Niacin: Nicotinic acid, one of the B-complex vitamins-B 3. Deficiency of niacin in the diet results in the disease pellagra. See: Pellagra. From Nutrition and Healthy Eating Resources NSCLC Nutrition & Appetite, ExplainedNutrition Tips for PBC Management Featured Centers What Are the Best PsA Treatments for You?Understanding Biologics 10 Things People With Depression Wish You Knew References Medically reviewed by Martin Zipser, MD; Board Certified: Surgery
