I gotta say that everyone needs to be careful with the whole grapefruit thing. I tried this with a cycle of phera-plex and it went wrong. Yes the grapefruit juice will let you absorb more of the compound but you will also get more of the bad side effects also. I got a lot of estrogen related sides: bad bloating, high blood pressure, blood lipids went all to hell. You get the picture? You get more of the good and bad out of your supplements with grapefruit juice. Be Careful!!!
Agreed- gotta be careful- take a look at this study.....
Contraception. 1996 Jan;53(1):41-7. Links
Can grapefruit juice influence ethinylestradiol bioavailability?Weber A, Jäger R, Börner A, Klinger G, Vollanth R, Matthey K, Balogh A.
Department of Clinical Pharmacology, Friedrich Schiller University of Jena, Germany.
The effects of grapefruit juice on the bioavailability of 17 alpha-ethinylestradiol (EE2) after a single oral administration of 50 micrograms EE2 have been investigated. The pharmacokinetics of EE2 were studied in an open, randomized, cross-over study in which 13 healthy volunteers were administered the drug with herbal tea or grapefruit juice (naringin, 887 mg/ml). In contrast to herbal tea, grapefruit juice increased the peak plasma concentration (Cmax) significantly to 137% (mean; range 64% to 214%, p = 0.0088) and increased the area under plasma concentration-time curve from 0 to 8 hours (AUC0-8) to 128% (mean; range 81% to 180%, p = 0.0186).
This study shows that grapefruit juice increases the bioavailable amount of EE2. A possible explanation may be that grapefruit juice inhibits the metabolic degradation of EE2. Whether the increased bioavailability of EE2 following grapefruit juice administration is of clinical importance should be investigated in long-term studies.
Moral of the story is:
if you are using something that aromatizes with grapefruit juice/naringin- the half-life of ALL circulating steroid hormones will be extended, not just testosterone 
