Comparison

C-1000 with Esterfied C and C 1000 mg Buffered

C-1000 with Esterfied C (Windmill) lists 2 distinct ingredients and C 1000 mg Buffered (KAL) 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)
IngredientC-1000 with Esterfied CC 1000 mg Buffered
Vitamin C1,000 mg (1111%)1,000 mg (1111%)
Calcium170 mg (13%)150 mg (12%)

Amounts are per serving as DSLD gives them: C-1000 with Esterfied C, 1 tablet; C 1000 mg Buffered, 1 tablet. Current labels entered March 2012 and October 2016. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.

Each product on its own