PRP For Hair Loss: How Platelet-Rich Plasma Works And What The Evidence Shows
Last reviewed on 4 August 2026. We review our treatment guides every six months to keep them accurate.
Key points
PRP stands for platelet-rich plasma. A small amount of your own blood is taken, spun in a centrifuge to concentrate the platelets, and the resulting plasma is injected into the scalp to try to stimulate the hair follicles. It is sometimes called a blood plasma treatment for hair loss.
Does PRP work for hair loss? There is some genuine evidence it can help pattern (androgenetic) hair loss, but that evidence is limited and of low-to-moderate quality. PRP is not a cure and is not a proven first-line treatment.
A 2024 meta-analysis of 10 randomised trials found PRP produced a measurable increase in hair density, but no change in the thickness of individual hairs, and the effect was stronger in men.
There is no standard recipe. Spin speed, the number of sessions and the gaps between them vary widely between clinics, which makes results inconsistent and hard to compare.
It works best on hair that is thinning rather than on a scalp that is already bald: PRP can support follicles that are still there, but it cannot create hair where the follicles have gone.
It is a course, not a one-off. Any improvement is gradual and not permanent, so repeat maintenance sessions are needed to hold it, and the cost adds up over time.
It is a private, cosmetic procedure using your own blood, not routinely available on the NHS, and best considered as a possible add-on decided with a doctor rather than a replacement for the treatments with the strongest evidence.
Platelet-rich plasma, or PRP, is one of the most talked-about injectable treatments for thinning hair, and it is often presented as a natural way to regrow hair using your own blood. The idea is genuinely interesting and there is some evidence behind it, but it is also frequently oversold, so it helps to separate what the research actually shows from the marketing.
This guide explains what PRP is, how it is supposed to work, whether it works for genetic hair loss, what it can and cannot do for regrowth, how it is used in women, how many sessions are typical and what it tends to cost, and its safety and status in the UK. Because it involves drawing and reinjecting blood, anyone considering it should discuss it with a doctor first. A useful independent overview of PRP in skin and hair medicine is published by DermNet.
What is PRP (platelet-rich plasma)?
PRP is an autologous treatment, which simply means it is made from your own body. A small amount of blood is taken from your arm, much as it would be for a routine blood test, and placed in a centrifuge that spins it at speed. As DermNet explains, this separates the blood into its layers and concentrates the platelets into a small volume of plasma, which is then drawn off and injected into the scalp where the hair is thinning.
Platelets are best known for helping blood to clot, but they are also packed with growth factors, the signalling proteins the body uses to trigger repair and regeneration. The whole premise of PRP is to deliver a concentrated dose of those growth factors to struggling hair follicles, in the hope of nudging them back towards active growth.
PRP is used mainly for androgenetic alopecia, the common pattern hair loss that thins the hairline and crown, and it is sometimes used for alopecia areata, an autoimmune form of patchy loss. It is important to be clear from the start that PRP is intended to support follicles that are still present but underactive. It cannot grow hair on skin where the follicles have already been lost.
How is PRP supposed to work for hair loss?
The rationale is straightforward. The concentrated platelets release growth factors such as platelet-derived growth factor (PDGF), transforming growth factor beta (TGF-beta) and vascular endothelial growth factor (VEGF). In the scalp these are thought to stimulate activity in the hair follicles and encourage the growth of small blood vessels around them, improving the follicle's blood and nutrient supply. The theory is that, over a course of sessions, this helps thinning follicles produce thicker, more active hair.
That is a plausible biological mechanism, and it is the same reasoning that underpins related injectable treatments. But a plausible mechanism is not the same as a proven result. A treatment can trigger the right signals in a laboratory and still make little measurable difference to how much hair a person keeps or regrows. What matters is what happens in actual patients, which is where the evidence, and its limits, come in.
Does PRP work for hair loss?
The honest position is that there is some real evidence PRP can help pattern hair loss, but it is limited, mixed in quality, and does not make PRP a cure or a proven first-line treatment.
The most useful single overview is a 2024 meta-analysis published in Aesthetic Plastic Surgery, which pooled 10 randomised controlled trials covering 318 people with androgenetic alopecia. It found that PRP produced a statistically significant increase in hair density compared with a control, of about 25 hairs per square centimetre. That is a genuine, positive signal from the better sort of evidence, and it deserves to be stated plainly.
Two details in the same analysis matter, though. First, PRP increased the number of hairs but did not significantly change the thickness of each individual hair. Second, the effect on density was more pronounced in men. So the picture is of a modest, measurable benefit for the right person, not a dramatic transformation.
How good is that evidence?
Encouraging, but not strong enough to treat PRP as a settled, reliable treatment, for a few specific reasons.
The studies are small and vary in quality. Most trials of PRP for hair are small, and their results are described as limited and of low-to-moderate quality. Findings from small studies can be influenced by chance and by how carefully each trial was run.
There is no standard protocol. This is the single biggest problem. Clinics differ in how fast and how long they spin the blood, how much they inject, how many sessions they give and how far apart. Because the preparation is not standardised, one clinic's PRP is not necessarily the same as another's, which makes results inconsistent and hard to compare between studies or between providers.
It is not a cure and not first-line. Even where PRP helps, the benefit is partial and it does not stop the underlying process driving pattern hair loss. The treatments with the strongest evidence for androgenetic alopecia remain the medical mainstays, covered in our guides to finasteride and minoxidil. PRP is best thought of as a possible add-on to those, not a substitute for them.
Put together, PRP is a reasonable idea with a real but limited evidence base. It appears to help some people with early-to-moderate pattern hair loss, particularly as part of a wider plan, but it is not guaranteed, and the lack of a standard method means results are unpredictable.
Does PRP work for genetic (pattern) hair loss?
Genetic hair loss, properly called androgenetic alopecia, is the main use for PRP and the setting the research above was carried out in. So this is the situation where PRP has the most support: in early-to-moderate pattern thinning, where plenty of follicles are still alive but shrinking, PRP may help improve density as part of a treatment plan. The further loss has progressed, and the more the scalp has become genuinely bald, the less there is for PRP to work with.
Does PRP regrow hair?
Within limits. PRP can help thinning follicles produce fuller hair, so in suitable cases it can improve how dense the hair looks. What it cannot do is create new hair on a bald scalp. Once follicles have been lost, no injection can bring them back, and the only way to place hair into a truly bare area is a hair transplant, which moves living follicles from elsewhere on the scalp. For anyone weighing up whether their own hair can be improved without surgery, our guide on whether you can naturally regrow hair sets out what is and is not realistic.
PRP for hair loss in women
PRP is used in women as well as men, and female pattern hair loss was included in the trials behind the evidence above. The one caveat worth knowing is that, in the 2024 meta-analysis, the measurable gain in hair density was more pronounced in male participants. That does not mean PRP has no role for women, but it does mean the evidence for a clear benefit is currently stronger in men, and a doctor can help judge whether it is worth considering in an individual woman's case, often alongside other options for female hair loss.
What are the benefits of PRP for hair?
Set against realistic expectations, the practical attractions of PRP are:
It uses your own blood with nothing else added, which keeps the risk of an allergic or immune reaction very low.
It is non-surgical and involves only injections, so there is little or no downtime and most people return to normal activities the same day.
Where follicles are still present but thinning, a course may improve density and the general look of the hair.
It can be combined with other treatments, and is sometimes used alongside the medical mainstays or around a hair transplant, on a doctor's advice.
The honest counterweight to all of these is that the benefit is modest and not guaranteed, results are gradual and fade without maintenance, and PRP does nothing for areas that are already bald.
How is PRP different from other injectable treatments?
PRP is the most established of a family of injectable and needle-based scalp treatments, most of which share the same aim of delivering growth-promoting signals to the follicles. If you are comparing options, we have neutral guides to PRF injections, exosome therapy, mesotherapy and microneedling. Of these, PRP has the largest body of evidence, though as above it is still limited.
How many PRP sessions are needed, and what does it cost?
There is no single agreed schedule, but a common approach is an initial course of around three sessions roughly a month apart, followed by maintenance sessions every few months to hold any improvement. Because the effect is gradual and not permanent, PRP is an ongoing commitment rather than a one-off, and stopping usually means any gains slowly fade.
On cost, PRP for hair loss is a private, cosmetic treatment and is not routinely funded on the NHS, so you would be paying for it yourself. Prices vary a great deal by clinic, location and the number of sessions, and because it is a repeated treatment the total over a year matters more than the price of a single session. It is worth asking any clinic for its full costs, including maintenance, before committing, and weighing that against treatments with stronger evidence. We have deliberately not quoted a figure here, because prices differ so widely that any single number would be misleading.
Is PRP safe, and who should avoid it?
Because PRP uses only your own blood, the safety picture is generally good, and the risk of an allergic reaction is low. The usual effects are short-lived: tenderness, mild swelling, redness or bruising at the injection sites, and sometimes a headache or light-headedness around the blood draw. As with any procedure that breaks the skin, there is a small risk of infection, which is why sterile technique and a properly trained practitioner matter.
PRP is not suitable for everyone. DermNet lists conditions in which PRP should be avoided, including a very low platelet count, active infection, chronic liver disease and being on anticoagulant (blood-thinning) medication. This is exactly the kind of judgement that needs a doctor: a proper medical assessment beforehand is the right way to check whether PRP is appropriate for you, rather than deciding from a treatment menu.
Where does this leave PRP?
PRP for hair loss is a legitimate, low-risk idea with a sensible rationale and some real evidence of a modest benefit for pattern hair loss, particularly early on and particularly in men. But it is not a cure, the evidence is limited and inconsistent because there is no standard method, and it needs ongoing maintenance to keep any result. It is best thought of as a possible addition to a wider plan, decided with a doctor, not as a replacement for the treatments with the strongest evidence. If you are also considering a hair transplant or another scalp treatment, discuss PRP with your own surgeon or doctor first, since injections can affect the timing of other treatment.
Frequently asked questions
Does PRP work for hair loss?
There is some genuine evidence that it can help, but it is limited. A 2024 meta-analysis of 10 randomised trials found PRP produced a measurable increase in hair density in pattern hair loss, though not in the thickness of individual hairs. It is not a cure, the evidence is of low-to-moderate quality, and because clinics use no standard method the results are inconsistent, so it is best seen as a possible add-on decided with a doctor.
Does platelet-rich plasma work for genetic hair loss?
Genetic, or androgenetic, hair loss is the main use for PRP and where it has the most support. In early-to-moderate pattern thinning, where follicles are shrinking but still alive, PRP may help improve density as part of a treatment plan. It works less well the more advanced the loss is, and not at all on a scalp that is already bald.
Does PRP regrow hair?
It can improve density where follicles are still present but underactive, so hair can look fuller. It cannot create new hair on a bald scalp, because once follicles are lost no injection can replace them. Placing hair into a truly bare area needs a hair transplant, not PRP.
Does PRP work for women?
PRP is used in women as well as men, and female pattern hair loss featured in the trials behind the evidence. The main caveat is that the measurable gain in hair density was more pronounced in men, so the evidence for a clear benefit is currently stronger in men. A doctor can advise whether it is worth considering in an individual woman's case.
How many PRP sessions will I need?
There is no fixed protocol, but a common plan is around three initial sessions about a month apart, then maintenance every few months. Because the effect is gradual and fades without top-ups, PRP is an ongoing course rather than a one-off, and any improvement usually takes a few months to show.
How much does PRP for hair loss cost, and is it on the NHS?
PRP for hair loss is a private, cosmetic treatment and is not routinely available on the NHS. Costs vary widely by clinic, location and number of sessions, and because it is repeated the yearly total, including maintenance, matters more than a single session price. Ask any clinic for its full costs before committing.
Is PRP safe?
Because it uses only your own blood, PRP is generally well tolerated, with a low risk of allergic reaction. The usual effects are temporary tenderness, swelling, redness or bruising at the injection sites, plus the small infection risk of any injection. It is not suitable for everyone, including people with a very low platelet count, active infection, chronic liver disease or on blood-thinning medication, so a medical assessment beforehand is important.
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