Grapefruit Juice (GFJ)- I'd toyed with the thought of utilizing grapefruit juice for many years but have browse mixed experiences. Recently I go through that it doesn't inhibit CYP2D6 but rahter 3A4 and that is accountable for conversion of codeine into norcodeine. In theory by inhibiting 3A4 you leave more codeine for 2D6 to become morphine. Just