pa1ad said:
In the case of some of the 17alpha-alkylated steroids (i.e. oxandrolone) hydroxylations are major deactivation pathways and these reactions I believe are regulated by P450 enzymes. So grapefruit might potentiate these somewhat
In the case of other steroids (i.e. testosterone and prohormones) however hydroxylations are very minor pathways of deactivation
17aas -- oxandrolone, stanzalol, dianabol, anadrol -- the most commonly taken orals. Hence, why I said it would work with most anything.
Of course IM compounds are outside of the range of this discussion anyway.
The only oral tests I can think of off hand is Andriol (which is terribly ineffective anyway) or methyltest.
Also, while not testosterone, progesterone is listed as having possible greater absorption taken with grapefruit juice, why would testosterone be so different?
Just to clarify, you're saying that CYP3A4 and P450 enzymes have little to do with degradation of PHs in the system?
Even
if the P450 deactivation of oral test (which nobody takes) or PHs was "minor" as you put it, then by your own words, one would receive at the least a minor increase in efficacy. But maybe, the efficacy would be improved quite a bit... As I mentioned before, the exact nature by which grapefruit juice aids in absorption is not completely understood; it may help absorbtion in ways we don't understand yet. I think the minor investment would merit taking grapefruit juice/extract -- if nothing else, the pectin is great for you.
Anecdotally, I find myself getting better than average results when employing grapefruit juice; a lot of very intelligent guys over on the juice (no pun intended) board swear by it to. At the least it will improve efficacy incrementally, but it might do much better than that too.