Vitamin B3, also called niacin, is derived from two compounds - nicotinic acid and niacinamide. It can be manufactured by the body. Nicotinic acid (but not nicotinamide) given in drug dosage improves the blood cholesterol profile, and has been used to clear the body of organic poisons, such as certain insecticides. People report more mental alertness when this vitamin is in sufficient supply. Niacin is best taken with the B group vitamins and vitamin c.

Vitamin B3 is required for cell respiration, 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.

Liver, lean meat, poultry, fish, rabbit, nuts, peanut yeast, meats including liver, cereals, legumes, asparagus, seeds, milk, green leafy vegetables, and fish. Your daily cup of coffee also provides about 3 milligrams of niacin.