What role do vitamins play in the human body?

Vitamins play a crucial role in the body's functions, especially in facilitating growth and repair processes. They are essential nutrients that assist in various biochemical reactions, supporting the maintenance and development of cells, tissues, and organs. For instance, vitamins such as vitamin A contribute to vision and immune function, while vitamins C and D are important for skin health and bone formation, respectively.

While vitamins do not provide energy directly as macronutrients (carbohydrates, proteins, and fats) do, their supportive role in enzyme activity helps convert food into energy. Vitamins also do not store energy or primarily function to protect against germs; those roles fall to other substances in the body. Therefore, their primary contribution to the processes of growth and repair underscores why this choice accurately reflects the significant function of vitamins.