Summary Two compounds are known as the vitamin niacin: nicotinic acid (NiA) and nicotinamide (Nam). The physiological functions and metabolic fates of NiA and Nam are identical, but differ when pharmacological doses are administered. Our study aimed to investigate the metabolic interactions between NiA and Nam when their pharmacological doses were administered together. We measured seven major niacin catabolites, including NiA, Nam, N 1 -methylnicotinamide (MNA), N
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