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As a sports dietitian, I usually take a "food first" approach to meeting micronutrient needs, but vitamin D is one of the exceptions. Few foods naturally contain significant amounts of it, and our ability to make this nutrient from sunlight varies quite a bit. That's why I often recommend vitamin D supplements for athletes, especially heading into the colder months. So, how much vitamin D do you actually need? Why is it so important? When should you get your levels tested, an