefer less at once.
How scoring works
Quantity:50 Capsule(s) • (50 servings)
Goals:
General Health
Skin Health
Vision Support
Immunity
Anti-Inflammatory Support

Score 85

High-potency buffered Ester-C offers strong transparency and convenient dosing, though sensitive users may prefer less at once.
How scoring works
$14.24($0.28 per serving)
iHerb
$ 14.24
iHerb
$ 14.24
Daily Vita
$ 14.24
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Analysis

Buffered Ester-C supplies a substantial vitamin C amount while reducing the acidity associated with plain ascorbic acid. The form and amount are well aligned with users seeking a higher-potency daily capsule.

Calcium is clearly disclosed and citrus bioflavonoids add complementary plant compounds without crowding the label. The formula is easy to understand and avoids unrelated low-dose extras.

One capsule delivers the full serving, and the package offers solid value for a premium buffered form. Sensitive users may still prefer a smaller or divided amount because total vitamin C intake, not only acidity, can affect digestive tolerance.

Who is it for
  • Adults seeking high-potency buffered vitamin C
  • People who want one capsule per serving
  • Users sensitive to acidic ascorbic acid
Best for
  • Higher-potency daily vitamin C
  • Immune and antioxidant support
  • Collagen-support routines

Pros

  • Buffered Ester-C form
  • Substantial vitamin C amount
  • Calcium contribution is disclosed
  • Focused one-capsule formula

Cons

  • Amount may exceed some users' routine needs
  • Bioflavonoids are supportive rather than central
  • Less flexible than a lower-dose capsule

Warnings

  • The full serving may cause loose stools or digestive discomfort in sensitive users; dividing intake or choosing a lower amount may improve tolerance.

Nutrient quality

89 Highest impact

Ester-C provides a buffered and generally well-tolerated vitamin C form. A high-potency vitamin C amount is paired with a useful bioflavonoid dose.

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Ingredient transparency

84 Highest impact

Every listed active has a specific amount. A complete excipient list is not available in the provided data.

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Customer satisfaction

76 High impact

The average rating is very strong. The large rating volume provides a reliable satisfaction signal.

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Value for money

90 Highest impact

The serving value is competitive for a buffered capsule. The focused formula avoids unnecessary extras.

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Goals

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

Buffered vitamin C provides meaningful antioxidant, immune, and collagen support in a stomach-friendly form. Its contribution is useful but narrower than a complete foundational nutrient formula.

The 1,000 mg amount is well targeted, and the calcium contribution is clearly separated on the label. Citrus bioflavonoids complement the antioxidant theme without turning the formula into an unfocused blend.

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

Vitamin C directly supports collagen synthesis and antioxidant protection in skin. Human evidence strongly supports its essential cofactor role, although added benefit depends partly on baseline intake.

The fully disclosed amount is substantial, and buffered Ester-C may be easier on the stomach than plain ascorbic acid. Citrus bioflavonoids add a compatible antioxidant role without diluting the focused formula.

Study evidence
Vitamin C Supportive 53 studies
Vision Support
Impact
Highest effect
B+ Goal FitA+ Strength of SupportC- CoverageA+ Formula Quality
Vitamin C · 1000 mg

Natural astaxanthin provides targeted retinal antioxidant support and may help eye strain linked to prolonged screen use. Human evidence is promising for visual fatigue but less comprehensive than multi-nutrient macular formulas.

The algae source and substantial amount are clearly disclosed in a fat-containing softgel. The focused formula offers strong antioxidant depth but does not cover macular pigments, minerals, or omega fatty acids.

Immunity
Impact
Highest effect
A Goal FitA- Strength of SupportC CoverageB+ Formula Quality
Vitamin C · 1000 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 label presents a substantial 1,000 mg vitamin C serving suited to focused antioxidant support. Ascorbic acid is clearly identified, but the botanical additions do not establish enhanced absorption or buffering.

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

The full-gram Ester-C dose provides substantial antioxidant support in a buffered form that may suit sensitive stomachs. Citrus bioflavonoids add complementary antioxidant activity.

The formula supports oxidative-stress control more than direct inflammatory-enzyme pathways. Clear disclosure and a lean active list make it a strong supporting formula within that narrower role.

Study evidence
Vitamin C Supportive 50 studies

Ingredients

IngredientAmount per serving
Vitamin C (Ester-C)
1000 mg
Calcium (Ester-C Calcium Ascorbate)
108 mg
Citrus Bioflavonoids Complex
200 mg
Gluten Free Adults 18–50 Dairy Free Sugar Free
Report overview
A- Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value

Ester-C provides a buffered calcium ascorbate form that may be gentler on sensitive stomachs than straight ascorbic acid. The 1,000 mg vitamin C dose is well targeted, and the label separately discloses the calcium contribution. Its premium form is delivered at an efficient cost per gram.

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Sources

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

  1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. 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
  20. 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