I can always hear radio advertisements regarding Vitamin D3 supplementation in preventing diseases especially COVID patients. In fact, I have one patient before who had been prescribed by another doctor of Vitamin D3. I have come upon a good video in you tube wherein it discusses the merit of using vitamin D3 supplementation as a treatment for COVID and cites good, credible clinical trials and medical studies about it. (I will link the said youtube video below:)
So regarding Vitamin D supplementation: according to studies, vitamin D insufficiency MAY INCREASE THE RISK of COVID and Covid complications BUT vitamin D supplementation IS ONLY VALUABLE TO THOSE WHO ARE VITAMIN D DEFICIENT. Meaning Vitamin D supplementation for those who are Not Vitamin D Deficient may not be of great value.