Comparison

D3 50 2000 IU (50 mg) and D3 50 mcg (2000 IU)

D3 50 2000 IU (50 mg) (Nature Made) lists 2 distinct ingredients and D3 50 mcg (2000 IU) (21st Century) 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)
IngredientD3 50 2000 IU (50 mg)D3 50 mcg (2000 IU)
Calcium90 mg (7%)90 mg (7%)
Vitamin D50 mcg (250%)50 mcg (250%)

Amounts are per serving as DSLD gives them: D3 50 2000 IU (50 mg), 1 tablet; D3 50 mcg (2000 IU), 1 tablet. Current labels entered June 2024 and December 2021. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.

Each product on its own