Its either fake or your just not eating enough!!!
I took 250mg a week for 3 weeks, 500mg a week for three weeks and 250mg a week for 3 weeks put on 20 pounds first time. Just done same again and put on 14 pounds and was eating very clean this time.
Train heavy compound movements 4 times a week, eat enough protien and consume at least 1000 calories a day more than your maintanence level and if its real you wont be able not to grow!! Good luck..