When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Urine is generally considered to be at least fairly sterile. When it leaves the body, however, the urine can pick up bacteria from the surrounding skin, which would contaminate it. However, it is not generally advisable to use urine to clean open wounds. Urine production and excretion is the body's primary method for removal of urea, a protein metabolic byproduct. Aquatic organisms such as fish, alternatively excrete ammonia. Birds and reptiles excrete uric acid, as a protein metabolic byproduct, instead of urea or ammonia. There are some exceptions to these excretion patterns.