Commonly known as Vitamin B3, It is a powerful multi-tasker- anti-aging, reduces hyperpigmentation and anti-inflammatory. It can boost collagen production as well as the production of these three important proteins keratin, filaggrin, and involucrin to improve skin structure and have reduced appearance of wrinkles. With regards to hyperpigmentation, it suppresses the transfer of pigment carriers (melanosomes) from pigment producing cells (melanocytes) to the surface of the skin (keratinocytes) while most other skin lighteners block an enzyme called tyrosinase.

Journal of Cosmetic Dermatology, Volume 13 (4) – Dec 1, 2014, A review of nicotinamide: treatment of skin diseases and potential side effects

Skin Pharmacol Physiol 2014;27:311-315, Niacinamide - Mechanisms of Action and Its Topical Use in Dermatology