Niacinamide, a form of vitamin B3 also known as nicotinamide, is a precursor to two potent antioxidants that can help reverse signs of skin aging. The video sources, transcript, and doctor's notes are available at https://see.nf/3RlTUeT This is the third in a four-part series on so-called anti-aging skin products. See the first two videos, "What Is the Most Important Anti-Aging Cream Ingredient?" at https://see.nf/3EqQXla and "Topical Retinoids to Reverse Skin Aging" at https://see.nf/retinoids.