2. B Vitamins This group of vitamins, which includes B1 (thiamine), B2 (riboflavin), B3 (niacin), B6 (pyridoxine), B12 (cobalamin), and folic acid, is vital for energy metabolism, nervous system health, and the formation of red blood cells. B vitamins are found in various ingredients, including meats, eggs, and whole grains, making them easily accessible in a high-quality puppy food.