I'd like to warn everyone about Vitamin D. Taking a daily megadosage of some cheap Amazon Vitamin D I eventually reached twice the upper reference range value in my blood. I couldn't sleep anymore and went crazy and irritable and had constant diarrhoea.

It's one of the very few micronutrients that can actually harm you in excess, besides vitamin B6, which is also known to cause permanent damage.

You probably do not need and should not supplement vitamin B6.

https://en.wikipedia.org/wiki/Vitamin_D_toxicity#Signs_and_s...

https://en.wikipedia.org/wiki/Megavitamin-B6_syndrome#Signs_...