I've taken small doses of P in the past, and the time I was on it I felt scalp activity, which I conclude is hair growth. Recently, I took it for 3 weeks, to finish off the left over I had, twice a week 100mg (small dose) and felt that scalp activity again. Maybe this will be the thing for me.
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I know this fellow was using P, in addition to other things, but had good success with the frontal area.
As for Bica, it seems to be a good alternative to CPA, which I don't like because it disturbs my sleep at night. I have heard when you get older and T levels drops you don't sleep as well. I also heard when guys get on TRT they sleep better again. So maybe it has nothing to do with aggression but T levels affect your internal clock.