Ostarine is still being tested in clinical trials.
The first phase III trials failed miserably. The CEO of GTx, the maker of ostarine, was forced out and they laid off 60% of their company. They are now trying a new clinical trial- you are correct.
It’s basically a drug with no market other than a PED and even then it is forbidden in the WADA and USADA code. So that leaves bodybuilders and athletes who cheat- like the 3 Clemson football players who tested positive for ostarine in 2018.
It’s a Frankenstein molecule by the way - 3 flourine atoms attached to carbon as part of the structure. Mother Nature almost never incorporates flourine in biomolecules- only pharmaceutical companies

. Gee- I wonder what the long term effects will be. Flourinated organics reside nearly forever in bodyfat, like chlorinated versions.
And yes, I’m a chemist by profession. A real one- not a Palumbo version, lol