PRP therapy may help improve hair thickness and density in selected patients, but the number of sessions varies according to the cause and severity of hair loss. An initial course commonly includes 3–4 sessions spaced about 4–6 weeks apart. Results can take several months to become noticeable, and some patients may need maintenance sessions. This guide explains the PRP treatment process, results timeline, factors affecting outcomes, safety considerations, and how a dermatologist can create a personalized treatment plan.