Vitamin D is important for the body to function properly: it balances the immune system, helps to keep bones healthy and benefits muscle regeneration. Yet, 1 billion people worldwide are vitamin D deficient. This is the case in winter particularly, as UVB rays barely reach Earth’s surface. In fact, the body produces 80% of this type of vitamin through solar radiation (the remainder comes from the diet). Given this, and considering the physiological functions of vitamin D, the effect it might have on both health and physical performance when taken as a supplement has kindled interest.
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