I've had bad gut/Psoriasis problems, and figured out, finally, that I probably have leaky gut syndrome. With eating right (no gluten or dairy & lots of veggies), this Quercetin, L-glutamine, N-acetyl cysteine, N-acetyl glucosamine, and probiotics/enzymes, after 1 month, my gut is super fantastic, my skin is clearing up. Note, I've only been taking this 1 month. Also I don't know for sure if this stuff is doing any good. I just know my gut feels great, I quit biting my nails, I'm sleeping better, and my skin is finally getting better