Grapefruit Juice (GFJ)- I had toyed with the thought of working with grapefruit juice for some time but have examine mixed reports. A short while ago I go through that it won't inhibit CYP2D6 but rahter 3A4 which is accountable for conversion of codeine into norcodeine. In concept by inhibiting 3A4 you permit far more codeine for 2D6 to become morp