Comparison
Quercetin-C and Vitamin C and Bio-Quercetin Phytosome
Quercetin-C (Cardiovascular Research) lists 4 distinct ingredients and Vitamin C and Bio-Quercetin Phytosome (Life Extension) 3 (rows of one ingredient counted once); 3 are on both labels. On the site's similarity measure, which compares ingredient lists (1 for the same list, rarer ingredients counting for more; amounts are not part of it), the two formulas score 0.71.
| Ingredient | Quercetin-C | Vitamin C and Bio-Quercetin Phytosome |
|---|---|---|
| Vitamin C | 100 mg (111%) | 1,000 mg (1111%) |
| Quercetin | 100 mg | 15 mg |
| Phosphatidylcholine | 0.25 mg | not disclosed |
| Rutin | 250 mg |
Amounts are per serving as DSLD gives them: Quercetin-C, 1 capsule; Vitamin C and Bio-Quercetin Phytosome, 1 vegetarian tablet. Current labels entered March 2024 and June 2025. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.
Each product on its own
- Quercetin-CCardiovascular Research: every row against all products listing it
- Vitamin C and Bio-Quercetin PhytosomeLife Extension: every row against all products listing it