The most recent of these studies, published in The Journal of Steroid Biochemistry and Molecular Biology (Aug 29,2020) is more than convincing.

But this remarkable study is not likely to change the practices of modern medicine, even though it completely abolished COVID-19-related deaths in the intensive care unit (ICU) and reduced admission from a standard COVID-19 care ward to the ICU from 50% to 2%.

The study involved 76 hospitalized patients who were COVID-19-positive and had symptoms of coronavirus infection such as dry cough, shortness of breath, fever and diarrhea who were on a standard-care COVID-19 hospital ward.

Critics say the study is not large enough, co-morbid conditions such as obesity, diabetes and autoimmunity were grouped rather than identified specifically, and there were no vitamin D blood levels taken before and after treatment.  Yet there were no adverse reactions.  So, what harm could come from a hospital giving vitamin D to all patients on its COVID-19 ward?