Dear Krangstein, we're still trying to understand what prp can do!
I can only say that Dr Greco told me that prp is a sperimental treatment to understand the role of growth factors in the hair cycle.
This treatment is safe and so patients can try it even if results are still not clear and there is not just one protocol.
For example here in Italy there is a phisician called Dr Schiavone ( in Rome) who uses the Dr Greco protocol, and the treatment is 1 time a year.
Another phisician , Dr Rinaldi( in Milan), uses another protocol and he does 2 treatments (one at the beginning and the second after 3 months) in the first year.
I also know other phisicians who suggest to do 3 treatments in the first 6 months.
The prp acts on platelets' release of growth factors so the action is different from finasteride.
One acts on the hair cycle and the other on dht hormon.