Comparison

Quercetin and Quercetin 500 mg

Quercetin (Natrol) lists 7 distinct ingredients and Quercetin 500 mg (Natrol) 7 (rows of one ingredient counted once); 6 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.

Amount per serving (and % of the Daily Value)
IngredientQuercetinQuercetin 500 mg
Vitamin C1,000 mg (1111%)1,000 mg (1111%)
Flavonoid66 mg100 mg
Quercetin500 mg500 mg
Lemonnot disclosednot disclosed
Tangerinenot disclosednot disclosed
Limenot disclosednot disclosed
Orange (unspecified)not disclosed
Sweet Orangenot disclosed

Amounts are per serving as DSLD gives them: Quercetin, 2 capsules; Quercetin 500 mg, 2 capsules. Current labels entered May 2019 and December 2017. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.

Each product on its own