Grapefruit Juice (GFJ)- I'd toyed with the idea of employing grapefruit juice for some time but have study mixed studies. Just lately I read that it isn't going to inhibit CYP2D6 but rahter 3A4 which can be to blame for conversion of codeine into norcodeine. In concept by inhibiting 3A4 you permit a lot more codeine for 2D6 to turn into morphine. I