Nicotinamide (INN, BAN UK) or niacinamide (USAN US) (IUPAC name: 3-pyridinecarboxoamide) is a form of vitamin B3 found in food and used as a dietary supplement and medication. As a supplement, it is used orally (swallowed by mouth) to prevent and treat pellagra (niacin deficiency). While nicotinic acid (niacin) may be used for this purpose, nicotinamide has the benefit of not causing skin flushing. As a cream, it is used to treat acne, and has been observed in clinical studies to improve the appearance of aging skin by reducing hyperpigmentation and redness. It is a water-soluble vitamin.
Niacinamide is the amide form of niacin (vitamin B3) and serves as a precursor to the coenzymes NAD and NADP, which are essential for cellular energy metabolism and DNA repair. Unlike niacin, niacinamide does not cause vasodilation or flushing, making it ideal for topical application. It has been extensively studied for its multiple benefits in dermatology, including its ability to improve barrier function, reduce inflammation, and regulate sebaceous gland activity.
Biological Mechanism
Niacinamide works through several mechanisms: 1) Enhances ceramide synthesis, improving barrier function; 2) Reduces sebum production by decreasing sebaceous gland size; 3) Anti-inflammatory effects through inhibition of inflammatory mediators; 4) Antioxidant properties via NAD/NADP pathways; 5) Inhibits melanosome transfer, reducing hyperpigmentation; 6) Stimulates collagen synthesis and improves skin elasticity.