Comparison

L-Carnitine 500 and L-Carnitine 1000 Tropical Punch

L-Carnitine 500 (MRM) lists 4 distinct ingredients and L-Carnitine 1000 Tropical Punch (GNC Pro Performance) 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 0.83.

Amount per serving (and % of the Daily Value)
IngredientL-Carnitine 500L-Carnitine 1000 Tropical Punch
Vitamin B65 mg (294%)2 mg (118%)
Pantothenic Acid (Vitamin B5)15 mg (300%)10 mg (200%)
L-Carnitine500 mg1,000 mg
Calcium70 mg (5%)

Amounts are per serving as DSLD gives them: L-Carnitine 500, 1 tablet; L-Carnitine 1000 Tropical Punch, 15 ml. Current labels entered July 2018 and January 2022. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.

Each product on its own