“Results from a clinical review published in The Journal of the American Osteopathic Association find nearly 1 billion people worldwide may have deficient or insufficient levels of vitamin D due to chronic disease and inadequate sun exposure related to sunscreen use.”
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Kim M. Pfotenhauer, Jay H. Shubrook. Vitamin D Deficiency, Its Role in Health and Disease, and Current Supplementation Recommendations. The Journal of the American Osteopathic Association, 2017; 117 (5): 301 DOI: 10.7556/jaoa.2017.055