Product Image

Reacta C 500 mg

Solaray
4.9
★ ★ ★ ★ ★
(4985 ratings)
Vitamin C 500 mg
Flavonoid (mixture) 200 mg
Product Image
Score83
A convenient buffered vitamin C capsule offers good everyday support, but incomplete mineral disclosure reduces transparency.
How scoring works
Quantity:60 VegCap(s) • (60 servings)
Goals:
Immunity
Skin Health
General Health
Anti-Inflammatory Support

Score 83

A convenient buffered vitamin C capsule offers good everyday support, but incomplete mineral disclosure reduces transparency.
How scoring works

Also available as

2 options
180 servings Flavonoid (mixture) 200 mg, C 500 mg • 180 VegCap(s) • 180 servings $27.29 ($0.15 per serving) 120 servings Flavonoid (mixture) 200 mg, C 500 mg • 120 VegCap(s) • 120 servings $20.09 ($0.16 per serving)
$10.69($0.17 per serving)
Vitacost
$ 10.69
Pure Formulas
$ 10.69
iHerb
$ 10.69
iHerb
$ 10.69
Report prices

Analysis

Calcium and strontium ascorbates create a buffered vitamin C base that should be gentler than plain ascorbic acid for many users. The amount is practical for regular immune, collagen, and antioxidant support.

A clearly stated citrus bioflavonoid concentrate adds useful formulation depth. The additional support base is small and not fully explained, so it contributes less confidence than the named core ingredients.

The one-capsule serving is convenient and the supply is easy to trial. Elemental calcium and strontium are not disclosed separately, which matters for people tracking mineral intake or specifically avoiding supplemental strontium.

Who is it for
  • Adults wanting buffered vitamin C
  • People who prefer one capsule per serving
  • Users seeking citrus bioflavonoids
Best for
  • Routine immune support
  • Collagen and skin support
  • Sensitive-stomach vitamin C use

Pros

  • Buffered mineral ascorbate forms
  • Practical vitamin C amount
  • Useful citrus bioflavonoid concentrate
  • Convenient single capsule

Cons

  • Elemental calcium is not separated
  • Elemental strontium is not separated
  • Support base is not fully described

Warnings

  • People limiting supplemental strontium should note that strontium ascorbate is included without a separately stated elemental amount.

Nutrient quality

87 Highest impact

Calcium ascorbate provides a buffered and generally well-tolerated vitamin C form. The combined vitamin C and citrus concentrate amounts are meaningful.

.

Ingredient transparency

77 High impact

The principal vitamin C and bioflavonoid amounts are disclosed. A complete excipient list is not available in the supplied data.

.

Customer satisfaction

78 High impact

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

.

Value for money

89 Highest impact

The bottle provides economical servings for a buffered product. The small support base is the only questionable extra.

.
Report analysis

Goals

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

Buffered mineral ascorbates provide a meaningful Vitamin C amount for immune-cell and antioxidant support. The form should be gentler than plain ascorbic acid, and a substantial bioflavonoid addition reinforces the antioxidant theme.

Elemental calcium and strontium contributions are not separately disclosed, which limits mineral transparency. The formula remains focused and offers stronger delivery quality than basic Vitamin C.

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

Buffered vitamin C directly supports collagen synthesis and antioxidant defense, while citrus bioflavonoids add complementary protection. Evidence for vitamin C is well established, although the formula does not cover hydration or barrier lipids.

The 500 mg vitamin C serving and 200 mg bioflavonoid concentrate are meaningful and fully stated. Calcium and strontium ascorbates should be gentler than plain ascorbic acid, though their separate mineral contributions are not disclosed.

Study evidence
Vitamin C Supportive 53 studies
General Health
General Health
Impact
High effect
B+ Goal FitA- Strength of SupportC CoverageB+ Formula Quality
Vitamin C · 500 mg

Buffered vitamin C provides focused antioxidant and collagen support with a practical daily amount. Citrus bioflavonoids add a sensible complementary component.

The named ascorbate forms should be gentler on the stomach than plain ascorbic acid. The formula is narrow, but it delivers its main foundational function with good clarity and little padding.

Study evidence
Vitamin C Supportive 56 studies
Anti-Inflammatory Support
Cellular Defense
Anti-Inflammatory Support
Impact
High effect
B Goal FitA- Strength of SupportC CoverageA- Formula Quality
Vitamin C · 500 mg

Buffered vitamin C and citrus bioflavonoids create a focused antioxidant formula that may help limit oxidative stress. The active vitamin amount is meaningful, and buffered ascorbate forms may improve tolerance.

Bioflavonoids add complementary support without turning the product into a broad anti-inflammatory formula. The strongest use is foundational antioxidant protection rather than direct multi-pathway modulation.

Study evidence
Vitamin C Supportive 50 studies
Vision Support
Macular and Blue Light Defense
Vision Support
Impact
Moderate effect
D+ Goal FitB- Strength of SupportD CoverageC Formula Quality
Vitamin C · 500 mg

Buffered vitamin C with citrus bioflavonoids provides relevant antioxidant and modest capillary support. The buffered forms are clearly named and may improve tolerability for some users.

No macular carotenoids, zinc, vitamin E, or retinal omega-3 fats are present. The product is a well-constructed vitamin C formula but remains too narrow for broad vision support.

Study evidence
Vitamin C Disputed 24 studies

Ingredients

IngredientAmount per serving
Vitamin C (Calcium Ascorbate, Strontium Calcium Ascorbate)
 500 mg
Bioflavonoid Concentrate (Citrus)
 200 mg
Vitamin C Support Base
25 mg
Adults 18–50
Report overview
Vitamin C (Calcium Ascorbate, Strontium Calcium Ascorbate) · 500 mg OverallScore84
B+ Active Ingredient Quality & BioavailabilityB Dose, Safety & Label TransparencyA+ Value

Buffered calcium and strontium ascorbates provide a practical amount with good expected gastric comfort. The mineral forms are named, although elemental calcium and strontium amounts are not separated. The branded delivery and low serving cost make the formula appealing despite incomplete mineral detail.

View ingredientView products
Loading alternative details
89 Performance

C-500 Calcium Ascorbate-C

NOW
<p>The ingredient profile makes it a stronger quality-focused alternative for the same vitamin C goals. Buffered calcium ascorbate delivers a practical vitamin C amount with clear mineral disclosure and exceptional relative value. The small bioflavonoid addition is unlikely to contribute much but does not undermine the strong core formula.</p>
86 Performance

C

Swanson
<p>The ingredient profile makes it a stronger quality-focused alternative for the same vitamin C goals. Fully buffered calcium ascorbate provides a meaningful vitamin C serving with good stomach-comfort potential. The focused formula keeps the active nutrient clear and avoids decorative additions.</p>
87 Performance

Ester-C with Citrus Bioflavonoids

American Health
<p>The ingredient profile makes it a stronger quality-focused alternative for the same vitamin C goals. A buffered vitamin C form and a substantial citrus bioflavonoid amount create a simple, well-dosed antioxidant formula. Strong satisfaction signals and a long supply support value, though excipients and intake directions are not shown.</p>
89 Budget

Pure Buffered Calcium Ascorbate

NOW
<p>The lower serving cost makes it a more economical alternative while retaining the same vitamin C focus. the buffered mineral ascorbate form supplies a meaningful vitamin C amount with a digestive-comfort advantage over plain ascorbic acid. Clear active dosing and favorable serving value are strengths, though complete use directions and inactive ingredients are not supplied.</p>
87 Budget

100% Pure Vitamin C Powder

Swanson Premium Brand
<p>The lower serving cost makes it a more economical alternative while retaining the same vitamin C focus. The pure powder supplies a flexible, meaningful vitamin C serving with exceptional economy and no active padding. Plain ascorbic acid remains acidic, so sensitive users may prefer a buffered form.</p>
87 Budget

C 500 mg

Mason Natural
<p>The lower serving cost makes it a more economical alternative while retaining the same vitamin C focus. A simple moderate-dose tablet provides useful vitamin C at excellent relative value and with extensive aggregate feedback. Generic ascorbic acid and missing inactive-ingredient details are the main limitations.</p>
87 Value

Pure Buffered Magnesium Ascorbate

NOW
<p>The formula offers a more favorable balance of vitamin C quality and serving value than the original. Magnesium ascorbate provides a substantial fully buffered vitamin C serving with excellent relative value and clear mineral disclosure. Feedback volume is limited, and detailed use directions or non-active ingredients are not supplied.</p>
83 Value

C 500 mg

21st Century
<p>The formula offers a more favorable balance of vitamin C quality and serving value than the original. A large supply of straightforward vitamin C provides meaningful daily support with excellent value. Basic ascorbic acid and incomplete inactive-ingredient details keep the formula from feeling premium.</p>
84 Value

Ester-C 500 mg With Citrus Bioflavoinds

American Health
<p>The formula offers a more favorable balance of vitamin C quality and serving value than the original. Buffered Ester-C provides a substantial vitamin C serving with good stomach-comfort potential. Citrus bioflavonoids add compatible plant compounds without distracting from the core nutrient.</p>
Report alternatives

Sources

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

  1. 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
  2. Serum vitamin C and spinal pain: a nationwide study.
    Dionne CE; Laurin D; Desrosiers T; Abdous B; Le Sage N; Frenette J; Mondor M; Pelletier S · Pain · 2017
    Cross-sectional study4,742 participantsGeneral Health forVitamin C
  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.
    EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA) · EFSA journal. European Food Safety Authority · 2026
    Guideline / consensusImmunity forVitamin C
  4. Immunocompetence and oxidant defense during ascorbate depletion of healthy men.
    Jacob RA; Kelley DS; Pianalto FS; Swendseid ME; Henning SM; Zhang JZ; Ames BN; Fraga CG; Peters JH · The American journal of clinical nutrition · 1992
    Clinical trial8 participantsImmunity forVitamin C
  5. 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
  6. Association between hemoglobin A1c, Vitamin C, and microbiome in diabetic foot ulcers and intact skin: A cross-sectional study.
    Tong KPS; Green SJ; Ortiz J; Wu SC · Health science reports · 2024
    Cross-sectional study42 participantsSkin Health forVitamin C
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. 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
  20. 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
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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
  26. Nutritional modulation of cataract.
    Weikel KA; Garber C; Baburins A; Taylor A · Nutrition reviews · 2014
    Narrative reviewVision Support forVitamin C
  27. 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
  28. 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