PRP stands for PLATELET RICH PLASMA. Your own blood will be processed in centrifuge for rich platelets and injected back on the scalp. This will help to increase blood supply to existing roots and help to retain them from further hair fall to some extent. This is mostly helpful for the age group of 20 to 25 years where the roots are still alive and yet to fall. But once the roots are dead and a person gets bald, PRP cannot grow any new hair.