Urine is sterile. Just like alcohol, or Purell hand sanitizer. These things will have some effect on some people with specific types of Psoriasis just as Dovonex or Coal Tar does. It still does not touch the cause of the condition which is poor elimination or the toxicity of the body through leakage in the juncture below the stomach. The ingesting of a waste product that the body produces has no logical consequence to the better functioning of the digestive systems involved in Psoriasis.