Comparison

Glucosamine 500 mg & Marine Chondroitin 400 mg and Glucosamine Sulphate 2KCl 500 mg & Marine Chondroitin 400 mg (20%)

Glucosamine 500 mg & Marine Chondroitin 400 mg (Simply Supplements) lists 3 distinct ingredients and Glucosamine Sulphate 2KCl 500 mg & Marine Chondroitin 400 mg (20%) (SimplySupplements) 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 1.00: the same ingredients, at the amounts in the table below.

Amount per serving (and % of the Daily Value)
IngredientGlucosamine 500 mg & Marine Chondroitin 400 mgGlucosamine Sulphate 2KCl 500 mg & Marine Chondroitin 400 mg (20%)
Chondroitin Sulfate400 mg400 mg
Glucosamine Sulfate0.5 g0.5 g
Chondroitin (unspecified)80 mg80 mg

Amounts are per serving as DSLD gives them: Glucosamine 500 mg & Marine Chondroitin 400 mg, 1 capsule; Glucosamine Sulphate 2KCl 500 mg & Marine Chondroitin 400 mg (20%), 1 capsule. Current labels entered March 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