first of all, im going to say that i love the bike in your avatar. mv agustas are the shit, and id own one if i could fit on one- it would look like i was riding around on one of them little ass pocketbikes. thats why my big ass pimps a zx12. yeah you probably hit, and passed through, a vein on the way IN because you follow the same path out as you do coming in... unless you dont know what youre doing and move the needle around a lot but if you did that youd slice your internals up pretty good and youd be spurting blood like a fountain. always aspirate the syringe when youre done putting it all the way into your body- a few bubbles should go up inside the tube but no blood- if theres blood then you hit a vein or, rarely, an artery. but anyway, if you did inject a shitload of juice into a vein, it could possibly be a fatal mistake. i know this guy that was getting some kind of steroid injections into his NECK, because he had a spinal problem (forgot what kind of steroid but it was a steroid). the doctor slipped once and injected it into an artery, and he was partially paralyzed and retarded for two or three days, but recovered fully and seemed pretty normal afterwards. i think youd run more of a risk of injury or death if bubbles were injected into a vein along with juice. i agree with everyone else that posted before me on this thread, and im sure youll be fine.