I don't think herbs are the answer. In my trial and error approach after trying a lot of different things I have come to the conclusions that in my case my body was reacting to toxic blood caused by a poor performing colon,leaky gut,parasites, and candida. My answer is to alkalize,detox, and cleanse the body. There are many things that can cause the problem but since the colon and toxic blood are common I have concentrated my efforts there. I use Bentonite twice daily also use psyllium and oxy colon cleanse. In my case I expect a year or more to improve. Herbs are hit and miss and unless you know what you are doing they may even be dangerous. Bentonite is safe and effective.