Have had this for a while unopened, along with some of their other stuff. Purchased from their original site innovative-research (they became innovativepeptides, and now they are purity-solutions). I've heard that some of their stuff is bunk, but this has been treating me well. Taking .5mg EOD and I stopped it for a week and noticed a bit of water retention and other sides, so it's definitely working. I don't have any comment on purity-solutions branded stuff as this is before they switched.