Comparison

C 500 mg Chewable and Ester-C 250 mg

C 500 mg Chewable (Thompson) lists 5 distinct ingredients and Ester-C 250 mg (PhysioLogics) 6 (rows of one ingredient counted once); 5 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 0.87.

Amount per serving (and % of the Daily Value)
IngredientC 500 mg ChewableEster-C 250 mg
Carbohydrate1 g1 g
Vitamin C500 mg (556%)250 mg (278%)
Sodium25 mg20 mg
Sugar1 g1 g
Stevia3 mg1 mg
Calcium11 mg (under 1%)

Amounts are per serving as DSLD gives them: C 500 mg Chewable, 1 chewable; Ester-C 250 mg, 1 wafer. Current labels entered August 2014 and December 2011. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.

Each product on its own