Comparison

Calcium "600" from Oyster Shells with Vitamin D3 and Calcium "600" from Oyster Shell

Calcium "600" from Oyster Shells with Vitamin D3 (Solgar) lists 3 distinct ingredients and Calcium "600" from Oyster Shell (Solgar) 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)
IngredientCalcium "600" from Oyster Shells with Vitamin D3Calcium "600" from Oyster Shell
Calcium1,200 mg (92%)1,200 mg (92%)
Sodium15 mg15 mg
Vitamin D15 mcg (75%)15 mcg (75%)

Amounts are per serving as DSLD gives them: Calcium "600" from Oyster Shells with Vitamin D3, 2 tablets; Calcium "600" from Oyster Shell, 2 tablets. Current labels entered April 2015 and December 2016. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.

Each product on its own