i got a bottle of this to add to my current 1-test/4ad stack for a little preworkout boost... now all i can say is if this is burn free id think the regular stuff would burn a whole right through your nose.. i used just 1 squit per nostral and it BURNS.. kinda feels like.. umm well maybe i shouldnt get into that.. anyway only thing good is it doesnt last more than 5 min and doesnt leave those awful drips in the back of your throat. So far from what ive noticed it makes you a little more focused for about 20 min then it sort of fades away.. Ive only done it twice so far so maybe i need to give it a few more workouts.. we will see..