This product has worked for, when other biotin brands have not. In my family, there'a genetic marker that means that biotin is not well absorbed. This product clearly has helped with that, reducing the intensity of my psoriatic arthritis and another family member's skin psoriasis, markedly. I can't say if it will help everyone with psoriasis or psoriatic arthritis, but I'd give it go, for sure. A bonus has been some obviously great hair growth. Take 2 pills (5mg) morning, two at night, or just 4 in the morning. These pills dissolve quickly and you'll want to wash them down without delay. But that's a minor point and should not make you miss out on the effectiveness of the product. Unbeatable.