HIGH amount of energy epinefrin almost?

I want something to give me a high amount of energy for when i work out to push me over the edge... What would do it. and is there any product that can be the same as epinefrin ? lol i know thats a little to much to ask.. But i want that feeling of being invincible lmao im not a mean person so please be matrue. And no im not taking speed to you dope heads out there. :)