Trivial risk management strongly says everyone should be taking Vitamin D as a prophylactic.
The government could be handing out free 'D' to the entire population (and for that matter, magnesium chloride).
Instead, we are treated to feckless defeatism in being told that nothing can alter the trajectory of COVID over the next few months. That’s far worse than the feckless inaction in the previous administration—ceding to hopelessness on top of inaction. So tens of thousands more people will suffer and die, needlessly. Meanwhile, the medical leadership remains incompetent beyond belief. There is no leadership; a monkey could do less harm.
Moreover, Vitamin D deficiency was already thought to be a serious public health issue long before COVID.
by Sebastian Rushworth M.D, Sept 11 2020
A new article has just been published in the Journal of Steroid Biochemistry and Molecular Biology looking to see if an oral vitamin D supplement can be used to cure covid-19. Considering that vitamin D is cheap, widely available, and safe, it would be pretty miraculous if that turned out to be the case.
...The results of this study are promising. In fact, they are very promising, and they are in line with earlier evidence that people who are vitamin D deficient get protection from respiratory infections if they take a daily vitamin D supplement... However, this study reminds me a little too much of the first published trial of hydroxychloroquine as a treatment for covid-19. That trial also had significant flaws, and also showed significant benefit, but the results were not borne out by the bigger, higher quality trials that followed
...In spite of my reservations, I do think it is reasonable for everyone to take a daily vitamin D supplement based on the results of this study. Vitamin D is after all safe, cheap, and widely available, so the potential benefits far outweigh the potential harms.
You might also be interested in my article about whether vitamin D protects against depression or my interview with Sky News about covid-19.
WIND: classic risk management. The case for taking Vitamin D is overhwelmingly positive.