Don't know if this will help but while I had no hair I rubbed Jojohba oil and olive oil (from chemist) into my scalp every night. I used jojohba one night and olive the next night. Once my hair started growing it grew fast and is quite thick now. My hairdressers said she thinks it is thicker than before. I also once saw on a medical programme that taking prohibotic's from health shop can promote healthy hair growth.
Anyway good luck.