$11.10 $0.44 per serving
Product analysis
Quercetin Complex provides vitamin C to support normal immune function and collagen formation, particularly when intake is low. Quercetin’s additional immune contribution remains uncertain.
AI assessment of the formula, label and price. How scoring works
Nutrient Quality31
Vitamin C names its source, but its comparative quality remains uncertain. Quercetin and the flavonoids do not identify exact forms, limiting comparisons further.
Ingredient Transparency75
All three ingredient amounts are stated, making the serving easy to check. Only vitamin C identifies its form, leaving the other sources less clear.
Value For Money55
Vitamin C offers moderate value, while the flavonoid contribution appears reasonably priced. Quercetin’s value remains uncertain, so the combination’s full value is less clear.
Customer Satisfaction81
Customers report high satisfaction across more than a thousand ratings. That provides a substantial basis for understanding the customer experience.
Product Focus76
Vitamin C provides the clearest support for normal immune, antioxidant and collagen functions. The other ingredients do not establish extra protection or routine inflammation relief.
- Format
Capsule - Container
- 50 Capsule(s)
- Per serving
- $0.44
- Customer rating
- 4.7 · 1,283 ratings
Goals
Impact
Highest effect
Vitamin C · 1000 mg
Vitamin C supports immune-cell activity and may modestly shorten colds when used regularly. Quercetin has limited respiratory evidence from small trials in stressed athletes, so its presence does not establish extra protection for other adults. The accompanying bioflavonoids do not establish an additional contribution beyond declared vitamin C.
How this product is rated for Immunity
Ingredient fit94
Vitamin C gives the formula a clear immune-related focus. The declared serving reaches the saved amount comparison; that comparison does not establish an optimal dose.
Goal fit
Vitamin C gives the formula a clear immune-related focus.
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
Neither specified zinc conflict applies to the supplied facts; these checks do not establish overall safety.
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 provides the supported nutritional contribution to normal antioxidant and immune functions. Its amount reaches the supplied comparison endpoint and can help fill a dietary gap. The other named ingredients do not establish an independent contribution in the supplied findings, and the vitamin C amount does not show added protection when intake is adequate.
How this product is rated for Everyday Health
Ingredient fit73
Vitamin C provide the relevant connection. Their amounts make nutritional contributions of varying size.
Goal fit
The meaningful connection comes from vitamin c; product naming and broader uses do not establish extra benefit.
Dose adequacy
The declared amount reaches the supplied comparison endpoint, without proving extra benefit above adequate nutrition.
Pathways54
The relevant areas are antioxidant and immune functions. The contribution is concentrated in one area.
Depth
The strongest contribution concerns antioxidant and immune functions.
Breadth
The contribution is concentrated in one area.
Evidence74
Vitamin C leads the saved finding. The supported role remains nutritional, without established added benefit above adequate intake.
Evidence strength
Vitamin C provides the leading evidence contribution, subject to the supplied population and nutritional limits.
Studied preparation
The included preparations satisfy the supplied comparison; the finding does not establish superior effects from named forms or delivery methods.
Formulation logic100
No configured ingredient conflict was identified; this finding does not establish overall safety. The included ingredients meet the amount threshold and have no missing required partner.
Partner coverage
The included ingredients work independently or have their required partner; no extra combination benefit follows.
Conflicts
No configured ingredient conflict was identified; this finding does not establish overall safety.
Effective doses
The included ingredients meet the saved amount threshold; this does not prove clinical effectiveness.
Impact
High effect
Vitamin C · 1000 mg
Vitamin C helps protect cells from oxidative stress. Its supplied trial was null overall, with a CRP reduction only in people starting with elevated CRP. This limits expectations for routine anti-inflammatory benefit; buffered or Ester-C forms do not establish an advantage. Quercetin's larger trial was mostly null, leaving added benefit uncertain.
How this product is rated for Inflammation
Ingredient fit80
Relevant ingredients share the formula with broader uses, giving it a mixed focus on inflammation. The counted amount reaches the saved comparison range; this does not establish a proven effective regimen.
Goal fit
Relevant ingredients share the formula with broader uses, giving it a mixed focus on inflammation.
Dose adequacy
The counted amount reaches the saved comparison range; this does not establish a proven effective regimen.
Pathways55
The strongest saved finding concerns oxidative stress, which does not itself establish clinical inflammation relief. Only oxidative stress reaches the saved coverage threshold.
Depth
The strongest saved finding concerns oxidative stress, which does not itself establish clinical inflammation relief.
Breadth
Only oxidative stress reaches the saved coverage threshold.
Evidence87
Vitamin C leads the saved evidence finding, but the scientific context limits claims of routine clinical benefit. Recognized preparation matching does not remove those limitations.
Evidence strength
Vitamin C leads the saved evidence finding, but the scientific context limits claims of routine clinical benefit.
Studied preparation
The counted preparations match those recognized in the saved findings; the supplied population and outcome limitations still apply.
Formulation logic100
Counted ingredients meet the saved amount threshold and partner requirements, with no configured conflict identified. These findings do not establish synergy or comprehensive safety.
Partner coverage
The counted ingredients work independently or have their required partner in the saved findings.
Conflicts
No configured ingredient conflict was identified; this does not assess every possible interaction.
Effective doses
All counted ingredients clear the saved amount threshold, a comparison rule rather than a proven effective dose.
Impact
High effect
Vitamin C · 1000 mg
Vitamin C helps form collagen and supports normal wound healing. Its clearest skin benefit is correcting low intake; extra vitamin C has not been shown to improve skin when intake is adequate. The declared form does not establish additional cosmetic benefit.
How this product is rated for Skin Health
Ingredient fit73
Skin-related ingredients are part of a broader formula. Disclosed amounts explain the retained findings, while unresolved ingredient facts limit additional conclusions.
Goal fit
Relevant skin ingredients appear in a broader formula with other actives, giving a partial focus on this goal.
Dose adequacy
Serving amounts provide the retained amount findings; larger amounts do not automatically mean greater skin benefit.
Pathways0
No selected structural, water-binding, barrier-lipid or UV-related pathway receives coverage in the saved findings.
Depth
No selected structural, water-binding, barrier-lipid or UV-related pathway receives coverage in the saved findings.
Breadth
None of the selected pathways reaches the coverage threshold.
Evidence100
Vitamin C leads the retained evidence finding, with a clear role in normal collagen formation and correcting low intake.
Evidence strength
Vitamin C leads the retained evidence finding, with a clear role in normal collagen formation and correcting low intake.
Studied preparation
Retained ingredients meet the preparation check, but the complete formula is not thereby established as equivalent to a skin trial.
Formulation logic100
No partner gaps or conflicts were identified. All retained ingredients meet the amount threshold, without establishing a proven daily skin-treatment regimen.
Partner coverage
The retained ingredients work independently or have their required partner, without demonstrated extra combination benefit.
Conflicts
No conflicts were identified by the evaluated ingredient checks.
Effective doses
All retained ingredients meet the amount threshold, without establishing a proven daily skin-treatment regimen.
Impact
High effect
Vitamin C · 1000 mg
Vitamin C has antioxidant functions, but its vision evidence concerns a defined AREDS combination in selected people with macular degeneration. This does not establish that vitamin C alone improves everyday visual performance or prevents eye disease.
How this product is rated for Eye Health
Ingredient fit72
The counted ingredients have varying relevance and amounts. Nutrient functions and disease-specific combinations do not establish routine visual improvement.
Goal fit
Other actives and multiple health purposes limit how concentrated this formula is on the ingredients counted for vision.
Dose adequacy
The counted amounts provide partial coverage of the saved references; unknown amounts provide no amount contribution.
Pathways47
The strongest saved coverage concerns retinal and lens antioxidant defense. Coverage remains distinct from a measured visual outcome.
Depth
The strongest saved coverage concerns retinal and lens antioxidant defense. This mechanistic coverage is distinct from demonstrated visual improvement.
Breadth
The saved coverage reaches retinal and lens antioxidant defense, while other vision routes remain less covered.
Evidence78
Flavonoids lead the saved finding, but the broad class does not identify a preparation with established routine visual benefits.
Evidence strength
Flavonoids lead the saved finding, but the broad class does not identify a preparation with established routine visual benefits.
Studied preparation
The saved preparation check is satisfied for the counted ingredients, without extending disease-specific combinations to routine vision improvement.
Formulation logic100
No ingredient conflict was matched in the supplied findings. Partner requirements are met under the saved findings.
Partner coverage
The counted ingredients work independently or meet their partner requirements in the saved findings; this does not establish a complete AREDS regimen.
Conflicts
No ingredient conflict was matched in the supplied findings.
Effective doses
All counted ingredients pass the saved minimum amount threshold, which is not a proven clinical vision-benefit dose.
Ingredients
| Ingredient | Amount per serving | Score |
|---|---|---|
Vitamin C (Ascorbic Acid) | 1000 mg | |
Quercetin | 500 mg | |
Citrus Bioflavonoid Complex | 66 mg |
Flavonoid · 66 mg OverallScore62
Each serving declares 66 mg of flavonoid ingredient. The whole-product price works out to about $0.67 per 100 mg of the declared ingredient.
How this ingredient is rated
Active Ingredient Quality & Bioavailability20
The flavonoid preparation and active-marker concentration are not established in the available facts.
Standardization and Active Marker Disclosure
The available facts do not establish a flavonoid marker percentage, extract ratio, or raw-powder source.
Bioavailability and Delivery Technology
The available facts do not identify specialized delivery technology or a secondary absorption enhancer.
Dose, Safety & Label Transparency100
The declared flavonoid ingredient amount is 66 mg per serving; it does not establish individual compound amounts.
Declared Flavonoid Ingredient Amount
Each serving declares 66 mg of flavonoid ingredient.
Label Transparency and Blend Clarity
The 66 mg aggregate amount per serving is disclosed; individual flavonoid amounts are not established.
Value70
The whole-product price works out to about $0.67 per 100 mg of declared flavonoid ingredient.
Price per 100mg Declared Flavonoid Ingredient
The whole-product price works out to about $0.67 per 100 mg of declared flavonoid ingredient.
Vitamin C (Ascorbic Acid) · 1000 mg OverallScore58
Each serving provides 1,000 mg of vitamin C as ascorbic acid. The whole-product serving price works out to about $0.44 per 1,000 mg of vitamin C.
How this ingredient is rated
Active Ingredient Quality & Bioavailability30
Vitamin C is ascorbic acid, which the evaluation treats as unbuffered.
Vitamin C Chemical Form & Delivery System
Vitamin C is supplied as ascorbic acid, a standard form.
Gastric Comfort & pH Balance
The evaluation treats ascorbic acid as unbuffered.
Dose, Safety & Label Transparency91
Each serving provides 1,000 mg of vitamin C. Standard excipients are identified in the product.
Optimal Dosage Targeting
Each serving provides 1,000 mg of vitamin C.
Purity & Excipient Quality
The evaluation identifies standard excipients in the product.
Mineral & Source Transparency
The amount of vitamin C is 1000 mg per serving, and its source is identified as ascorbic acid.
Value50
The whole-product serving price works out to about $0.44 per 1,000 mg of vitamin C.
Price per Gram of Vitamin C
The whole-product serving price works out to about $0.44 per 1,000 mg of vitamin C.
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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.
- Dietary flavonoids and the prevalence and 15-y incidence of age-related macular degeneration.
- The effect of flavonoids on visual function in patients with glaucoma or ocular hypertension: a systematic review and meta-analysis.
- Dietary flavonoids are associated with longitudinal treatment outcomes in neovascular age-related macular degeneration.
- Dietary Flavonoid Intake and Chronic Sensory Conditions: A Scoping Review.
- Effects of Flavonoid Supplementation on Common Eye Disorders: A Systematic Review and Meta-Analysis of Clinical Trials
- 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.