The problem with this stuff, and Grapefruit Juice, is that it's not selective, they can increase the bloodlevels of a wide range of substances, somethings you want to up, and others not, but that's probably not a option.
I might want to up my M4OHN level, but not my Green tea to the point of being a prooxidant, or the stims I'm taking to the point of being too intensive.
I personally like to dose straight, and not throw a unpredictable multiplier in there across the board.