Observational study examined 190,000+ patients from 50 states. Found higher levels of vitamin D were strongly associated with lower rates of testing positive for Covid, ”a relationship that persists across latitudes, races/ethnicities, both sexes & ages.” doi.org/10.1371/journa… 
For a helpful overview of more studies — both randomized and observational — I highly recommend @gshotwell’s collaboratively built collection of research summaries. I also recommend following him as he’s a careful evaluator of the evidence. vitamin-d-covid.shotwell.ca
Meta-analysis of 25 randomised controlled trials found “Vitamin D supplementation reduced the risk of acute respiratory tract infection among all participants” & ”Patients who were very vitamin D deficient experienced the most benefit.” bmj.com/content/356/bm… HT @julierehmeyer
Observational studies can’t prove causality. A small randomized trial in Spain found effects: ”Of 50 patients treated with calcifediol [a main metabolite of vitamin D], one required admission to ICU (2%), while of 26 untreated, 13 required admission (50%)” doi.org/10.1016/j.jsbm…
Small randomized trial in India targeted patients with mild Covid and vitamin D deficiency. Study found ”10 out of 16 (62.5%) participants in intervention group achieved SARS-CoV-2 negativity compared to 5 out of 24 (20.8%) in the control arm (p=0.018).” pmj.bmj.com/content/early/…
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