Treatment with 25-hydroxyvitamin D3 (calcifediol) is associated with a reduction in the blood neutrophil-to-lymphocyte ratio marker of disease severity in patients hospitalized with COVID-19: a pilot, multicenter, randomized, placebo-controlled double blind clinical trial
Maghbooli et al., Endocrine Practice, doi:10.1016/j.eprac.2021.09.016
https://c19early.org/maghbooli2.html