2. B Vitamins There are several B vitamins, including B1 (Thiamine), B2 (Riboflavin), B3 (Niacin), B6 (Pyridoxine), B12 (Cobalamin), and Folic Acid. These vitamins are vital for energy production, brain function, and the formation of red blood cells. They are commonly found in meats, grains, and vegetables.