Comparison

Quercetin/Nettle Liquid and Quercetin + Nettles

Quercetin/Nettle Liquid (Highland Laboratories) lists 3 distinct ingredients and Quercetin + Nettles (Designs for Health) 2 (rows of one ingredient counted once); 2 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 0.82.

Amount per serving (and % of the Daily Value)
IngredientQuercetin/Nettle LiquidQuercetin + Nettles
Quercetin200 mg600 mg
Stinging Nettle30 mg600 mg
Vitamin C100 mg (111%)

Amounts are per serving as DSLD gives them: Quercetin/Nettle Liquid, 1 tsp; Quercetin + Nettles, 3 capsules. Current labels entered October 2017 and July 2013. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.

Each product on its own