
Importance The efficacy of vitamin D3 supplementation in coronavirus disease 2019 (COVID-19) remains unclear. Objective To investigate the effect of a single high dose of vitamin D3 on hospital length of stay in patients with COVID-19. Design, Setting, and Participants This was a multicenter, double-blind, randomized, placebo-controlled trial conducted in 2 sites in Sao Paulo, Brazil. The study included 240 hospitalized patients with COVID-19 who were moderately to severely ill...
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