Some time back a friend of mine gave me a vial of pure adrenaline. Both his parents are doctors. He told me to be careful- a little too much can easily kill you. I loaded up 10units in a 1ml syringe and plunged it into my vein. Fucking intense. I remember being knocked back onto my bed and bang, bang, bang with each heart beat. That is the most intense rush I've ever felt in my life. Last about 10 secs then felt a bit funny after that. Threw the rest away because of paranoia that if I used adrenaline too much then maybe I would fuck the adrenaline glands in my body and hinder my ability to naturally produce it- didn't want that to happen.