![]() However, vitamin D receptors are also present on a large variety of extraskeletal cell types, including cardiomyocytes, vascular endothelial cells, neurons, immune cells, and pancreatic β-cells. Vitamin D deficiency is well known for its musculoskeletal complications in children and adults ( 1, 3, 4). In Germany, for example, 57% of the 18–79-year-old residents are vitamin D deficient, and this is mainly explained by the lack of sufficient sunlight exposure and low dietary vitamin D (2). As a result, vitamin D deficiency, defined as a serum 25-hydroxyvitamin D 3 (25-OHD 3) level <50 nmol/l, is very common in Northern Europe. Vitamin D status is related to sunlight exposure and therefore depends on latitude (1).
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