Vitamins play essential roles in the human body, acting as vital nutrients that support various bodily functions. They are crucial for processes such as metabolism, immune function, and the maintenance of healthy skin, bones, and blood. Each vitamin has specific functions; for example, vitamin C is important for collagen production and immune defense, while vitamin D is essential for calcium absorption and bone health. As micronutrients, vitamins cannot be synthesized by the body in sufficient quantities, making dietary intake important. A balanced diet rich in fruits, vegetables, whole grains, and lean proteins helps ensure adequate vitamin levels for overall health and well-being.