Niacinamide, also known as nicotinamide, is a form of vitamin B3. It plays an important role in the body in converting nutrients into energy and is also essential for the proper functioning of the nervous, digestive and immune systems. Niacinamide acid is a form of niacinamide that is commonly used in skincare and beauty products due to its ability to improve skin tone and texture, reduce inflammation, and increase collagen production. It has also been shown to reduce the appearance of fine lines, wrinkles, and hyperpigmentation.