make sure you aspirate the needle, or understand that you need to during injections, if you dont and you hit a vein, and inject in a vein then 400mg of test in rushing back into your heart, if you live(which you can die from injecting in a vein), it wont be a fun feeling... so, do your homework bout how to inject, were to inject and so on, i think there are some links for proper injections, dont be scared of that but just learn before you jump into stuff like this, this isnt jks! this isnt GNC, this inst flex magazine, do your homework man....