No...and I'll tell you why. It's because untagged follistatin costs a fortune. I've use follistatin many times...and only once did it do what it is supposed to do...because it was untagged and dosed at 500 mcg/ml (rather than the standard 100 mcg/ml). If follistatin is good, it takes about 500 mcg/day to produce the kind of gains that one should expect. I once gained 17 lbs in 21 days using 500 mcg of untagged follistatin daily. Through lab analysis it was shown to be untagged and properly dosed. Furthermore, it had just been produced 1 week prior (follistatin doesn't stay good for a very long time).
Virtually every other brand of follistatin I tried was tagged and the dosage ranged from 100 mcg to 500 mcg. All of these provided pathetic gains, if any at all. Unfortunately, almost all follistatin is tagged...and there is a huge difference between tagged and untagged follistatin. The reason it's almost always tagged is because it makes it WAY easier and cheaper to produce. Making untagged follistatin requires the molecule to be synthesized from scratch, with each part of the 300+ molecular chain being individually strung together in a very labor intensive and costly process. Therefore, after a lab makes their first run they "tag" it, so they can use it as a "copy" or "blueprint" for future runs. This makes it way easier and loss costly to reproduce. The problem with this is that tagged follistatin doesn't work the same in the body. So, the only option is to spend a small fortune having it synthesized from scratch...or use tagged follistatin. In my opinion, neither option is viable.