Which of the following is true about vitamins?

Vitamins are indeed essential for numerous bodily functions, even when consumed in relatively small amounts. Each vitamin plays specific roles in maintaining health, such as supporting metabolic processes, aiding in the synthesis of hormones, and functioning as antioxidants. For example, Vitamin C is crucial for immune function and collagen production, while Vitamin D is important for calcium absorption and bone health. The body does not typically produce enough of these vitamins on its own, so they must be obtained through diet or supplements.

The other options do not accurately reflect the role of vitamins. They are not classified as macronutrients, which include carbohydrates, proteins, and fats that are needed in larger quantities. Additionally, vitamins do not primarily provide energy; they assist in the energy production process rather than serving as a direct energy source themselves. Therefore, the correct understanding of vitamins recognizes their vital contributions to health, confirming that they are essential even in small amounts.