Vitamin D............................

 ........................................read this post if you want to know more about it.  A snippet here:

The gold standard of medical research is the randomised controlled trial. Back in May, we had no such test for vitamin D and Covid-19. Now we do. The world’s first randomised control trial on vitamin D and Covid has just been published. The results are clear-cut. The trial, which took place in Spain at the Reina Sofía University Hospital, involved 76 patients suffering from Covid-19. Fifty of those patients were given vitamin D. The remaining 26 were not. Half of those not given Vitamin D became so sick that they needed to be put on intensive care. By comparison, only one person who was given Vitamin D requiring ICU admission.