What is Vitamin B-3 /Niacin /niacinamide powder? Vitamin B3 has multiple benefits in skin care formulations from lightening and evening out the skin tone to boosting collagen production and keeping the skin smooth and more elastic. It is a white, crystalline, odorless powder with a low content of niacin. Niacinamide is the water soluble form of niacin. Vitamin B3 belongs …