http://www.ncbi.nlm.nih.gov/pubmed/17995595
Potent inhibition of human cytochrome P450 3A4, 2D6, and 2C9 isoenzymes by grapefruit juice and its furocoumarins.
Girennavar B, Jayaprakasha GK, Patil BS.
Source
Vegetable and Fruit Improvement Center, Dept. of Horticultural Sciences, Texas A &M...