Maximum Nutrients' Niacin delivers twice the Niacin in each tablet (500mg as opposed to 250mg)! Maximum Nutrients' Niacin is the same great niacin without the heated, flushed response. Niacin is a water-soluble vitamin necessary for many aspects of health, growth, and reproduction. It is part of the vitamin B complex. Niacin (also known as vitamin B-3) is found in dairy products, poultry, fish, lean meats, nuts, and eggs. Legumes and enriched breads and cereals also supply some niacin. Niacin is required for cell respiration, it helps in the release of energy and metabolism of carbohydrates, fats, and proteins, proper circulation and healthy skin, functioning of the nervous system, and normal secretion of bile and stomach fluids. It is used in the synthesis of sex hormones, treating schizophrenia and other mental illnesses, and a memory-enhancer.