The details below are solely the responsibility of the manufacturer. Niacinamide (Vitamin B-3) is a form of Niacin, a water soluble B-Vitamin. Niacinamide is readily converted into the bioactive forms of Niacin, NAD+, NADH, NADP, and NADPH, which are vital cofactors in cellular energy production and are critical for the maintenance of DNA stability.