Grapefruit Juice (GFJ)- I'd toyed with the concept of using grapefruit juice for some time but have read through combined experiences. Recently I go through that it doesn't inhibit CYP2D6 but rahter 3A4 which happens to be to blame for conversion of codeine into norcodeine. In theory by inhibiting 3A4 you permit more codeine for 2D6 to become morph… Read More