“There is a substantial prevalence of vitamin D deficiency (<25 nmol/L) worldwide, with estimates of 5% to 15% in high-income countries; rates of vitamin D insufficiency (<75 nmol/L) range from 50% to 75%.1 In addition to its direct effects on bone pathologies,2 increasing evidence links vitamin D deficiency to cancer, metabolic disorders, cardiovascular disease, and multiple sclerosis.”
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