Platelet-rich plasma is one option for pattern baldness, but the research behind it comes with a catch that surfaces only when you ask how the treatment is standardized. This article reads that research for a reader in Ann Arbor, Michigan who wants to know what the evidence supports before committing to a course.
What the research says about its promise
A review at pmc.ncbi.nlm.nih.gov frames the case this way: "Due to the limited number of effective therapies for AGA, platelet-rich plasma (PRP) has become an effective alternative treatment." The same review is available as a literature review with a proposed treatment protocol.
The gap behind that promise
The review also states: "Although there have been several studies previously reported, a standard practice for PRP preparation and administration as well as a method to evaluate results have not been established." Without a standard preparation or a shared way to measure results, two practices can offer the same treatment under the same name. Their schedules and their outcomes can still differ.
For the broader picture of options, Cleveland Clinic maintains a guide to hair loss treatments, from topical products to medications and surgery.
Follow-up and upkeep
The review in the first section proposes a treatment protocol, and Cleveland Clinic describes the procedure on its PRP therapy page. Because no standard has been established, the schedule you are quoted is the practice's own plan. Ask to see it written down, including any return visits.
What to ask before you commit
Ask how the practice prepares the plasma, how often it expects you back, and how it will judge whether the treatment is working.