When I first began taking it, I was concerned about buying fake GH so I began to ask around if there was a way to test it. Apperently,everyone around here even the competing bodybuilders, seems rather uneducated on the GH issue. i got alot of conflicting info on dosage, MUCH less the authenticity of GH. Their comments generally were "oh, these guys are connected, its real", Well, that did little to ease my mind, after reading how even pros have bought HCG packaged as GH. So after like 2 weeks of racking my brain I looked up what HCG really was.Ii mean I used it after coming off a cycle but once I dug into its real nature I realized that this is the substance that pregnant women produce. After thinking about it I researched what made a pregnantcy test work and found out that it is testing for the presence of HCG. So, I did a test. I bought 2 tests, put a drop of HCG on one and several drops of GH on the other and ran them under water. Sure enough, the HCG test was positive and the other negative. So, assumiing that 30% of GH is fake (thats just a guess), and conterfiet GH is HCG 90% of the time, that would mean a negative pregnecy test would conclude that one is 97% certian it is real. This could be slightly higher or lower depending on the real numbers but it would not vary much. And having some test is better than no test!