B vitamins are a group of water-soluble vitamins that play vital roles in cell metabolism and energy production. They include B1 (Thiamine), B2 (Riboflavin), B3 (Niacin), B5 (Pantothenic Acid), B6 (Pyridoxine), B7 (Biotin), B9 (Folate), and B12 (Cobalamin). Each of these vitamins has distinct histological impacts on various tissues and organs.