Just aspirate then. Also a lot of studies I read included intravenous methods but of course these were done with lab rats in a controlled environment. They said iv had no effect on blood pressure, heart or blood itself. I really wouldn't worry about and if you are worried then pull back a bit. I'm telling you, I had such bad shoulder pain that wouldn't go away and hurt all the time. I couldn't even fall asleep on it. I started with 250 for a bit, then jumped to 500. All site injected. By the time the first vial was gone I was pain free. I'm sure it was just muscle but I couldn't rest long enough especially with work so that it would go away. And my obsession with the gym wouldn't allow me to stop going either. Bothered me for a whole month and then one week bpc it was gone. Keep it stocked now.