Does black powder really improve performance?

im in cross country and about a month or so ago we had a 7 mile timed run. my friend sold me some black powder and i took it before the run. i ended up running the best i had ever run for a timed run. i also didnt feel anything till the last mile. did the black powder really help me in the long run? or was it just temporary? is it legal to use before a race?or is it just pretty much a legal steroid? please answer all my questions if you canDoes black powder really improve performance?
You must know nothing, if you don't know anything about the product don't take it.

blushed