I never experienced pain with testoprim-d, i got sore, but no pain. I warmed it up in the ampule under warm water, drew it in with my deca rediject and did a glute. no big deal. i felt great actually, mood wise like a day later, and for a solid week after i was on top of the world. rock hard erection which three other friends say they experienced as well. yeah it is milder than other stuff on the market, but for a newbie stack it ain't so bad.