$34.99 $0.15 per serving
Product analysis
Ester-C 500 mg offers good-value vitamin C for normal immune function, antioxidant defenses and collagen formation, especially when intake is low.
AI assessment of the formula, label and price. How scoring works
Nutrient Quality37
Vitamin C and calcium are identified as calcium ascorbate, while the flavonoid preparation is unclear. The information available does not establish an added absorption or quality advantage for Ester-C.
Ingredient Transparency88
The amounts are disclosed, and the vitamin C and calcium forms are identified. The flavonoid form is the main remaining label gap.
Value For Money74
The vitamin C comparison indicates good value for the amount provided. The added calcium and flavonoids do not have reliable separate value comparisons.
Customer Satisfaction96
Customer satisfaction is exceptionally positive across a very large review base. That broad feedback is informative about satisfaction, though it does not prove immune or skin benefits.
Product Focus74
Vitamin C is the main focus, supporting normal immune function, antioxidant defenses and collagen formation. Extra benefits with adequate intake, or added benefits from Ester-C and flavonoids, are not established.
- Format
Tablet - Container
- 450 Tablet(s)
- Per serving
- $0.15
- Also available
Ester-C 500 mg With Citrus Bioflavoinds$9.16- Customer rating
- 4.9 · 17,215 ratings
Goals
Impact
Highest effect
Vitamin C · 1000 mg
Vitamin C supports normal immune-cell activity, and regular supplementation may modestly shorten colds without establishing infection prevention. The supplied serving provides a meaningful amount; its form has no established advantage over ordinary vitamin C. Ester-C and accompanying bioflavonoids do not establish additional immune benefit.
How this product is rated for Immunity
Ingredient fit80
Immune-related nutrients sit alongside ingredients intended for other nutritional goals, making this a broader formula. The declared serving reaches the saved amount comparison; that comparison does not establish an optimal dose.
Goal fit
Immune-related nutrients sit alongside ingredients intended for other nutritional goals, making this a broader formula.
Dose adequacy
The declared serving reaches the saved amount comparison; that comparison does not establish an optimal dose.
Pathways60
The strongest saved connection is early immune-cell activity. The ingredient roles support this connection without proving infection protection.
Depth
The strongest saved connection is early immune-cell activity. The ingredient roles support this connection without proving infection protection.
Breadth
One immune function reaches the saved coverage threshold, so the contribution is relatively narrow.
Evidence100
Vitamin C supplies the strongest saved evidence connection; its supported role does not establish broad infection prevention.
Evidence strength
Vitamin C supplies the strongest saved evidence connection; its supported role does not establish broad infection prevention.
Studied preparation
The saved preparation matching is favorable; it does not establish superiority over other nutrient forms.
Formulation logic100
The partner requirements are met and neither specified zinc conflict applies. Amount completeness remains a separate consideration.
Partner coverage
The included ingredients require no missing partner under the supplied findings; this does not imply extra benefit from combining them.
Conflicts
Neither specified zinc conflict applies to the supplied facts; these checks do not establish overall safety.
Effective doses
All included ingredients counted here meet the saved minimum amount comparison; this is not proof of clinical effectiveness.
Impact
High effect
Vitamin C · 1000 mg
Vitamin C supplies a nutrient relevant to normal antioxidant and immune functions when intake is low. The selected serving contains 1000 mg and receives full saved amount credit; the product name does not change that serving basis. The supplied information does not establish extra benefit from Ester-C, infection prevention or broader disease protection.
How this product is rated for Everyday Health
Ingredient fit80
The relevant ingredient contribution sits alongside other actives without a supported contribution to this goal. The relevant amount receives the full saved comparison finding; this does not establish extra benefit above adequate intake.
Goal fit
The relevant ingredient contribution sits alongside other actives without a supported contribution to this goal.
Dose adequacy
The relevant amount receives the full saved comparison finding; this does not establish extra benefit above adequate intake.
Pathways54
Antioxidant and immune defence account for the relevant functional coverage. The contribution is concentrated in one area rather than broad coverage.
Depth
Antioxidant and immune defence provide the strongest saved functional finding.
Breadth
The contribution is concentrated in one area rather than broad coverage.
Evidence74
Vitamin C provides the main evidence finding, with benefits limited to the roles and conditions described.
Evidence strength
Vitamin C provides the main evidence finding, with benefits limited to the roles and conditions described.
Studied preparation
The saved preparation finding is positive for the ingredients meeting its amount comparison; no special form advantage is established.
Formulation logic100
No matched ingredient conflict was identified in the saved findings. The credited ingredients do not require a missing partner for their saved contribution.
Partner coverage
The credited ingredients can contribute independently or have the partners recognized by the saved findings.
Conflicts
No matched ingredient conflict was identified in the saved findings.
Effective doses
The credited ingredients meet the saved minimum amount criterion, which does not establish a proven clinical dose.
Impact
High effect
Vitamin C · 1000 mg
Vitamin C supports collagen formation and helps restore impaired wound healing when intake is low. Extra vitamin C has no established skin benefit when intake is adequate. The calcium ascorbate form does not establish an additional cosmetic benefit.
How this product is rated for Skin Health
Ingredient fit73
The relevant skin ingredients sit within a broader formula serving other purposes. The declared amount reaches the saved amount benchmark; this does not establish additional cosmetic benefit.
Goal fit
The relevant skin ingredients sit within a broader formula serving other purposes.
Dose adequacy
The declared amount reaches the saved amount benchmark; this does not establish additional cosmetic benefit.
Pathways0
The contribution concerns nutritional support rather than demonstrated coverage of collagen structure, hydration, barrier lipids or UV-response outcomes.
Depth
The contribution concerns nutritional support rather than demonstrated coverage of collagen structure, hydration, barrier lipids or UV-response outcomes.
Breadth
No skin outcome pathway reaches the saved coverage threshold.
Evidence100
Vitamin C leads the saved evidence findings; its clearest skin role is correcting low intake, rather than improving already adequate nutrition.
Evidence strength
Vitamin C leads the saved evidence findings; its clearest skin role is correcting low intake, rather than improving already adequate nutrition.
Studied preparation
The saved findings recognize the declared forms; form recognition does not prove extra cosmetic benefit from these nutrients.
Formulation logic100
The credited ingredients have no unmet partner requirement or matched conflict in the saved findings. Their amounts pass the saved minimum inclusion check.
Partner coverage
The credited ingredients are treated as able to contribute independently or as having their required partner.
Conflicts
No configured ingredient conflict was matched in the supplied findings.
Effective doses
The credited ingredient amounts pass the saved minimum inclusion check; this is not a proven effective skin dose.
Impact
High effect
Vitamin C · 1000 mg
Vitamin C contributes to antioxidant defenses. Its inflammatory-marker evidence is most relevant when baseline inflammation is elevated: the supplied trial was null overall and showed improvement in that subgroup. This does not establish added routine anti-inflammatory benefit in people with adequate intake. Rutin presence and amount remain unresolved.
How this product is rated for Inflammation
Ingredient fit73
Vitamin C carries the main relevant contribution. The selected amount is substantial within the saved comparison.
Goal fit
Vitamin C provides the main relevant contribution; other actives make the formula less focused on this goal.
Dose adequacy
The selected serving supplies a substantial amount for the saved comparison, without proving a clinical effect.
Pathways55
The recorded contribution centers on oxidative and mitochondrial stress. Other inflammatory processes have less coverage.
Depth
The strongest recorded connection is to oxidative and mitochondrial stress, without establishing that these processes will change clinically.
Breadth
One main area carries the recorded contribution; support does not extend broadly across the other inflammatory processes.
Evidence87
Vitamin C leads the evidence findings, with important limits in the populations, markers or preparations studied.
Evidence strength
Vitamin C leads the saved evidence findings, but the supplied human results remain limited or context dependent.
Studied preparation
The saved findings recognize the contributing preparation; this does not establish that the selected serving reproduces the studied regimen.
Formulation logic100
The retained ingredients can contribute without a missing partner, and no configured conflict was found.
Partner coverage
The contributing ingredients do not require a missing partner in the saved findings.
Conflicts
No configured ingredient conflict was identified in the supplied calculation.
Effective doses
The ingredients retained as meaningful contributions clear the saved amount threshold; this is not proof of a clinical effect.
Impact
High effect
Vitamin C · 1000 mg
Vitamin C contributes to antioxidant nutrition relevant to the eye. Its clinical vision evidence comes from a defined combination used in selected people with age-related macular degeneration, so this product does not establish improved routine visual performance from vitamin C alone. The declared calcium ascorbate provides a substantial vitamin C amount, while rutin's presence and dose remain unresolved.
How this product is rated for Eye Health
Ingredient fit73
Vitamin C provides the main contribution to the saved findings, with other ingredients serving broader purposes.
Goal fit
Vitamin C is the main relevant ingredient in the saved comparison.
Dose adequacy
Vitamin C reaches the full comparison amount; unresolved rutin cannot add a known contribution.
Pathways47
The recorded contribution is concentrated in retinal and lens antioxidant defense.
Depth
Retinal and lens antioxidant defense is the strongest recorded area.
Breadth
Only antioxidant defense is prominently covered; macular pigment, focusing, circulation and the visual cycle have no recorded contribution.
Evidence68
Vitamin C leads the saved evidence comparison, but the supplied clinical context limits routine vision claims.
Evidence strength
Vitamin C leads the saved comparison; its clinical vision evidence concerns a defined combination in selected macular-degeneration populations.
Studied preparation
Vitamin C meets the saved preparation criteria; that does not establish routine visual-performance benefit.
Formulation logic100
Vitamin C reaches meaningful comparison amounts without a required missing partner or matched conflict.
Partner coverage
No required partner is missing under the saved rules; this does not establish a complete clinical eye-health regimen.
Conflicts
No configured ingredient conflict was identified in the supplied facts.
Effective doses
Vitamin C reaches a meaningful amount in the saved comparison.
Ingredients
| Ingredient | Amount per serving | Score |
|---|---|---|
Vitamin C (Ester-C Calcium Ascorbate) | 1000 mg | |
Calcium (Ester-C Calcium Ascorbate) | 110 mg | |
Citrus Bioflavonoids Complex | 400 mg |
Vitamin C (Ester-C Calcium Ascorbate) · 1000 mg OverallScore92
Each serving provides 1,000 mg of vitamin C as Ester-C calcium ascorbate, a buffered mineral form. The whole-product serving costs about $0.16.
How this ingredient is rated
Active Ingredient Quality & Bioavailability90
Ester-C is a calcium ascorbate form that the evaluation treats as buffered.
Vitamin C Chemical Form & Delivery System
Vitamin C is supplied as Ester-C, a calcium ascorbate preparation.
Gastric Comfort & pH Balance
The evaluation treats this mineral ascorbate as buffered.
Dose, Safety & Label Transparency91
Each serving provides 1000 mg of vitamin C. The amount is recorded in the saved facts.
Optimal Dosage Targeting
A serving provides 1000 mg of vitamin C.
Purity & Excipient Quality
Standard excipients are recorded in the available ingredient evidence.
Mineral & Source Transparency
The vitamin C amount and a matching calcium amount are recorded; the mineral amount is for the serving.
Value100
The whole product costs about $0.16 per serving for 1000 mg of vitamin C.
Price per Gram of Vitamin C
Based on the whole-product serving price, the cost is about $0.16 per gram of vitamin C.
Alternative products
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Sources
Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.
- 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.
- 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.
- Vitamin C Depletion and All-Cause Mortality in Renal Transplant Recipients.
- 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.
- 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.
- Role of Oral Vitamin 'C' on Astigmatic Errors in Phacoemulsification.
- Ascorbic acid metabolites are involved in intraocular pressure control in the general population.
- Nutritional modulation of cataract.
- Dietary n-3 Fatty Acid, α-Tocopherol, Zinc, vitamin D, vitamin C, and β-carotene are Associated with Age-Related Macular Degeneration in Japan.
- Adherence to a Mediterranean diet, lifestyle and age-related macular degeneration: the Coimbra Eye Study - report 3.
- 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.
- Therapeutic effects of high-dose vitamin C supplementation in patients with COVID-19: a meta-analysis.
- Effect of micronutrient supplements on influenza and other respiratory tract infections among adults: a systematic review and meta-analysis.
- New evidence for antioxidant properties of vitamin C.
- Enhanced Vitamin C Delivery: A Systematic Literature Review Assessing the Efficacy and Safety of Alternative Supplement Forms in Healthy Adults.
- Efficacy of Vitamin C as Glucocorticoid Substitute for Reducing Pain and Inflammation After Total Hip Arthroplasty: A Randomized Controlled Trial.
- The Impact of Vitamin C on Analgesic, Anti-inflammatory, and Hemostatic Outcomes After Total Hip and Knee Arthroplasty: A Systematic Review and Meta-Analysis.
- The impact of vitamin C supplementation on the perioperative outcomes after total hip and knee arthroplasty: a systematic review and meta-analysis.
- Therapeutic Impact of Ascorbic Acid on Oral and Periodontal Tissues: A Systematic Literature Review.
- Oral vitamin C administration reduces early recurrence rates after electrical cardioversion of persistent atrial fibrillation and attenuates associated inflammation.