Yeah, I was aware of that, that was for the treatment of prostate cancer too, not hair loss.
I have been using a .05% amount every day dissolved in ethanol and PG and it stopped my scalp itch and stopped me from waking up with morning wood for the first time in my life, which would suggest it's very much efficacious at that amount.
Only problem is it doesn't work for me, but nothing has, as my hair loss is not predominantly androgen related I suspect.
So I would reccommend you trying it at a dose like that if you're interested because I think it works at that strength and it is obviouly cheap as a result.
Have you tried PGE2?
That seems to be another potentially successful growing agent, albeit an expensive one.