Vitamin D is an essential vitamin lacking in the modern diet. Research suggests that vitamin D acts as a hormone and its insufficiency can affect bone mineralization, immune function, energy metabolism from carbohydrates, and hormone balance. The regular exerciser/athlete requires adequate bone mineral density for fracture prevention, a strong immune response, sustained energy levels for performance, and balanced hormone levels for muscle growth. Scientific evidence supports taking 2,000 IU of vitamin D per day for the maintenance of healthy blood levels.

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