What is the function of vitamins in the body?

Vitamins play a critical role in the body by aiding in various metabolic processes and supporting the immune system. Each vitamin has specific functions, ranging from acting as coenzymes in biochemical reactions to facilitating the absorption of other nutrients. For example, vitamins like B-complex are essential in energy metabolism, helping the body convert food into energy, while vitamins A, C, D, and E are crucial for maintaining immune health, promoting skin health, and contributing to overall physiological functions.

The other options do not accurately reflect the primary functions of vitamins. While energy sources come from carbohydrates, fats, and proteins, vitamins themselves do not provide energy directly. They are not building blocks of proteins; that role is fulfilled by amino acids. Additionally, although some vitamins can be stored in the body, their primary purpose is not to serve as energy storage but rather as essential nutrients that facilitate biochemical processes necessary for sustaining life and health. This highlights the importance of obtaining an adequate amount of vitamins through a balanced diet.