"Muscle mass and strength: “Vitamin D deficiency causes muscle weakness.” “Performance speed and proximal muscle strength were markedly improved when 25-hydroxyvitamin D levels increase from 4 to 16 ng per milliliter (10 to 40 nmol [nanomole] per liter) and continued to improve as the levels increase to more than 40ng per milliliter (100 nmol per liter). Holick MF. Vitamin D deficiency. N Engl J Med. 2007;357(3):266-81."
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