yeh man, i have studied it as well and it is very confusing.
It is so confusing to people because they do not specify when they are talking about an in vivo application as apposed to in vitro.
and there really isn't a great deal of in-depth information on it because companies like metamorphix are so damn discrete about it.
In vivo meaning the mouse was genetically tampered with in embrio form to produce an freakishly abnormal amount of follistatin. Follistatin does many things in the body, but the one were interested in , downregulateing myostatin (it binds to it and negates it so it cant attach to the receptor cells), well these mice constantly produce a high level of the myostatin negating follistatin.
There are other cases where in vivo, the mouse has the myostatin gene deleted but its the same result as having the myostatin gene and having a shitload of follistatin.
Now this case of course in vivo would be useless to us, but there are other cases in vitro where apparently like (igf-1, and other relatively new compounds) they have recently made a recombant follistatin. They inject follistatin into the mice and apparently it downregulates the myostatin. So when you would get off of it you should keep the gained muscle from the cycle but additional proliferation would stop occurring. So i guess you could just stay on it until you got as big as you wanted, or got injured by tearing something because so much muscle is built up. While your on the follistatin the myostatin from the myostatin gene is blocked, so new myo blast cells can proliferate and new muscle cells grow.
I have consequently found follistatin, and other things that i did not think were available on the internet and im sure if you do an in depth search you will as well.
What i don't know is, how much to inject, what your cycle would be, and all the real stuff you would need to know to actually use the stuff, but im sure as time goes along i will find people and people will come forward with that information......
but yeh sorry bro i know no real, useful information about how to use or how much to take but i simply know this product is now out there and in some peoples bodybuilding arsenals!