Grapefruit Juice (GFJ)- I had toyed with the thought of using grapefruit juice for a very long time but have study combined stories. Recently I study that it won't inhibit CYP2D6 but rahter 3A4 which is answerable for conversion of codeine into norcodeine. In concept by inhibiting 3A4 you leave more codeine for 2D6 to grow to be morphine. After rea