Mk is not expensive, might as well try it. Most who try it like it. It may not be exogenous HGH, but increases your endogenous HGH to a level equivalent to 2-3 IU's of exogenous HGH according to some blood work I have seen. Personally I have never used HGH, I cannot justify spending that kind of money on something that may be fake. I have used mk677 two times. I am on it now, I get better pumps and muscles look fuller, for the price I pay I will do it for life. I buy the raws and it is so cheap that way, can't go wrong