JayMan said:
type I dht is found in the brain
propecia blocks a miniscule amount, like less than 1% I believe. It won't do any harm. propecia mainly blocks type II
avodart, at the prescribed dose, blocks half of type 1. we don't know the effects of this on the brain.
so propecia is absolutely safe for the brain. we are not as sure about avodart but there is no reason to assume that it's bad for it.
I recently said exactly the same thing about finasteride. but it's now in a discussion.
Check out the post "dutasteride and memory" in which doc077 is discussing propecias effects on the brain. Apparently the 5AR2 also converts progesterone, or something, and he has a pet theory (just speculation at the moment, if you're reading this Doctor don't worry im not freaking out) that it might explain some of the "cognitive" problems people are apparently having on finasteride.