If you're stranded out in the ocean it's actually better to drink your own urine rather than seawater.
First of all, urine is a sterile product, it is only when it get's in contact of the urea or something that the impurities come in or so they say. Google "is it safe to drink urine" for details or what not.
Urine isn't a sterile product. Urea is a part of it, you don't have urine without urea.
It's safe in an emergency situation because it contains water, which your body can filter and use. But to continuously do it can become harmful over time. This video made my stomach hurt D:
>_< omg...
If a doctor says something is killing me I would stop right away or at least tone it down a bit.
Cancer sucks we need robotic bodies to avoid this stuff...