PRP (platelet-rich plasma) hair restoration uses a concentrated portion of your own blood, rich in platelets and growth factors, injected into the scalp to stimulate dormant hair follicles and improve hair density and thickness. It is most often used for early androgenetic (pattern) hair loss and typically requires a series of sessions.
How does PRP work for hair?
A small blood sample is drawn and spun in a centrifuge to concentrate the platelets, which release growth factors that support tissue repair and follicle health. This platelet-rich plasma is injected into the scalp, where it is thought to prolong the hair’s growth (anagen) phase, reactivate miniaturized follicles, and improve local blood supply. Because PRP is derived from your own blood, allergic reaction is very unlikely.
What does the evidence show?
Clinical studies and recent meta-analyses report that PRP can increase hair density and thickness in many patients with androgenetic alopecia — commonly cited results include roughly a 30–40% improvement in density over 3–6 months, with high patient-satisfaction rates. Evidence quality varies across studies because preparation protocols differ, so results are individual and not guaranteed. PRP is often combined with therapies such as minoxidil for better outcomes.
Who is a good candidate?
PRP tends to work best for people with early-to-moderate thinning and follicles that are still active, rather than areas that are completely bald. A physician evaluation determines candidacy and whether PRP alone or a combination approach is appropriate.
Treatment plan and timeline
A typical initial course is 3–4 sessions spaced about 4–6 weeks apart, followed by maintenance sessions (often every 6–12 months). Visible improvement usually develops gradually over several months. Downtime is minimal.
Risks and side effects
Because it uses your own blood, PRP has a favorable safety profile. Temporary effects include scalp tenderness, mild swelling, or pinpoint bruising at injection sites.
Frequently asked questions
Is PRP for hair loss permanent?
No treatment for pattern hair loss is permanent; PRP requires maintenance sessions to sustain results.
How many PRP sessions will I need?
Most protocols start with 3–4 sessions 4–6 weeks apart, then periodic maintenance.
Does PRP hurt?
Discomfort is usually mild; numbing can be used for comfort.
Physician-reviewed educational overview. At MD Laser & Cosmetics in San Mateo, PRP hair restoration is performed by Dr. Susan Lin, M.D., serving patients within a ~25-mile radius including Burlingame, Foster City, Belmont, San Carlos, Redwood City, Millbrae, Palo Alto and the greater Peninsula. This page is educational and not a substitute for a medical consultation.
References: NCBI / PubMed Central · American Academy of Dermatology. For guidance specific to you, consult a physician.