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How Much Vitamin D Do You Really Need?

Vitamin D plays an integral role in optimal health. It’s involved in the biology of all the cells and tissues in your body, including your immune cells. Vitamin D deficiency is associated with musculoskeletal pain, frequent or intense colds and flu, depression, impaired cognition, headaches, fatigue and more — and an estimated 40 percent of Americans are deficient. So what’s the “right” amount of vitamin D? How much do you need to keep your body healthy and avoid a...