In this study, a group of 17 COVID-19 patients received a combination of vitamin D, magnesium, and vitamin B12. 26 COVID-19 patients served as a control group. The patients who received the micronutrients had a lower need for oxygen therapy and intensive care support than patients in the control group. Further details can be found in the study.
Y Sato, Y Honda, T Asoh, M Kikuyama, K Oizumi