Update - Vitamin D Anger Issues
About a year ago, I posted here asking for suggestions about Vitamin D - I was having big time rage/anger every time I took more than a teeny amount. I had tried many different forms and brands, including D2 (which I had a bad reaction from because it was derived from yeast).
Recently, I learned that most Vitamin D3 supplements are made from lanolin (from sheep). A long time ago I had previously had BAD reaction to lanolin cream, so I put two and two together. Shortly after this realization, I found vegan Vitamin D + K2 (made from lichen) at Costco, and have had absolutely negative reaction to it!
I hope this helps others out there who might be having a poor reaction to the more common form of vitamin D.