Since close to 80% of Americans are Vitamin D deficient, I highly recommend taking the time to watch this video so you understand just how important Vitamin D is to your immune system, not just in regards to COVID but in regards to all respiratory viruses.
Vitamin D and COVID 19: The Evidence for Prevention and Treatment of Coronavirus (SARS CoV 2)
Vitamin D and COVID 19: The Evidence for Prevention and Treatment of Coronavirus (SARS CoV 2)