Natural Factors Vitamin B3 Niacinamide - 500 mg - Natural Factors Vitamin B3 is a one-per-day formula that helps maintain the body’s ability to metabolize nutrients and helps in energy metabolism and tissue formation. Niacinamide is a gentle form of vitamin B3 that does not cause skin flushing or redness that is sometimes associated with higher doses of nicotinic acid. Our non-GMO formula provides 500 mg of vitamin B3 per vegetarian capsule as a factor in the maintenance of good health.