This practice is well documented, although I have to admit I would find it very difficult to try it out. The fact is, however, that it is (in a healthy human) entirely sterile (no micro-organisms at all) and it apparently contains mostly SURPLUS compounds (i.e. various salts, etc. in excess of requirements for a correct balance for the body). I genuinely believe it would not do you any harm but am too much of a coward to put it to the test. If however I was ill with something and, all else having failed, I could see myself trying out a recommendation involving urine. By the way, it does not smell much at all until it has been out of the body for a while, by which time acquired micro-organisms from the environment are busy digesting it.