Comparison

Flush-Free Niacin 500 mg and Flush-Free Niacin (Inositol Hexaniacinate) 500 mg

Flush-Free Niacin 500 mg (Nature Made) lists 2 distinct ingredients and Flush-Free Niacin (Inositol Hexaniacinate) 500 mg (Swanson Ultra) 1 (rows of one ingredient counted once); 1 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 0.77.

Amount per serving (and % of the Daily Value)
Ingredient	Flush-Free Niacin 500 mg	Flush-Free Niacin (Inositol Hexaniacinate) 500 mg
Inositol nicotinate	500 mg	500 mg
Fat (unspecified)	0.5 g

Amounts are per serving as DSLD gives them: Flush-Free Niacin 500 mg, 1 softgel; Flush-Free Niacin (Inositol Hexaniacinate) 500 mg, 1 capsule. Current labels entered January 2020 and September 2018. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.

Each product on its own

Flush-Free Niacin 500 mgNature Made: every row against all products listing it
Flush-Free Niacin (Inositol Hexaniacinate) 500 mgSwanson Ultra: every row against all products listing it