It wouldn't cause the growth of facial hair or the growth of hair in
unwanted places. Biotin is necessary for PRODUCING healthy hair. It doesn't
affect the distribution of hair.

Personally, I don't think biotin will do you any good unless you are not
getting enough in your diet. If you are eating a normal diet, you shouldn't
have to supplement with biotin. But on the other hand, biotin may help
improve the health of your hair through its action on the metabolism of
scalp oils, so you might wanna try it out.

If you're going to go ahead with taking biotin supplements, don't drink any
alcohol, ingest uncooked eggs or take any anticonvulsant drugs within a
couple of hours of taking your biotin tablet because these greatly decrease
the absorption of biotin in your gut.

Hope this helps,

Sam