Honest evidence
Does PRP Work for Hair Loss? The Honest UK Evidence
PRP for hair loss has real clinical evidence, but it is more mixed and limited than clinic pages selling it let on. Who it actually helps, who it does not, real UK costs, and where SMP fits when PRP cannot.
Search “PRP for hair loss” and you will land on clinic page after clinic page, all selling the same treatment, all fairly upbeat about it. What is harder to find is a straight answer to the question you actually came with: does it work, for people like you, and is it worth what it costs? If you have already had a course of PRP and saw little from it, you are not imagining things either, that is a genuine, documented outcome for a real share of patients, not just a bad run. Kennedy does not offer PRP, so we have nothing to sell you either way. Here is the evidence as it actually stands, who it genuinely helps, what it costs to keep up in the UK, and where scalp micropigmentation fits for the people PRP cannot help at all.
The short answer
PRP (platelet-rich plasma) is your own blood, spun to concentrate the platelets, then injected into the scalp to try to stimulate hair follicles. The real evidence says it can genuinely improve density in some people, but the effect is modest and inconsistent between studies, and the professional body for hair restoration puts realistic success at roughly 30 to 50 percent of patients. It fades without repeat sessions every few months, and it only has any chance of working where follicles are still alive, never on a fully bald area. If your hair loss has gone past that point, or you want a defined result rather than an ongoing gamble, scalp micropigmentation is the honest alternative, because it recreates the look of density with pigment instead of trying to regrow it.
What PRP actually is, and how it is meant to help
PRP stands for platelet-rich plasma. A small amount of your own blood is drawn, spun in a centrifuge to concentrate the platelets to roughly five times their normal level, then that platelet-rich layer is injected back into the scalp. Harvard Health and Johns Hopkins Medicine both describe the same theory behind it: platelets release growth factors that are thought to wake up the stem cells around a hair follicle and improve the blood supply feeding it. Because it is your own blood, there is no donor-tissue infection risk, which is a genuine point in its favour.
That is the theory. Whether it plays out in practice is where the clinic pages get a lot vaguer than the research does.
Does PRP actually work for hair loss?
Yes, in some people, by a real but modest amount, and not consistently. Worth reading slowly rather than taking either extreme at face value.
The strongest single piece of evidence is a placebo-controlled trial: Gentile et al., 2015, a half-head study where each of 20 men received PRP on one side and a placebo on the other. At 24 months, the PRP side had gained a mean of 33.6 more hairs and 45.9 more hairs per square centimetre than the placebo side, which actually got worse over the same period. That is a genuine, measured improvement against a proper control, not a testimonial.
But the same trial found 4 of the 20 patients (20 percent) relapsed between 12 and 16 months and needed retreatment, and a larger, more recent 2024 systematic review of 21 randomised trials in female pattern hair loss, covering 628 women, found something more mixed: hair density improved significantly, but hair count did not improve by a statistically meaningful margin, and the authors flagged high variation between studies in how PRP was prepared and delivered. Density and count are not the same thing, and the gap between them in this review is exactly the kind of nuance a selling clinic tends to skip. Worth being precise here: Gentile’s trial studied men, this review studied women, and Harvard Health’s overall guidance draws on both, so the evidence base does cover both sexes even though no single trial does.
Harvard Health’s own summary is the most useful single line in all of this: PRP “may work best when combined with” minoxidil or finasteride, rather than used on its own, and for hair loss types other than the common genetic pattern, “there is not enough evidence to make conclusions.” The ISHRS, the professional body for hair restoration surgeons, is blunter still: results are inconsistent across studies, PRP is not FDA-approved for hair growth, and realistically “at least 30 to 50 percent of patients will experience some benefit.” Not everyone. Not guaranteed. And Johns Hopkins notes the effect takes at least six months to show and needs repeat treatment to maintain, so it is not a quick or a one-off fix either way.
The clinical evidence for PRP is real, it is just smaller and less certain than a sales page has any reason to tell you.
Who PRP helps, and who it does not
PRP only has a chance of helping where hair follicles are still present and active; it does nothing for a fully bald area, because there is nothing left to stimulate. That candidacy line is the part every clinic page mentions in one sentence and then moves straight past, because it is the part that costs them a customer.
Who PRP is actually for
- Best candidates: early-to-moderate thinning where the follicles are still present and active, most commonly the common genetic pattern (androgenetic alopecia) and early diffuse thinning. This is who the trials above were actually testing.
- Works best combined with medication. Harvard Health's own advice is to pair it with minoxidil or finasteride rather than rely on PRP alone.
- Not for fully bald or heavily miniaturised areas. Multiple clinics state it plainly, and ISHRS confirms it independently: with no living follicle left to stimulate, PRP has nothing to work with, so "individuals who are completely bald in the area of concern are not likely to experience any benefit."
- Not for everyone medically. Bleeding disorders, some autoimmune conditions, active infection at the site, low platelet count and a few other factors rule it out, which is exactly what a proper screening consultation should catch.
That candidacy line, “not suitable once an area is fully bald,” is the single most important sentence in this whole subject, because it is the exact population that scalp micropigmentation is built for.
What does PRP actually cost in the UK?
Commonly quoted across UK clinics, PRP runs roughly £280 to £475 or more per session, putting an initial three-session course at somewhere between £840 and £1,275. The initial course itself typically runs three to six sessions spaced monthly, or every four to six weeks, so budget for a couple of months before you have had the full course, let alone seen a result. This is where clinic pages get noticeably quiet: only two of the six clinic pages we checked state a price at all, the rest ask you to book a consultation to find out, which tells you something about how competitive the honest number is. An independent UK pharmacy guide (not selling PRP itself) puts a full three-to-four session course as wide as £600 to £2,400.
The part that changes the maths is what happens afterwards. To keep any benefit, clinics recommend repeat sessions roughly every three to six months, indefinitely, for as long as you want to hold the result. That is not a one-off spend, it is a subscription with no fixed end date and, per ISHRS, only a 30 to 50 percent chance it is doing much for you at all.
| PRP | Full SMP | |
|---|---|---|
| Structure | 3 to 6 sessions initially, then repeat sessions every 3 to 6 months, indefinitely | 2 to 3 sessions, a one-off treatment |
| Initial UK cost | Roughly £840 to £1,275 for the first course | From £1,000 total |
| Ongoing cost | £280 to £475+ every 3 to 6 months, for as long as you want the result | An occasional touch-up, commonly every 2 to 3 years |
| Who it can help | Only where follicles are still present and responsive | Any level of hair loss, including fully bald |
| Chance of a visible result | Roughly 30 to 50% of patients, per ISHRS | Visible from the first session, built over a planned course |
| What it changes | Tries to biologically stimulate the follicle | Recreates the appearance of density with pigment; does not grow hair |
Neither of these is “better” in the abstract. Someone with genuinely thinning but living hair who wants to try to keep what they have, and is happy to pay repeatedly for an uncertain result, has a real reason to choose PRP, especially alongside minoxidil or finasteride as the evidence recommends. Someone who wants a defined, largely one-off, immediately visible cosmetic result, including anyone PRP has already told them it cannot help, has a genuinely different tool available.
Is PRP safe? The honest risk picture
What we'd say at a consultation
PRP is genuinely low-risk compared with surgery, because it uses your own blood and does not involve a graft or an incision. The common side effects are mild and short-lived: redness, swelling, tenderness or a little bruising at the injection sites, usually gone within a day or two. Rarer risks include an allergic reaction to the local anaesthetic used alongside it, infection, or small hard lumps from inflammation. It is not right for everyone, including people with certain bleeding disorders, some autoimmune conditions, an active infection at the site, or a low platelet count. None of that should put you off asking about it if you are a genuine candidate; it just means a proper screening consultation matters as much as the treatment itself.
Why isn’t PRP available on the NHS?
The NHS’s own hair-loss page does not mention PRP at all, funded or otherwise. It is honest that most pattern-baldness treatments are “not all available on the NHS, so you may have to pay,” because hair loss of this kind is treated as a cosmetic condition once anything medically serious has been ruled out, not an illness. An independent UK pharmacy guide confirms the same for PRP specifically: there is no NICE guidance recommending it for hair loss, so it sits outside NHS commissioning entirely.
That is the same basis Kennedy has always been upfront about for scalp micropigmentation. The NHS lists “Permanent make-up (micropigmentation)” among the private, cosmetic routes too, describing it plainly as a “tattoo used to look like short hair.” Neither PRP nor SMP is a medical treatment the NHS funds. The honest question is not which one is free, because neither is, it is which private route actually suits your situation.
Where scalp micropigmentation fits, if PRP can’t help you
If you have read this far and recognised yourself in the “not suitable” list, fully bald in the area that bothers you, or simply tired of paying for an uncertain result every few months, this is where the two roads genuinely part.
SMP does not compete with PRP on the same ground, because it is not trying to do the same job. It places pigment in the upper layers of the scalp to recreate the appearance of closely-shaved density, and it works precisely because it does not need a living, responsive follicle to succeed. That is not a knock on PRP, which does what the evidence says it does for the right person; it is simply a different tool for the job PRP cannot reach.
The cost shape is different too. Full SMP is a one-off treatment from £1,000, built over 2 to 3 sessions, set against PRP’s repeating cost with no fixed end date. If you have already tried PRP or thought hard about it and want to see whether the other route suits you, a free consultation costs nothing to have that honest conversation. We would also point you toward two other guides where we have been just as upfront: do hair fibres actually work, the cheapest thing worth trying if there is still hair to grip, and scalp micropigmentation regrets, an honest look at what goes wrong with SMP itself and how to avoid it. If a hair transplant, the one route that physically regrows hair, is genuinely what you are weighing up instead, our SMP versus hair transplant guide lays that comparison out too.
The bottom line
PRP for hair loss is not a myth, and it is not a miracle either. The honest middle is the true answer: real trials show real density gains in some people, a large recent review found the same benefit did not hold up on hair count, and the professional body for hair restoration puts the realistic success rate at roughly 30 to 50 percent, best combined with medication rather than used alone. It needs a living follicle to work at all, and keeping any benefit means paying for it again every few months, indefinitely. If that describes a bet you are willing to make, it is worth discussing with a clinic that offers it. If your hair loss has gone further than that, or you simply want a result you can see and budget for once, scalp micropigmentation is the honest alternative, not because PRP failed you, but because it was never built to reach where you are. A free consultation is the easiest way to find out which side of that line you are on.
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Common questions
Does PRP regrow hair permanently?
No, not on the evidence we have. The best placebo-controlled trial (Gentile 2015) showed real density gains from PRP, but 4 of the 20 patients relapsed within 12 to 16 months and needed retreatment. Clinics that get results generally repeat sessions every three to six months indefinitely to hold on to the benefit. If a clinic tells you PRP is a one-off permanent fix, that is not what the research says.
Is PRP worth it for hair loss?
Honestly, it depends on who you are. If you still have living, responsive follicles and are prepared to pay for repeat sessions with no guarantee, PRP has real evidence behind it, particularly combined with minoxidil or finasteride. ISHRS puts the realistic success rate at roughly 30 to 50 percent of patients seeing some benefit, which is meaningful but far from certain. If you want a defined result you can budget for once, or your hair loss has gone past the point PRP can reach, it is probably not worth it for you.
How much do three sessions of PRP cost in the UK?
Commonly quoted across UK clinics at roughly £840 to £1,275 for an initial three-session course, based on per-session prices of around £280 to £475. An independent UK pharmacy guide puts a three to four session course as wide as £600 to £2,400. None of that includes the maintenance sessions every three to six months afterwards, which is the part that adds up over the years. Our own one-off cost for Full SMP is on the prices page for comparison.
Does PRP actually work for hair loss?
Yes, with real but inconsistent evidence. A placebo-controlled trial found genuine density gains against a placebo side that got worse. A larger 2024 review of 21 trials found density improved but hair count did not improve by a statistically meaningful amount, and flagged high variation between studies. Harvard Health's own summary is that PRP works best combined with minoxidil or finasteride rather than used alone. It is a real, evidenced treatment with modest and inconsistent results, not a guaranteed regrowth cure.
Is PRP safe? What are the side effects?
Generally yes. Because it uses your own blood there is no donor-tissue infection risk, and the common side effects are mild and temporary: redness, swelling, tenderness or minor bruising at the injection sites, usually settling within a day or two. Rarer risks include an allergic reaction to the local anaesthetic used alongside it, infection, or small hard lumps from inflammation. It is not appropriate for everyone, including people with certain bleeding disorders or autoimmune conditions, which a proper consultation should always screen for.
What is the difference between PRP and scalp micropigmentation?
They work in completely different ways and suit different people. PRP tries to biologically stimulate follicles that are still alive, so it only has a chance of working where hair is thinning rather than gone, and the benefit fades without repeat sessions every few months. Scalp micropigmentation does not touch biology at all; it places pigment in the skin to recreate the appearance of density or a shaved look, so it works whether or not a follicle is still active underneath. One is an ongoing biological treatment with an uncertain outcome, the other is a cosmetic result you can see from the first session. See our prices page for how the two compare on cost.
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