Two FDA approved medicine(not health product) work. Regain and Propercia.
Regain can grow tiny hair. Propercia can keep your hair on your head. Consult your doctor before use. Beware of side effect.
Many naked heads are not naked head indeed. They have baby hair. In this case, only Propercia is necessary.
If you want to make your hear line moving forward, forget it, it doesn't worth to take medicine.