For what it's worth, this aint exactly creatine that he got popped for. You cant just get this stuff anywhere, (GNC, Bodybuilding.com,etc.) kinda why I find it hard to believe it was an over-the-counter exchange.
It contains something called Selective Androgen Receptor Modulator (SARMs). Wiki says:
They are intended to have the same kind of effects as androgenic drugs like anabolic steroids but be much more selective in their action, allowing them to be used for many more clinical indications than the relatively limited legitimate uses that anabolic steroids are currently approved for.
Reviews say it helps treat "muscle wasting" experienced by people suffering from MD. I've seen it described as an effective alternative to T-Boosters. Apparently, Grier gained 43 pounds in a year.