1 Product identity

Ingredient risk

1 ingredient to use with caution

Quercetin-C

Name: Quercetin-C
Brand: Cardiovascular Research

BrandCardiovascular Research→Other Combinations Capsule 8 ingredients 1 caution DSLD #283460

Net contents: 90 Capsule(s)

Target: Adults and Children 4 years and above

DSLD entry: 2023-03-22

2 Ingredients (8)

IngredientGroupSafety

QuercitinQuercetinConditionally Safe

RutinRutin—

Vitamin CVitamin CGenerally Safe

Phosphatidylcholinephosphatidylcholine—

Microcrystalline CelluloseCellulose—

GelatinGelatin—

Magnesium StearateMagnesiumUse with Caution

Silicon DioxideSiliconGenerally Safe

Ingredient amounts require the full DSLD label. View full label at NIH DSLD →

⚠️ Use with caution — restricted in some markets

Magnesium — Severe deficiency (<0.50 mmol/L) causes secondary hypocalcemia and hypokalemia that will not correct until magnesium is repleted first [1].

3 Safety cross-reference

Quercetin — Conditionally Safe

⚠ Inhibits CYP3A4

⚠ Affects cyclosporine levels

Vitamin C — Generally Safe

⚠ GI distress at high doses

⚠ Kidney stones risk >1g/day

Choline — Limited Evidence

⚠ Fishy odor at high doses

Magnesium — Use with Caution

⚠ Diarrhea (especially oxide)

⚠ Accumulates in renal impairment

Silicon — Generally Safe

⚠ Very low toxicity

4 Label claims

• Nutrient

• All Other

• Structure/Function

5 Data source

DSLD ID283460

Full labelView at NIH DSLD →

SourceOffice of Dietary Supplements, NIH

Market statusOn market

Entry date2023-03-22

6 More from Cardiovascular Research

View Cardiovascular Research Safety Scorecard → 58 products

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7 Cite this page

Vancouver

Pkhakadze G. Quercetin-C — product analysis [Internet]. Tbilisi: Public Health Institute of Georgia; 2026 [cited 2026 Jul 28]. Available from: https://supplement.ge/products/quercetin-c-283460/

CC BY 4.0. Product data from NIH DSLD; safety analysis by SupplementIndex.

Analyzed by SupplementIndex

PHIG · Editor-in-Chief: Prof. Giorgi Pkhakadze, MD, MPH, PhD

Product data sourced from the NIH Dietary Supplement Label Database (DSLD). Safety cross-referencing by SupplementIndex. This analysis is for informational purposes only. For corrections: info@accreditation.ge.
Publisher: PHIG