Granny, links 1 and 5 are pretty much the same study and abstract and link 1 has the link in it for link 5. That makes no sense till you open the links!

Chicken, I have seen weird or unexpected results from body hair because body hair can go through a long latent period.

You can use anything on your head hair on body hair too but why don't you give us some more information such as history and hair color and texture etc.