Dr. Daniel McCartney:

In respect of the first question, vitamin D supplements are optimal. In respect of neurological disease, there is much evidence that suggests there is an advantage in optimising vitamin D status. We have data from geographic studies, laboratory studies and observational clinical studies where we look at people who have SARS-CoV-2 infection and evaluate their clinical course. Latterly, we also have information coming from intervention trials with vitamin D supplementation so there is much evidence there that suggests that at least in the context of immunological problems that could predispose somebody to worse infection, vitamin D confers an advantage. Is there is a down side? I will bring Professor Kenny in on this. There are certainly situations where one needs to be careful with vitamin D but for most people, this is extremely safe. I will bring Professor Kenny in to talk more about that.