In addition to what I say in that post, urine can also be used in a homeopathic sense, because it contains minute traces and antibodies (or whatever it is, I don't know the specifics of this) for whatever "ills" (virus & bacteria, or whatever) that your body is exposed to. When these minute traces are reintroduced in the body it stimulates a stronger defense response. I don't know a lot about homeopathy but that should be the basic idea behind it. Maybe someone more familiar with that aspect of it can give a bit more info (or I'm sure you can find it on the web, or in the various books on UT or Homeopathy)