PRP technically is considered as a possible support solution for initial condition of hair thinning. Hair loss is a different subject all together. Also, the jury is out as to the actual efficacy of the procedure on different grades of hair loss suffers as the solution has been seen to work from some and not for the others. Also, what is important to understand is that the process has been mostly in the segment of research for a long period of time and the general feeling has been mixed to the end results gained due to a long list of reasons. This article on PRP may help you get a sound information to your query.