The primary function of vitamins in the body is to support various biochemical processes necessary for maintaining health. These essential organic compounds regulate metabolism, aid in energy production, and strengthen the immune system. For example, vitamin C acts as an antioxidant, helping to protect cells from damage, while B vitamins facilitate energy conversion from food. Vitamins also play critical roles in processes like blood clotting and vision. A balanced intake of vitamins is vital to prevent deficiencies and support overall physiological function.