This is the only shampoo that has ever really worked on my psoriasis, and I have tried a LOT of them over the years. Not only does Sebex work great to prevent psoriasis flare ups on my scalp, it also helps get rid of existing build up. I highly recommend this product to anyone looking for a really good psoriasis shampoo that actually works like it says it will! The only downside is the smell, which isn't great, but that's unavoidable with a sulpher shampoo. Highly recommended!