There are two forms of vitamin B3. One form is niacin, the other is niacinamide. Niacinamide is found in many foods including yeast, meat, fish, milk, eggs, green vegetables, beans, and cereal grains. Niacinamide is also found in many vitamin B complex supplements with other B vitamins. Niacinamide can also be formed in the body from dietary niacin.Do not confuse …