Niacinamide (Vitamin B-3) is an essential member of the B-vitamin family that must be obtained from the diet. It is the precursor to Niacin, but does not cause the &ampldquo;flush&amprdquo; normally associated with Niacin intake. Niacinamide is a water-soluble vitamin.Niacinamide and Niacin are two different forms of vitamin B-3. Niacinamide does not cause a Niacin flush. Niacinamide (B-3) is an essential member of the B-vitamin family.