I have been a vegan for 15 years. When I was dx'd with PN two years ago, I first thought the cause could have been B12 deficiency (I did not take any vitamins). Then, I thought alcohol could be the culprit but that was quickly ruled out. We have since landed on idiopathic aka "unknown". Just to be on the safe side, I now take vitamins and do not consume alcohol. I still do not consume animal products. Does it help the PN? That too is unknown.