It's officially autumn and noticeably darker, with the dew falling with a sickening thud.
One of the key factors in mortality/morbidity with COVID19 is vitamin D deficiency.
Source:
There is considerable information on the NHS website as well as NIH (US).
I have started my 3000 iu megadose 2 weeks ago and I have a bit more energy and my moods are more stable - think I was vit D deficient most of August. At the latitude of the British Isles you only make Vitamin D from April to early September.
So take your Vitamin D.