Vitamin D supplementation had no effect on preventing Acute COVID illness.
https://sciencebasedmedicine.org/vit...qT8eyaC-Tafn5E
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There were multiple strengths to this study, including the baseline low levels of vitamin D, and the demonstrable effectiveness of the supplements. Compared to the study I blogged about a year ago, this was a more typical (daily) dose versus a single massive dose. There were few dropouts and a modest number of COVID-19 cases. The limited number of cases, particularly of hospitalizations, means we need to be cautious in making definitive conclusions. However, there was no suggestion of benefit.
In this randomized controlled trial, vitamin D had no effects on the incidence or consequences of COVID-19 or other acute respiratory infections. This was despite active treatment with vitamin D that did meaningfully raise serum vitamin D levels.
This is another prospective trial with vitamin D in COVID-19 to show no meaningful effect in the prevention of acute illness. Having said that, it’s clear that (at least in this population) vitamin D deficiency is widespread, and supplementation may be appropriate for individuals anyway. But there continues to be no persuasive evidence to suggest that vitamin D supplementation will help protect you from COVID-19 infections.
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