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Vitamin D is made in the skin when exposed to summer sunshine (UVB) and is present in only a few foods.
Vitamin D is necessary for healthy bones and for muscle function.
Vitamin D can be measured with a blood test for 25-Hydroxyvitamin D. The institute of Medicine recommends this level should be higher than 20ng/mL. A vitamin D supplement may be required to raise 25-Hydroxyvitamin D to healthy levels.