Which vitamin is crucial for metabolism, vision, and skin health?

Vitamin B2, also known as riboflavin, plays a crucial role in various bodily functions, particularly in metabolism. It is essential for the conversion of carbohydrates, fats, and proteins into energy, which is vital for maintaining overall health. In addition to its metabolic functions, riboflavin is important for maintaining healthy skin and vision. It helps to keep the skin looking vibrant and supports proper functioning of the eyes, which includes contributing to the maintenance of good vision.

While other vitamins listed have important functions, riboflavin specifically ties into the areas of metabolism, vision, and skin health most directly. Vitamin C is primarily known for its role in immune function and skin health through collagen formation. Vitamin D is key for bone health and calcium absorption, and Vitamin E is primarily an antioxidant that protects cells from damage. Thus, riboflavin is the most relevant vitamin for the specified needs in the question.