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Metabolic C 500 mg

Source Naturals
4.8
★ ★ ★ ★ ★
(244 ratings)
Vitamin C 500 mg
Flavonoid 100 mg
Product Image
Score82
A simple, well-dosed vitamin C and bioflavonoid pairing offers strong everyday utility, with limited bioflavonoid detail as the main drawback.
How scoring works
Quantity:180 Capsule(s) • (180 servings)
Goals:
Immunity
General Health
Skin Health
Anti-Inflammatory Support
Vision Support

Score 82

A simple, well-dosed vitamin C and bioflavonoid pairing offers strong everyday utility, with limited bioflavonoid detail as the main drawback.
How scoring works
$18.35($0.10 per serving)
Vitacost
$ 18.35
Amazon
$ 19.23
iHerb
$ 18.46
Report prices

Analysis

Vitamin C is supplied at a practical 500 mg amount and paired with citrus bioflavonoids, creating a simple antioxidant formula. The one-capsule serving makes the product easy to fit into a routine.

PureWay-C identifies the vitamin C source, but the supplied data does not explain the carrier system or quantify any practical absorption advantage. The bioflavonoid complex is also not broken down or standardized to named compounds.

A long serving supply and focused ingredient list give the formula good practical value. It fits buyers who want vitamin C with a complementary plant compound rather than a large multi-ingredient blend.

Who is it for
  • Adults seeking a focused vitamin C supplement
  • People who want citrus bioflavonoids alongside vitamin C
Best for
  • Everyday vitamin C intake
  • Simple antioxidant support

Pros

  • Practical 500 mg vitamin C amount
  • Includes citrus bioflavonoids
  • One capsule per serving
  • Long serving supply

Cons

  • Bioflavonoids are not individually identified
  • No standardization is given for the bioflavonoid complex
  • PureWay-C delivery details are not explained

Warnings

  • Vitamin C at 500 mg may cause stomach upset or loose stools in sensitive users.

Nutrient quality

89 Highest impact

Meaningful vitamin C and bioflavonoid amounts give the focused formula good substance. Incomplete detail about the branded vitamin C form limits confidence in its absorption advantage.

Ingredient transparency

81 Highest impact

Both active amounts are disclosed and no hidden blend appears. The branded form, excipients, and full daily-use directions are not completely explained.

Customer satisfaction

66 High impact

The average rating is strong, with a moderate evidence base behind it. No specific feedback is supplied to judge repeated complaints or alignment with the intended use.

Value for money

89 Highest impact

The large supply and focused two-active formula support strong cost efficiency. Limited detail about the branded form prevents a full premium-quality judgment.

Report analysis

Goals

Immunity
Immunity
Impact
Highest effect
A Goal FitA Strength of SupportC+ CoverageA Formula Quality
Vitamin C · 500 mg

Vitamin C supplies direct antioxidant and barrier support at a meaningful daily amount. Citrus bioflavonoids provide a plausible complementary antioxidant component.

The branded vitamin C form and all amounts are clearly disclosed, although immune coverage remains narrow. A focused two-active formula avoids the dilution seen in large botanical blends.

Study evidence
Vitamin C Supportive 53 studies
General Health
General Health
Impact
Highest effect
A- Goal FitA Strength of SupportC+ CoverageA Formula Quality
Vitamin C · 500 mg

A well-sized vitamin C dose provides focused antioxidant, collagen, and immune support. The PureWay-C complex adds a clearly identified delivery feature, while citrus bioflavonoids complement the main nutrient.

Its narrow scope does not cover the wider nutritional gaps associated with general health. For someone specifically seeking vitamin C, the formulation is coherent and unusually transparent.

Study evidence
Vitamin C Supportive 56 studies
Skin Health
Skin Health
Impact
High effect
B- Goal FitA Strength of SupportD+ CoverageA- Formula Quality
Vitamin C · 500 mg

Vitamin C supports collagen synthesis and antioxidant defense but does not directly supply collagen or barrier lipids. Evidence firmly supports vitamin C as a collagen cofactor, while oral vitamin C alone has limited evidence for visible skin changes in replete users.

The vitamin C amount is well aligned for daily collagen-cofactor support. The formula uses vitamin C in a logical role without conflicting actives.

Study evidence
Vitamin C Supportive 53 studies
Anti-Inflammatory Support
Cellular Defense
Anti-Inflammatory Support
Impact
High effect
C+ Goal FitA- Strength of SupportD CoverageA Formula Quality
Vitamin C · 500 mg

Vitamin C at 500 mg provides well-targeted antioxidant support in a branded lipid-metabolite delivery complex. The enhanced form may improve uptake, but the single nutrient does not address multiple anti-inflammatory mechanisms.

Clear dosing and a focused formula make the contribution easy to assess. It is a strong vitamin C option for antioxidant support rather than a comprehensive product for this goal.

Study evidence
Vitamin C Supportive 50 studies
Vision Support
Macular and Blue Light Defense
Vision Support
Impact
High effect
F Goal FitA Strength of SupportD+ CoverageA- Formula Quality
Vitamin C · 500 mg

Vitamin C with citrus bioflavonoids provides antioxidant and vascular support relevant to ocular tissues. The formula remains narrow because it lacks lutein, zeaxanthin, omega-3s, zinc, and copper.

PureWay-C adds a branded lipid-metabolite delivery system at a strong amount. Better absorption design improves the antioxidant contribution without turning it into complete vision support.

Study evidence
Flavonoid Supportive 5 studies
Vitamin C Disputed 24 studies

Ingredients

IngredientAmount per serving
Vitamin C (PureWay-C)
 500 mg
Citrus Bioflavonoid Complex
100 mg
Gluten Free Adults 18–50 Dairy Free Sugar Free
Report overview
Vitamin C (PureWay-C) · 500 mg OverallScore88
B Active Ingredient Quality & BioavailabilityA Dose, Safety & Label TransparencyA+ Value

PureWay-C uses a lipid-metabolite delivery complex designed to improve vitamin C uptake and retention. The 500 mg serving is well targeted, though no buffered mineral form is identified. Cost per gram is exceptional for a branded advanced-delivery form.

View ingredientView products
Flavonoid · 100 mg OverallScore64
F Active Ingredient Quality & BioavailabilityB Dose, Safety & Label TransparencyA+ Value

The citrus bioflavonoid amount falls within the preferred range and offers strong cost efficiency. However, the complex does not identify individual flavonoids, standardization, or an extraction ratio. A standard capsule also lacks a delivery feature specifically shown to improve flavonoid absorption.

View ingredientView products
Loading alternative details
89 Performance

C-500 Calcium Ascorbate-C

NOW
<p>Buffered calcium ascorbate provides a practical vitamin C amount with clear calcium disclosure and a small citrus bioflavonoid addition. Compared with the incompletely explained PureWay-C form, the buffered form and mineral contribution are easier to assess.</p>
88 Performance

Sodium Ascorbate Capsules

NutriBiotic Immunity
<p>Buffered sodium ascorbate supplies a useful vitamin C amount with its sodium contribution clearly disclosed. The buffered form and clear sodium disclosure provide a more transparent alternative, though it lacks flavonoids.</p>
88 Performance

Buffered Gold C

California Gold Nutrition
<p>Buffered sodium ascorbate provides a substantial vitamin C serving in a simple, fully quantified active profile. The buffered form is more clearly characterized than the original’s branded form, though sodium intake and missing flavonoids are trade-offs.</p>
85 Budget

C-500 With Rose Hips

NOW
<p>A focused ascorbic acid serving with rose hips covers core vitamin C needs without an elaborate blend. Its lower serving cost makes it a more economical vitamin C option, though it lacks the original’s sizeable bioflavonoid complex.</p>
85 Budget

Gold C Vitamin C 1000 mg

California Gold Nutrition
<p>A simple ascorbic acid serving provides substantial vitamin C without active padding. Its lower serving cost and higher vitamin C amount favor economy, but it loses the original’s bioflavonoids and uses an unbuffered form.</p>
83 Budget

C 500 mg

21st Century
<p>A straightforward ascorbic acid serving with a small calcium addition provides focused vitamin C support. Its lower serving cost improves economy while matching the original vitamin C amount, though it omits bioflavonoids.</p>
87 Value

100% Pure Vitamin C Powder

Swanson Premium Brand
<p>Pure ascorbic acid powder provides a flexible, substantial vitamin C serving without active padding. The very large supply and simple formula provide stronger value when flexible dosing matters, though it lacks buffering and flavonoids.</p>
87 Value

C 500 mg

Mason Natural
<p>A simple ascorbic acid tablet provides a moderate vitamin C serving with no unrelated active ingredients. Its low serving cost improves value while retaining the same core vitamin C amount, but it omits flavonoids.</p>
84 Value

Ester-C 500 mg With Citrus Bioflavoinds

American Health
<p>Buffered calcium ascorbate combines a substantial vitamin C serving with a sizeable citrus bioflavonoid complex. Its buffered form and substantial bioflavonoid content improve ingredient depth while maintaining very favorable serving value.</p>
Report alternatives

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
  21. Dietary flavonoids and the prevalence and 15-y incidence of age-related macular degeneration.
    Gopinath B; Liew G; Kifley A; Flood VM; Joachim N; Lewis JR; Hodgson JM; Mitchell P · The American journal of clinical nutrition · 2019
    Cohort study2,856 participantsVision Support forFlavonoid
  22. The effect of flavonoids on visual function in patients with glaucoma or ocular hypertension: a systematic review and meta-analysis.
    Patel S; Mathan JJ; Vaghefi E; Braakhuis AJ · Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie · 2016
    Meta-analysisVision Support forFlavonoid
  23. Dietary flavonoids are associated with longitudinal treatment outcomes in neovascular age-related macular degeneration.
    Detaram HD; Liew G; Lewis JR; Bondonno NP; Bondonno CP; Van Vu K; Burlutsky G; Hodgson JM; Mitchell P; Gopinath B · European journal of nutrition · 2021
    Cohort study547 participantsVision Support forFlavonoid
  24. Dietary Flavonoid Intake and Chronic Sensory Conditions: A Scoping Review.
    Tang D; Tran Y; Shekhawat GS; Gopinath B · Antioxidants (Basel, Switzerland) · 2025
    Scoping review10 studies pooledVision Support forFlavonoid
  25. Effects of Flavonoid Supplementation on Common Eye Disorders: A Systematic Review and Meta-Analysis of Clinical Trials
    Sergio Davinelli, Sawan Ali, Giovanni Scapagnini, Ciro Costagliola · Frontiers in Nutrition · 2021
    Meta-analysis724 participants11 studies pooledVision Support forFlavonoid
  26. 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
  27. 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
  28. Nutritional modulation of cataract.
    Weikel KA; Garber C; Baburins A; Taylor A · Nutrition reviews · 2014
    Narrative reviewVision Support forVitamin C
  29. 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
  30. 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