Niacin 100mg by Natural Factors 90 Tablet Features Vitamin B3 (Niacin) is necessary for protein metabolism energy production and normal nervous system function. This U.S.P. form of Niacin has a beneficial effect on the circulatory system causing some people to experience flushing a sensation of heat and reddening. With todays lifestyle it is often difficult to get proper nutrition making Natural Factors Niacin tablets your nutritional insurance to fortify your daily diet. Ingredients Each tablet contains Vitamin B3 (nicotinic acid).100 mg Dosage 1-5 tablets daily with meals or as directed by a health care practitioner. Keep out of the reach of children.