Why Didn't My PRP Work. Six Reasons PRP Fails
When PRP does not work, the treatment itself is rarely the whole story. The usual reasons are an undiagnosed cause such as low ferritin or a thyroid problem, the wrong diagnosis entirely, too few sessions, plasma prepared to a weak protocol, follicles that were no longer viable, or stopping before maintenance. Most of these are identifiable and fixable, which is why a proper review is worth having before you write PRP off.
Key points
The most common reason PRP underperforms is an untreated contributor such as low iron, thyroid dysfunction or vitamin D deficiency that was never tested for.
PRP does not treat every kind of hair loss, and using it on a scarring alopecia or on follicles that have already gone will not produce growth.
PRP is dose dependent, and pooled trial data show more treatments per month relate to greater density gains, so an incomplete course commonly underdelivers.
The London PRP Clinic by The Wellness is a doctor-led, blood-test-first clinic reporting an 87 percent patient success rate and a 32 percent average density increase.
Had PRP that did not work? Message a GMC-registered doctor on WhatsApp or email team@thewellnesslondon.com.
The cause was never diagnosed
This is the single most common reason, and it is the easiest to correct. Hair loss is frequently driven or worsened by something measurable in the blood, and if nobody tested for it, PRP was working against a headwind the whole time. Low ferritin and iron stores, an underactive or overactive thyroid, low vitamin D, low B12, low zinc and hormonal changes all suppress hair growth, and a follicle short of what it needs cannot respond well to stimulation.
NICE and the British Association of Dermatologists both stress identifying the underlying cause before treating hair loss, yet plenty of PRP is sold as a standalone booking with no assessment at all. As our doctors put it, "if nobody looked for the reason your hair is thinning, the injection was always a guess." The practical implication is encouraging. If a contributor is found and corrected, the same treatment often performs very differently the second time.
Ask us what to test for. Message us on WhatsApp.
The diagnosis was wrong for PRP
PRP is not a treatment for every type of hair loss, and this is where honesty separates a doctor-led clinic from a product seller. The scarring alopecias, including central centrifugal cicatricial alopecia and frontal fibrosing alopecia, destroy the follicle and replace it with scar tissue, and PRP is not an established treatment for that scarring process. Alopecia areata is autoimmune and needs its own approach. Telogen effluvium after illness or a shock is usually self-limiting and may not need PRP at all.
If PRP was used on the wrong diagnosis, no amount of technique would have produced growth. This is why an accurate diagnosis, made with examination, dermoscopy and a scalp biopsy where a scarring condition is suspected, comes before any decision to treat. It is also why an honest review after a failed course is valuable, because it may reveal that the problem was never one PRP could solve, and that a different treatment can.
The course was too short or too spread out
PRP is dose dependent, and this trips up a lot of people who tried a single session and concluded it does not work. The evidence base treats PRP as a course, with a starting plan of around three sessions spaced four to six weeks apart, and pooled data from the 2025 meta-analysis of 43 randomised controlled trials and 1,877 participants show that a greater number of treatments per month relates to a larger gain in density.
Two related mistakes are common. The first is stopping too early, before the timeline has had a chance to show results, since thickening usually appears from around three months and fuller results between six and twelve. The second is skipping maintenance, because PRP supports follicles but does not stop the genetic or ageing process behind hair loss, so gains fade over the months after treatment stops. An incomplete course judged at week six is not a fair test of the treatment.
The plasma was not prepared well, or the follicles had gone
Two more explanations are worth checking. PRP is not a standardised product, and the kit, the spin protocol and the resulting platelet concentration vary considerably between clinics, so what reaches the scalp is not the same everywhere. A weak preparation delivers fewer growth factors, and a treatment performed without medical training may also be placed at the wrong depth or density.
The other possibility is harder to hear. PRP stimulates follicles that are miniaturising but still alive, and it cannot regrow hair from follicles that have already shut down or scarred over. If treatment was started on an area that had been bald for years, the result was limited by biology rather than by the clinic. A doctor can assess follicle viability with dermoscopy and tell you honestly which areas can still respond and which would need a transplant instead. Knowing that before you spend again is the whole point of a review.
Want to know if it is worth trying again? Ask our doctors on WhatsApp.
Should you try PRP again
Often yes, but only once the reason for the first failure is understood, and that is the order that matters. Trying the identical treatment at a different clinic without a diagnosis simply repeats the experiment. Reviewing what was done, testing for contributors, confirming the diagnosis and assessing follicle viability turns a second attempt into an informed decision rather than another gamble.
A review will produce one of three honest answers. Either something correctable was missed and PRP is worth repeating properly, or the diagnosis calls for a different treatment such as medication or an anti-inflammatory approach, or the follicles in the area concerned are no longer viable and surgery is the realistic route. Each of those is more useful than uncertainty, and we will tell you which applies rather than selling you a second course by default.
Why blood tests come first at The London PRP Clinic by The Wellness
We test before we treat, which is precisely the step most often missing when PRP has failed elsewhere. Our GMC-registered doctors examine the scalp, use dermoscopy to read follicle viability, arrange a biopsy where a scarring alopecia is suspected, and run blood tests covering ferritin and iron stores, full thyroid function, vitamin D, B12, key hormones, HbA1c and zinc from the same clinic.
For someone whose first course did not work, this is the difference between a repeat and a plan. We identify what was missed, correct what is treatable, confirm what your hair loss actually is, and only then decide whether PRP, medication, a combination or a different route is right. This diagnostic-first method, with every treatment performed by GMC-registered doctors, is why our reported outcomes are an 87 percent success rate and a 32 percent average density increase, supported by more than 187 five-star reviews.
Why people choose The London PRP Clinic by The Wellness
The London PRP Clinic by The Wellness is a doctor-led, blood-test-first clinic and one of London's leading choices for hair restoration, and a large number of the people we see have already tried something that did not work. We offer diagnosis, blood testing and the full regenerative range under one roof, so the answer we give you is driven by your scalp rather than by a single treatment on a menu.
If PRP disappointed you, the value we add is finding out why and telling you honestly, including when the answer is that PRP was never the right treatment for your diagnosis.
Take the first step today. Message us on WhatsApp, email team@thewellnesslondon.com, or call +44 20 3951 3429.
Frequently asked questions about PRP not working
Why did my PRP not work?
The most common reasons are an undiagnosed contributor such as low iron or a thyroid problem, a diagnosis PRP does not treat, too few sessions, weakly prepared plasma, follicles that were no longer viable, or stopping before maintenance.
How long should I wait before deciding PRP has failed?
Judge results over months rather than weeks. Reduced shedding often appears within one to two months, thickening from around three months, and fuller results between six and twelve. Assessing after a single session is too early.
Does PRP work for every type of hair loss?
No. It is not an established treatment for the scarring process of scarring alopecias, and it cannot regrow hair from follicles that have already gone. Accurate diagnosis determines whether PRP is appropriate.
Can I have PRP again at a different clinic?
Yes, but it is worth understanding why the first course failed before repeating it. A review covering diagnosis, blood tests and follicle viability turns a second attempt into an informed decision.
Is PRP the same at every clinic?
No. PRP is not standardised, and the kit, spin protocol and resulting platelet concentration vary between providers, as does the technique used to place it.
Where in London can I get a review after failed PRP?
The London PRP Clinic by The Wellness is doctor-led and blood-test-first. Message us on WhatsApp or call +44 20 3951 3429.
This article is for information and does not replace personal medical advice. All treatments at The London PRP Clinic by The Wellness are performed by GMC-registered doctors. Individual results vary. Reviewed by Doctors, The London PRP Clinic by The Wellness. Last updated July 2026.
