Comparison

L-Arginine 500 mg and L-Arginine 1000 mg

L-Arginine 500 mg (Source Naturals) lists 2 distinct ingredients and L-Arginine 1000 mg (Natural Factors) 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 1.00: the same ingredients, at the amounts in the table below.

Amount per serving (and % of the Daily Value)
IngredientL-Arginine 500 mgL-Arginine 1000 mg
Calcium47 mg (4%)40 mg (3%)
Arginine1,000 mg1,000 mg

Amounts are per serving as DSLD gives them: L-Arginine 500 mg, 2 capsules; L-Arginine 1000 mg, 1 tablet. Current labels entered August 2023 and August 2017. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.

Each product on its own