PRP and PRF can help some people with pattern hair loss, but the evidence is weaker and less consistent than clinic marketing suggests. PRP has a modest, inconsistent benefit across small trials. PRF has even less research behind it. Neither has been shown to match the proven drugs, and neither replaces a hair transplant in areas that are already bald.
Walk through almost any hair loss clinic's website and you'll see PRP (platelet-rich plasma) and, increasingly, PRF (platelet-rich fibrin) described as natural, cutting-edge ways to regrow hair. This guide looks past the marketing. It explains what each treatment actually is, what the published clinical trials found (including the ones that didn't go well), and how both stack up against the other hair loss treatments available today.
What PRP and PRF actually are
Both start the same way: a small blood draw from your arm, spun in a centrifuge to concentrate platelets, then injected into the thinning areas of the scalp. The idea is that platelets carry growth factors (PDGF, VEGF, TGF-beta and others) that may push weakened follicles back into their growth phase. The difference is in how the blood is processed.
PRP (platelet-rich plasma) is the first-generation product. An anticoagulant is added to the blood so it stays liquid, and it's usually spun at higher speed, often twice. The result is a liquid concentrate that releases most of its growth factors quickly after injection.
PRF (platelet-rich fibrin) is often called a second-generation platelet concentrate. Blood is drawn with no anticoagulant and spun once at low speed. Because nothing stops it from clotting, the plasma begins forming a fibrin mesh that traps platelets and white blood cells. The injectable version (i-PRF) is drawn up before it fully gels. Proponents say the fibrin acts as a scaffold that releases growth factors slowly over days rather than minutes.
Researchers have formally classified these products since 2009, sorting them by whether they contain white blood cells and how dense their fibrin network is (Stevens & Khetarpal, review). The slow-release advantage of PRF comes largely from lab and dental research, where lowering centrifuge force increased growth factor release over 14 days in cell cultures (Choukroun group, low-speed centrifugation studies). That is a plausible mechanism, not proof of more hair on a human scalp.
| PRP | PRF | |
|---|---|---|
| Anticoagulant | Yes | No |
| Spin | Higher speed, often two spins | Low speed, one spin |
| Final form | Liquid | Liquid that turns into a fibrin gel |
| Growth factor release | Fast (mostly within hours) | Slower, sustained (per lab studies) |
| White blood cells | Varies by system | Usually retained |
| Time in use for hair loss | Since the early 2010s | Newer; most hair studies since 2018 |
Sources: Stevens & Khetarpal review; Choukroun low-speed centrifugation studies.
What the research says about PRP
PRP for androgenetic alopecia (male and female pattern hair loss) has been studied in dozens of trials. Pooled together, they point to a real but modest gain in hair density. Look at the individual studies, though, and the picture gets messier: small sample sizes, inconsistent protocols, and some well-designed trials that found no difference from saline.
The meta-analyses: a signal, with big caveats
Kieling et al., 2024 (Anais Brasileiros de Dermatologia), a review of randomized trials only, found PRP added about 27.5 hairs/cm² over placebo. But the trials disagreed with each other so much (heterogeneity of roughly 96%) and showed signs of publication bias that the authors called for more high-quality trials before drawing firm conclusions. Hair thickness did not improve significantly. (PMC11551241)
J Cutan Med Surg, 2023 pooled 9 randomized trials covering 238 patients and found hair density was significantly higher than placebo at 3 and 6 months. (PubMed 37533146)
Li et al., 2023 (Aesthetic Plastic Surgery) pooled 10 randomized trials. Eight of the ten used a split-scalp design, where one side of the head gets PRP and the other gets saline. (Springer)
Note the size of these studies. Nine trials and 238 patients is the entire evidence base for one of those reviews. For comparison, finasteride was approved on the strength of trials enrolling well over a thousand men.
Trials that favored PRP
Dubin et al., 2020 (JAAD): 30 women randomized to PRP or saline injections at weeks 0, 4 and 8. On blinded photo review at 24 weeks, 57% of the PRP group improved versus 7% of the saline group. (PubMed 32649961)
Tawfik & Osman, 2018: a half-head study in 30 women found significantly better density and thickness on the PRP side, holding through 6 months. (PubMed 28503741)
Trials that didn't
Shapiro et al., 2020 (JAAD, NYU): 35 patients had two squares tattooed on the scalp, one injected with PRP and one with saline, three monthly sessions. The PRP side gained about 20 hairs/cm². But the saline side also gained about 16, and the difference between them was not statistically significant. Notably, the study was funded by a PRP device maker (Regen Lab). (em-consulte abstract)
Puig et al., 2016 (Dermatologic Surgery): a double-blind trial in women found no statistically significant difference in hair count or hair mass index between PRP and saline, although more PRP patients said their hair felt better. (PubMed 27608205)
Bruce et al., 2020 (Dermatologic Surgery): in women, PRP improved hair count, but topical minoxidil foam improved more measures, including terminal hair density and thickness. The authors concluded PRP works but not as well as minoxidil. (PubMed 31574029)
Why results vary so much
There is no standard PRP. Clinics use different kits, one spin or two, with or without an activator, different platelet concentrations, injection depths and schedules. A blinded pilot by Siah et al., 2020 found large swings in growth factor levels from one patient's PRP to the next, and density gains tracked with one growth factor's concentration. That likely explains why one clinic's results don't predict another's. (Bradford Scholars)
Split-scalp designs add another problem: injected PRP can spread to the "placebo" side, and needling itself injures the scalp in a way that may stimulate growth. Shapiro's team flagged both as possible reasons the saline side also improved.
What the research says about PRF
PRF's hair loss research is early: a handful of small studies, most from single centers, with no large placebo-controlled trial yet. The studies that compare it to PRP have favored PRF, but none is strong enough to settle the question.
Schiavone et al., 2018 (Dermatologic Surgery): the study most often cited by clinics. Patients treated with injectable leukocyte- and platelet-rich fibrin scored better than a comparison group on physician assessment, across ages and both sexes. It was a controlled before-and-after study, not a randomized trial, and the authors described the findings as preliminary. (PubMed 30045107)
Rani et al., 2024 (Biological and Clinical Sciences Research Journal): 100 patients in Pakistan randomized to injectable PRF or PRP. At 6 months the PRF group showed better density, thickness and satisfaction, with fewer side effects. The published abstract does not report effect sizes, and it appears in a small journal. (BCSRJ)
El-Sahar et al., 2025 (Egyptian Journal of Hospital Medicine): 20 FUE transplant patients randomized to PRP or platelet-rich fibrin matrix alongside surgery. The fibrin group had higher density, graft survival and satisfaction. With 10 patients per arm, it needs confirmation, as the authors note. (EJHM)
Arch Dermatol Res, 2025: an uncontrolled study reported an 80% response rate at 6 months with injectable PRF. Without a comparison group, it can't separate PRF's effect from natural variation or other treatments. (PubMed 40009221)
Cureus systematic review, 2024: much of the injectable PRF literature on hair loss consists of case series with as few as three or four patients. (Cureus / PMC11247247)
Better evidence may be coming. A split-scalp trial at Siriraj Hospital in Bangkok is comparing PRF on one side of the head to PRP on the other in women with pattern hair loss, with follow-up out to 6 months after the last session (ClinicalTrials.gov NCT06440655).
PRP vs. PRF side by side
On the evidence, PRP is the better-studied treatment and PRF is the more promising but less proven one. If a clinic tells you PRF is "stronger" or "longer lasting," that claim rests mainly on lab studies and a few small comparisons.
| PRP | PRF | |
|---|---|---|
| Placebo-controlled trials in hair loss | Dozens, mostly small; results mixed | Few to none of quality |
| Meta-analyses | Several; modest density gain, low evidence quality | None for hair loss specifically; reviews lean on case series |
| Head-to-head vs. the other | A few small trials, all favoring PRF | Same trials |
| Typical trial schedule | 3 sessions, about a month apart | Similar, about 3 monthly sessions |
| Preparation | Standardized kits, but many different systems | Must be spun within minutes before blood clots; less standardized |
| Common side effects | Scalp pain, tenderness, brief swelling or headache | Similar; no anticoagulant, so no citrate-related reactions |
| Best supported use | Early-to-moderate pattern thinning | Unclear; mostly studied alongside other treatments |
Both require maintenance sessions. Platelet treatments don't block DHT, the hormone that drives pattern hair loss.
Common clinic claims vs. what the evidence shows
| What you'll hear | What the evidence shows |
|---|---|
| "FDA-approved" | Neither PRP nor PRF is FDA-approved for hair loss. At least 20 centrifuge devices have 510(k) clearance for preparing PRP, which means they're similar to devices already on the market, not that they've been proven to grow hair. Using them for hair loss is off-label. (MDedge / The Hospitalist) |
| "Clinically proven" | Pooled studies show a modest density gain, but evidence quality is rated low to very low, and some rigorous trials found no difference from saline. |
| "PRF is the stronger, longer-lasting upgrade" | Plausible in the lab. In people, supported by a handful of small trials, mostly single-center. |
| "Works for everyone" | Responses vary widely between patients, partly because the platelet product itself varies. |
| "A natural alternative to medication" | In the one head-to-head trial in women, topical minoxidil beat PRP on more measures. A large 2018 network analysis found PRP roughly comparable to minoxidil and finasteride but rated the PRP evidence very low quality. |
| "Regrows hair where you're bald" | Trials measure density in thinning areas. Platelets act on existing follicles; no trial shows they create new follicles where they're gone. |
| "Safe, no side effects" | Mostly true: no serious adverse events in the major trials. Expect scalp pain, tenderness and some swelling. |
How PRP and PRF compare to other hair loss treatments
The medications have far stronger evidence than either platelet treatment, and a hair transplant is the only option that puts hair back where follicles are gone. PRP and PRF fit best as add-ons for people who are thinning, not as replacements for proven treatment.
| Treatment | FDA status for hair loss | Strength of evidence | What the research shows |
|---|---|---|---|
| Finasteride 1 mg (oral) | Approved (men) | High | In two Phase III trials of 1,553 men followed up to 5 years, finasteride cut the odds of further visible hair loss by 93% vs. placebo (PubMed). Possible sexual side effects. |
| Minoxidil, topical | Approved | High | First-line for men and women. Beat PRP on more measures in a head-to-head trial in women (PubMed). Must be used daily. |
| Minoxidil, low-dose oral | Off-label | Moderate | 5 mg daily matched topical minoxidil in a 90-man double-blind trial (AAFP); 2.5 mg performed close to 5 mg with fewer side effects in a 2025 trial (summary). Unwanted body hair is common. |
| Dutasteride 0.5 mg (oral) | Off-label (US) | Moderate | Ranked most effective of the drug options in a 2025 network meta-analysis (Gupta et al.). |
| Low-level laser therapy | Devices cleared | Low | Ranked well in network meta-analyses, but evidence quality was rated low (Gupta et al., 2018). |
| Microneedling + minoxidil | Procedure; not drug-approved | Low to moderate | In a 100-patient trial, hair count rose 91.4 with microneedling + minoxidil vs. 22.2 with minoxidil alone at 12 weeks (Dhurat et al.). A 2025 meta-analysis confirmed the benefit with wide variation between trials (Arch Dermatol Res). |
| PRP | Not approved; devices cleared | Low to very low | Modest density gain in pooled trials; mixed individual results. |
| PRF | Not approved | Very low | Early, small studies; promising but unconfirmed. |
| Hair transplant (FUE/FUT) | Surgical procedure | Established practice | Moves DHT-resistant follicles from the back of the scalp to thinning or bald areas, where they keep growing. The only option here that restores hair where follicles are gone. |
Evidence ratings reflect the published trial base summarized in this article, not a formal grading.
Moves DHT-resistant follicles from the back of the scalp to thinning or bald areas, where they keep growing. The only option on this list that restores hair where follicles are gone.
What about combining treatments? It's common to pair PRP with minoxidil or finasteride, but a 2023 meta-analysis found PRP improved density on its own and the data couldn't yet justify the combination over PRP alone (PMC10289744). Some surgeons also use PRP or PRF around a transplant to support graft healing, as in the small El-Sahar trial above.
The bottom line
PRP is a reasonable add-on for early-to-moderate thinning, with real but modest and inconsistent results. PRF may turn out to be better, but today that's a hypothesis, not a finding. Neither should be your first or only treatment, and neither can fill in areas that are already bald.
Platelet treatments make the most sense for people who:
Have early-to-moderate thinning with follicles still present
Can't tolerate or don't want finasteride or minoxidil, and accept a less certain result
Want to support results alongside proven medication or a transplant
Questions to ask any clinic offering PRP or PRF
Which system do you use, and what platelet concentration does it produce?
How many sessions, how far apart, and what does maintenance cost after the first year?
Which published studies support the protocol you use?
How do you measure results: standardized photos, hair counts, or trichoscopy?
Would medication or a transplant serve me better, and can these be combined?
A clinic that answers these openly, and talks about proven options too, is giving you advice rather than a sales pitch.
