I've googled the subject, but nothing really stood out: 

I've been vegan for about 8 or 9 years and I've noticed that the hair on the crown of my head is very thin. When I was a omnivourous teen I remember that my hair was on the thin side, but not quite like today. When I hold my bangs up it's a bit too easy to see my scalp. Needless to say, for a female, this is quite perplexing.

  Some observations:

I've noticed that my grandmother has thin hair too. They say that baldness skips a generation, so I wonder if it's that. I've always had greasy hair with flaky scalp, but I'm not sure if my hair has always been this fine.

  I've just read that Biotin can help. I already take a B-complex with 50 mcg of Biotin (Quest capsules). I'm tempted to try Vitamin E, but I read that too much will not help my problem.  

I suppose my present issue is that I'm lost, and I need a hint as to which direction I should look.