A news article highlighted the practice and the Chinese government eventually banned it. In a country that doesn't exactly have top of the line safety standards for the stuff they make, even they draw the line at feeding people salty hair juice. So that's something, at least.
What is it Good For?
Your piss can save lives. It turns out there's a component of urine (Urokinase) that just happens to be extremely effective at breaking up blood clots, the kind that happen when someone suffers a stroke or a heart attack. Now before you decide to piss all over someone in cardiac arrest, we should mention that it takes a special filter to separate the anticoagulant goodies from the rest of the urine, though if you were going to piss on that person anyway we suppose we can't stop you.
So if doctors and stuff can use your piss, why aren't people going door to door with buckets buying it off you? And if they're not doing that, how do they collect the stuff? Well, it turns out somebody already has a whole bunch of piss on their hands...
Yes, we're talking about the Porta-John company. By treating their more than 10,000 rental toilets like giant specimen jars, they have gotten enough product to go into the production of what their website refers to as "human sourced proteins."
A filter is placed in each Porta-John, harvesting the desired proteins on a flow by flow basis while weeding out undesired clutter such as shit, used condoms and things that lay outside the dark boundaries of the human imagination. We're guessing the guy that gets sent to retrieve these filters didn't really "wow" anybody during the interview process.