Vitamin D again
Dr JoAnn Manson, is a professor of medicine at Harvard Medical School and Brigham and Women's Hospital. She says this:
there was about an eightfold higher risk of having severe illness among those who entered with vitamin D deficiency compared with those who had sufficient vitamin D levels.
So. If I get Covid-19 and shrug it off like a bad cold, that's fine, but if I get severe illness, that could be very bad.
How much do you need?
The recommended dietary allowance of vitamin D is 600-800 IU/daily, but during this period, a multivitamin or supplement containing 1000-2000 IU/daily of vitamin D would be reasonable.
You can see her article here.
I bought vitamin D pills from a supermarket, and they cost me 8p each. Actually, I didn't buy them from a supermarket, I went to eBay first, then I thought, "How do I know they aren't fake?" because there are a lot of fake products on eBay. So I went to a big supermarket web site, saw what brand they sold, and bought that brand. I'm taking 2000 IU per day. The brand shouldn't matter, as long as you do get genuine vitamin D.
It's an awful thought that people are willing to sell fake products that could kill you by not doing what they are supposed to. I'm still trying to get a refund for the fake UV lights I bought. So far, they've offered me a 30% rebate, but I'm telling them that I'm not accepting that, because the lights are fake disinfectants.
Are the D supplements keeping me in good health? I don't know, but at a cost of 8p per day, and with good scientific evidence that D deficiency lowers immune response, and having had myself tested a few months ago and I came up D deficient, it seems like money well spent.