You beat me to it Alexa. Too much vitamin D can affect kidneys quite badly, but it is a rare side effect. Research other possible effects on the net. I take Vitamin D because of my age but take a low dose and not every day.
As for the much maligned Neanderthals, they were more intelligent than given credit for and I read somewhere that having the 2% guards against several other diseases in northern areas. I think the Northern Africans who came across the bridge and mixed with the Neanderthals have the gene too. I read too that the Asian strain Neanderthal gene is more prone to Covid. You win some, you lose some.
Which British song sums up the 1960s for you?


for passing on my lack of the vitamin. Maybe they had a fair share of the Neanderthal lurking there as well! My boys were prone to display what I can only describe as Neanderthal type tendencies when they hit their teens