I have spent hours researching this. I added Jack Norris' website as a link as he has great info on D3.
The point here is that I had no clue about Vitamin D.
And this of course leads to what other things I may not have a clue about!
Thanks for reading! And please keep me posted on things you are learning about in regards to a vegan diet. You can email me at firstname.lastname@example.org if you don't want to leave a public comment.