Since T levels vary a lot naturally, do you think you might be jumping to conclusions?
By what mechanism are you suggesting it reduces T anyway?
It's an androgen receptor blocker - if there were too much Spiro in your system, testosterone (and other androgens, for that matter), would be less effective.
Although there hasnt been much research done on topical Spiro for hair loss - most doctors who have prescribed it to their patients claim that it is generall well tolerated. If the FlyByU's drop in T levels is directly linked to the Spiro use, then perhaps he is overly sensetive to the drug.
However, consider this:
With a 2% spiro solution you are applying 20mg of the drug to your scalp (assuming you apply 1ml of solution 1x per day).
The molecular weight of Spironolactone base is ~417. so that *would* make it possible for it to be absorbed transdermally (<500). However - the skin on your scalp is thicker than any other location on your body, so this would make the bioavailability of any transdermal application there much less effective.
The smallest available dose of oral spiro is 25mg. I think its safe to assume the the oral avaialbility of the drug would be much higher than whatever transderamal abosroption rate is available when applying it in a solution of IPA and PG to the skin of the scalp.
This would make me think that if you *were* negatively affected by topical spiro use, it would be a case where your system is overly sensative to the drug - even assuming a transdermal absorption rate of ~15% you'd be getting ~3mg into your bloodstream.
FlyBU's post does raise some concerns though - Spironolactone is one of the most potent anti-androgens available. I wouldnt want even a few mg's of it floating around my system. If that's the case and you're really concerned about hair loss, I'd rather use finasteride, which only inhibits type-1 DHT receptors, before continual daily use of topical spiro, which binds to every androgen receptor it comes across.
Personally, Ive only really used Spiro while on a cycle of 1-test/4AD, and also throughout PCT. I didnt lose any hair and came out of PCT fine without losing any mass or strength, so I'm assuming that the Spiro did what it was supposed to, without systemic side effects.
After reading this new info - I would be really cautious about using it everyday - and if you choose to a blood test would probably be a good idea.
I'd be really interested to see the results of your next blood test, FlyByU. Thanks for the info and please keep this thread updated.
BV