Credits to MedCram - Medical Lectures Explained CLEARLY channel:

Vitamin D and COVID 19: The Evidence for Prevention and Treatment of Coronavirus (SARS CoV 2) | 10/12/2020: https://www.youtube.com/watch?v=ha2mLz-Xdpg

Professor Roger Seheult, MD explains the important role Vitamin D may have in the prevention and treatment of COVID-19. Dr. Seheult illustrates how Vitamin D works, summarizes the best available data and clinical trials on vitamin D, and discusses vitamin D dosage recommendations.

Roger Seheult, MD is the co-founder and lead professor at https://www.medcram.com
He is an Associate Professor at the University of California, Riverside School of Medicine and Assistant Prof. at Loma Linda University School of Medicine
Dr. Seheult is Quadruple Board Certified: Internal Medicine, Pulmonary Disease, Critical Care, and Sleep Medicine.