The vein you are trying to miss is the cephalic vein, it is the one you can see running along the top of your biceps. The brachial artery is lying in the grrove between the biceps, you should have no problem with that. I have hit bis many times, one suggestion that worked for me is after I shot my bis I would work them out the same day because they became so tight the next couple days that I would not be able to do my arm workoutSpikeyLizard said:The vein you're trying to miss would be the brachial artery, but if you inject in the belly of the bicep muscle, you should be ok in that aspect.