If you mix it with Equipoise at a 2:1 Eq-T4 ratio, then it is actually quite painless, at least in my experiences. Some guys say the shit is "dirty", but it isnt. It's just chalk-full of Benzyl Alchohol, and they have yet to address that problem, unfortunately. Considering that most, if not all of Denkalls items are of high quality, this surprises me.