Comparison

L-Arginine Advanced 1,000 mg and L-Arginine 5000 mg Natural Orange Flavor

L-Arginine Advanced 1,000 mg (Dr. Mercola) lists 3 distinct ingredients and L-Arginine 5000 mg Natural Orange Flavor (GNC) 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 0.68.

Amount per serving (and % of the Daily Value)
IngredientL-Arginine Advanced 1,000 mgL-Arginine 5000 mg Natural Orange Flavor
Carbohydrate1 g3 g
Arginine1,000 mg5,000 mg
Fiber1 g

Amounts are per serving as DSLD gives them: L-Arginine Advanced 1,000 mg, 3 capsules; L-Arginine 5000 mg Natural Orange Flavor, 9 g. Current labels entered August 2020 and October 2011. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.

Each product on its own