Oh....I wanted to add my 10 cents worth on the Vitamin D3 subject. The last two years I've had some bad health issues starting with rather bad pneumonia in October 2018. This happened a short while after having a pneumonia vaccine shot. I just did not feel well after a few months and my health took a further nose-dive. I eventually ended up in hospital and saw an ENT, neurologist and a urologist. I had plenty of blood tests, scans etc. and eventually found nothing major to pinpoint my symptoms of overall weakness, wobbly legs poor speech (a disaster for me!) and shakes in my right hand. The neurologist then did a sleep study on me and stated that I have moderate sleep apnea. The graph showed that I had one apnea event for 60 seconds, plus many shorter events. Now, I never wake up gasping for air and don't snore, as evidenced by my wife. Anyway, I hated the idea of wearing a face or even a nasal mask, so while I was waiting for delivery of my CPAP machine, I did as much research as I could on sleep apnea.
I eventually found a lecture by a neurologist Dr Stasha Gominak in Texas where she mentioned the importance of right sleep and also Vitamin D3, so I studied her website and downloaded many of the reference papers to study. My D3 level in the blood test was 31 ng/ml and her recommended amount is 60-80 ng/ml, so I started taking supplements as she recommended. I improved somewhat and started to sleep a lot better. I have not checked my D3 level since this Covid-19 lock-down but it will be interesting to see how it looks now. My last test in November last year was 47 ng/ml. At the same time I found an amazing website on sleep apnea called the Apneaboard forum
http://www.apneaboard.com/forums/ There was a vast amount of info and help there and they offer a free software package that will monitor virtually all CPAP machines and allow the user access to all of the info that the clinicians only get. After a few weeks I recorded virtually zero apnea events, even with the pressure turned down as low as possible. I now sleep better without the machine, and would like to think that this is due to my D3 intake but of course it is possible that other factors also come into play.
You can all obviously draw your own conclusions, but it makes for an interesting study, and will give you some more insight as to why many scientists are stating that the correct balance of D3 in your system helps the overall immune system. Her website is
www.drgominak.com and a good starting point is to click on "LEARN" at the top of the screen and then Vitamin D or any of the other subjects. Her video's on YouTube are worth a good look as well. Hope this helps!
Keith R