I've been using Jins bought from Ch*n who is recommended by Al*n & although they seem very legit & real, I don't get the same kick & oomph that I used to get off the Serostims. At 6iu, the Serostims gave me a huge pump, water gain, sleepiness & numbness. The Jins don't do that, even at 10iu. Maybe a little edema & numbness after long term use, but nothing like the Serostims. I also don't feel tired on the Jins, which I always got on the Serostims. Has anyone encountered this? Is it possible that these Jins are underdosed or counterfiet? I have no idea why 10ius would feel like 2ius.