“In a retrospective study of individuals tested for COVID-19, vitamin D levels above those traditionally considered sufficient were associated with a lower risk of COVID-19.”
The principal source for D is the sun. Healthy people spend more time in the sun. Healthy people are less susceptible to the virus. Does Vitamin D provide protection or does being healthy?
Both are good. I take 500+ IU’s a day and have been totally healthy at 66!............except for that heart attack and quad by-pass last April.....................