From what I understand, YK-11 has more to it than just blocking myostatin and should be taken from the start of a cycle. Some of the reviews say it's the strongest SARMS out there. Doses are 10 to 15 mgs a day.
One of the ways to confirm it's real is by taste. It's suppose to be horrible.
Anabolic Raws has this stuff. They sponsor us here.