I have NO idea. I've battled hives as a child and now that I'm older, it's cropped up again. I'm seeing a Naturalpath and recently we've been trying to deal with a parasite in my system! I've been taking a supplement which needs to be taken on an empty stomach. It may be the supplemnt that affected me?? The only other thing I did was the night before each 2 tabsp of sunflower seeds & pumpkin seeds - but I do that regularly. I'm in a quandry!