Niacin Tablets, USP Vitamin   NIACIN TABLETS 100 mg NPN 00268585 100 mg - Round, white, flat-faced, bevelled edges, compressed tablet, scored on one side and embossed "ICN N15" on the other (dia.3/8") Bottle of 500 NIACIN TABLETS 500 mg NPN 00294950 500 mg - Round, white, flat-faced, bevelled edges, compressed tablet, scored on one side and embossed "ICN N16" on the other (dia.7/16") Bottle of 500