I have an interesting tid bit about this. My hair is thick, but on the very top my hair was slightly thinner but not thin, and I guess my pants had rubbed the hair on my knee caps off.
Well anyways I noticed that when I began doing the microcosmic orbit that after a few weeks of that that if felt new hair sprouting up on the thinner area of the top of my head, and my wife confirmed that it was not just my imagination.
Later when I began to do the macrocosmic orbit where I ran chi through my legs, that the hair on my knee caps sprouted back.
I'm not saying that it works that way for everyone or not, I have no idea, but it did work that way for me.