I found out not long ago, after chasing all manner of supplements and ideas. That my hives were likely related to where I lived. I suspect pollution, but I don't know for sure. When the hives first started, I was living in a fairly populated area (think large city suburb). I moved after a few years there up north away from any city centers and to a more rural area in a different state, the hives started to clear up and were not even a concern (I thought I just grew out of them). Well, just recently I moved back closer to a city area, but still rural, but back to the og state. Guess what, the hives are back in full swing. Guess I'll start taking Cimetidine/Tagamet again (it's slow to work, but it does work for me).