I have had severe psoriasis for years. It would get even worse with stress. I had tried everything form hair med to other psoriasis shampoos, but nothing seemed to work. Some scalp treatments would work the first few times, then nothing. I saw this product and I figured why not try it, I was skeptical but I have to say this is the best psoriasis shampoo out there. Not only does it work, my scalp hasn’t felt this good in a long time.