I am not sure but from what I heard this stuff is super potent in stims. But you are 16 and should not be taking this. But its your choice and if you want to try this go ahead and tell everybody your experience with it.
I don't know for sure. I have read somewhere that Ultra concentrate has the equivalent of 12-16 cups of coffee. Not sure if this is true. I do know this product doesn't give me bad jitters like other prew/k stims I have tried.