Platelet-rich plasma (PRP) injections have become one of the most talked-about in-office treatments for hair loss. The premise is straightforward: a clinician draws your blood, concentrates the platelets, and injects the growth-factor-rich plasma into thinning areas of your scalp. But the question most people skip is not “does PRP work?” — it is “how do I know if it is workingfor me?” That answer comes down to tracking.
TL;DR
- PRP uses your own concentrated platelets to stimulate hair follicles.
- A 2025 meta-analysis of 43 RCTs found moderate evidence for improved density.
- Most protocols involve 3–4 sessions over 3–6 months, then maintenance.
- Without consistent baseline photos and zone scoring, you cannot objectively measure response.
- Track density, shedding rate, and scalp condition before, during, and after sessions.
Important
This article is educational and not medical advice. If you are worried about sudden shedding, scalp symptoms, or side effects, talk to a licensed clinician.
How does PRP work for hair loss?
PRP works by delivering a concentrated dose of growth factors directly to hair follicles. A clinician draws a small amount of your blood (typically 10–60 mL), spins it in a centrifuge to separate the platelet-rich layer, and injects it into the scalp at thinning zones. The platelets release growth factors — including PDGF, VEGF, and TGF-beta — that are thought to prolong the anagen (growth) phase, increase blood supply to follicles, and stimulate dormant follicle stem cells.
The procedure typically takes 30–60 minutes and involves minimal downtime. Because it uses your own blood, the risk of allergic reaction is essentially zero. Common side effects are limited to temporary injection-site pain, mild swelling, and occasional bruising — all of which usually resolve within a day or two.
What does the clinical evidence say about PRP for hair loss?
The evidence is moderate and growing. A 2025 systematic review and meta-analysis published in Dermatology and Therapy analyzed 43 randomized controlled trials with 1,877 participants. It found that activated PRP significantly increased hair density and reduced hair loss compared to placebo. Patient satisfaction scores were also meaningfully higher in PRP groups.
Earlier meta-analyses reported a mean increase of approximately 25.6 hairs/cm² in density after three monthly sessions (95% CI: 4.45–46.77; P = .02). A 2024 meta-analysis focused on female hair loss found similar benefits across 21 studies and 628 participants.
The important caveat: there is high heterogeneity across studies. Preparation methods, platelet concentrations, injection depths, and session frequency all vary. This is exactly why individual tracking matters — population-level averages will not tell you whether your protocol is working.
What should you track before your first PRP session?
You should establish a comprehensive baseline before any treatment begins. This is the single most valuable step, and it is the one most people skip. Without a clean baseline, every “before and after” comparison is contaminated by lighting differences, angle shifts, and memory bias.
- Photo baseline: Take guided photos of your hairline, temples, crown, and part line using consistent lighting and angles. Lock these conditions so every future photo is directly comparable.
- Zone scoring: Score each zone on a 0–10 scale for density and thickness. An AI tracker like Balding AI removes subjectivity from this step.
- Shedding count: Log your approximate daily shed count for one week before treatment. This gives you a reference point to measure whether shedding decreases post-PRP.
- Scalp condition: Note any inflammation, flaking, or redness. PRP response can be affected by underlying scalp conditions, and your clinician needs this information.
- Current treatments: Record every product and medication you are currently using. If you are on finasteride or minoxidil, PRP is typically added alongside them, not as a replacement.
What does a typical PRP session protocol look like?
A typical protocol involves 3–4 initial sessions spaced 4–6 weeks apart, followed by maintenance sessions every 6–12 months. However, protocols vary between clinics, and your dermatologist or trichologist may adjust based on your severity, response, and budget.
Sessions 1–3
Monthly injections to build growth factor concentration in the scalp. Track photos and shedding counts after each session.
Months 3–6
The window where measurable density changes typically appear. Compare zone scores to your baseline at 12-week and 24-week marks.
Maintenance
Booster sessions every 6–12 months. Continue tracking to catch any regression early and adjust frequency with your clinician.
How do you tell if PRP is actually working?
You tell if PRP is working by comparing objective measurements across consistent time windows — not by staring in the mirror after a single session. Here are the signals to watch for:
- Shedding reduction (weeks 4–8): Many responders notice fewer hairs on the pillow and in the shower drain within the first two months. Log daily counts to confirm this is a real trend.
- Density score improvement (months 3–6): Compare your AI density scores at the 12-week mark to your baseline. A sustained upward trend of 0.5 points or more across two or more zones is a meaningful signal.
- Vellus hair conversion (months 4–8): Look for fine, light vellus hairs thickening into terminal hairs in your photos. This is easier to spot with consistent macro photography of the part line.
- Stabilization: Even if density does not dramatically increase, halting further loss is a positive outcome. Compare your 6-month trend to your pre-treatment trajectory.
How much does PRP for hair loss cost?
PRP sessions typically cost between $500 and $1,500 each, depending on your location, clinic, and the preparation method used. A full initial course of 3–4 sessions runs roughly $1,500 to $4,500. Maintenance boosters add $500–$1,000 every 6–12 months. PRP is generally not covered by insurance because it is considered elective.
Given the investment, tracking becomes even more important. If you spend $3,000 on an initial course and have no objective data showing whether it helped, you are making your next decision (continue, stop, or switch) based on guesswork. Consistent photos and scoring give you the evidence to have an informed conversation with your clinician about whether maintenance sessions are worth continuing.
Can PRP be combined with other hair loss treatments?
Yes, and it often is. PRP is frequently used alongside finasteride, minoxidil, or microneedling. A 2024 meta-analysis found that PRP combined with minoxidil significantly improved hair growth compared to either treatment alone. If you are stacking treatments, the tracking principle stays the same: introduce one variable at a time and give each addition at least 12 weeks before evaluating.
If you are already on finasteride or minoxidil and considering adding PRP, take fresh baseline photos and scores on the day of your first PRP session. This isolates the PRP contribution from the gains (or plateau) of your existing regimen.
What should you expect during a PRP session?
A PRP session takes 45 to 90 minutes from blood draw to final injection. The process starts with a standard venous blood draw (10–60 mL depending on the protocol). The blood is then placed in a centrifuge for 5–15 minutes to separate the platelet-rich layer from red blood cells and plasma.
Your clinician will apply a topical numbing cream or local anesthetic to the scalp before injecting the concentrated PRP at multiple points across the treatment area. Most patients describe the injections as a series of small pinches. Expect mild redness and swelling for 24–48 hours afterward. You can typically wash your hair the next day and return to normal activity immediately.
From a tracking perspective, take your weekly photos on a consistent day relative to each session — for example, always 5–7 days post-injection. This avoids capturing temporary swelling or redness that could distort zone scores. Log the session date, any pain or side effects, and whether the clinician adjusted the injection pattern or volume.
Who is a good candidate for PRP, and who should skip it?
PRP tends to work best for people with early-to-moderate androgenetic alopecia — those who still have active follicles that can be stimulated. According to the American Academy of Dermatology, PRP is generally not recommended for people with blood disorders, active infections, chronic liver disease, or those on anticoagulant therapy. Your dermatologist will screen for these before proceeding.
People with advanced hair loss where follicles are fully miniaturized or scarred may see limited benefit. This is another reason baseline tracking matters: if your starting point is very low density with no vellus hairs, you and your clinician can set realistic expectations before committing to a full course.
What is the bottom line on PRP and tracking?
PRP is a promising, low-risk procedure with moderate clinical evidence supporting its effectiveness for hair density improvement. But “moderate evidence” at the population level means individual results vary widely. The only way to know if it is working for you is to measure consistently: same zones, same lighting, same scoring method, at regular intervals.
Start with a clean baseline before your first session. Track shedding weekly. Compare zone scores at 12 and 24 weeks. Bring your data to your clinician so decisions about maintenance sessions are grounded in evidence, not hope.
Track your PRP results objectively
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