Understanding Vitamin B3: An Overview Vitamin B3, commonly called niacin, is an indispensable nutrient vital for numerous bodily functions. It exists in three chemical forms: niacin (nicotinic acid), niacinamide (nicotinamide), and inositol hexanicotinate. Each form plays a unique role in supporting various physiological processes that are essential for maintaining overall health. Niacin is primarily known …