It's really hard to believe, but urine is typically sterile. It doesn't seem like it could be true with the human body being as dirty as it is.
Urine has a multitude of purposes. It can contain antibodies that can be studied and used for diagnosis. Urine contains some chemicals that are useful in creating medicines. The urine from a pregnant woman can be extracted, purified, refined and used to treat infertility.
Pregnant horse urine is a main source for extracting estrogen which has a wide range of uses.
Urine has uses in the farming field too. Large amounts of nitrogen, potassium and phosphates are dissolved in the urine. Pure urine is far too rich to directly benefit plants. Pure urine will burn the roots of plants. Urine needs to be diluted to be used as a fertilizer to get those nutrients into the soil.
The part no one wants to even think about is the ammonia in urine which made it a natural cleaning agent through the ages. Not only that, it's what ancient Romans used to keep their teeth white.