If hair is thinning:
1) Consume Finasteride (Propecia) that you can get from any local pharmacies. You need to consume throught out your life as maintenance from hair loss.
2) Get Blood Plasma-Platlet Treatment at Hair Clinic (the best treatment revolutionary for thinning hair) be warn could be costly if you go to wrong clinic.
3) Use special shampoo (anti-DHT)
If hair totally lose out and no more follicles:
1) Hair Transplant is the only answer and the cost of it is more than all-three method above combined! but success rate 95% and the hair will never fall out even if you70 years old! and you wanna get the FUE technic and not FUT alright!

ps: Forget all Yun Nam type of products and treatment. They often ineffective because they dont help to regrow your hair but only retain existing ones.

Source: Multiple Doctors consultation experience.