Vitamins are essential for a healthy life. Compared to other nutrients, the body needs them in very small amounts. B vitamins, often known as vitamin complex, class of water-soluble vitamins with key functions cellular metabolism. Thiamine (vitamin B1), riboflavin B2), niacin B3), pantothenic acid B5), pyridoxine B6), biotin B7), folate B9), folic acid, and cobalamin B12) eight distinct that co...