Vitamin D2 vs. Vitamin D3

This is just a quick update to my previous post about Dr. Andrew Weil's article on becoming vegan, where he recomends taking Vitamin D3, which is almost always derived from animals (which, of course, means it's generally not vegan). In his article, he didn't mention Vitamin D2, which is usually derived from non-animal ingredients and is the form that tends to be used in vegan vitamins.

According to this recent study, although it was once thought that Vitamin D2 was less effective than D3, both forms are equally effective. So, there's no need for an animal-derived supplement.