Emerging and still open issues were related to target vitamin D levels and the role of vitamin D supplementation in COVID-19 since low vitamin D may predispose to SARS-CoV-2 infection and to worse COVID-19 outcomes. Specifically, in comparison to healthy populations, higher levels of vitamin D and greater amounts of vitamin D were deemed necessary in osteoporosis, diabetes mellitus, obesity (particularly after bariatric surgery), and in those treated with glucocorticoids. A tailored approach, based on the specific mechanisms underlying vitamin D deficiency in different diseases that were discussed, was recommended. Since vitamin D has a crucial role in skeletal and extra-skeletal systems, the aim of the Conference was to discuss improved management of vitamin D dosing, therapeutic levels and form or route of administration in the general population and in different clinical conditions. 4 th International Conference on Controversies in Vitamin D was held as a virtual meeting in September, 2020, gathering together leading international scientific and medical experts in vitamin D. 10 Institute of Endocrine and Metabolic Sciences, San Raffaele, Vita-Salute University and IRCCS Hospital, Milano, Italy.9 Service of Bone Diseases, Geneva University Hospitals and Faculty of Medicine, Geneva, Switzerland.8 Unit of Endocrinology and Diabetes, Campus Bio-Medico University of Rome, Rome, Italy.7 Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy.6 Division of Endocrinology, Escola Paulista de Medicina - Universidade Federal de Sao Paulo (EPM-UNIFESP), Sao Paulo, Brazil.
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