u should go to a normal medical doctor, like ur family doctor
ask for recommendation to a dermatologist, normally NSC. I know my friend went to national skin centre b4.
He’s a guy, so the doctor recommend him eat propecia, a medication
for males suffering from mpb. Now he’s hair is so dark and thick,
but he seek treatment early that’s why. As for ur gf could be due
to many reasons, like hormones imbalance most of the time for
girls. so it’s best to go to a medical professional for help. All
those hair care centre is nonsense one, they are just trying to
earn ur money, and there’s no guarantee their products will
work.