Hair Boosters, Hair Fillers and Mesotherapy or PRP. Which Scalp Injection Has the Evidence

PRP has 43 randomised trials showing it increases hair density. Mesotherapy cocktails and branded hair boosters have small studies with mixed results, and in a 60-woman comparison mesotherapy produced no measurable improvement while PRP and laser did. The products sit on the same menu at similar prices, and the menu does not say which was tested.

Key points

• A 2025 meta-analysis in Dermatology and Therapy of 43 randomised controlled trials and 1,877 participants found activated PRP increased hair density and reduced recurrence compared with placebo, with PRP plus minoxidil outperforming either alone.

• A study of 60 women with diffuse hair loss, divided equally between low-level laser therapy, mesotherapy and PRP for 3 months with 3 months of follow-up, found significant improvement in pull test, total and terminal hair counts with laser and with PRP, and no similar improvement with mesotherapy.

• A 2023 meta-analysis in Annals of Medicine and Surgery of 9 randomised trials and 230 patients found PRP alone gained 25.39 hairs per square centimetre against placebo and PRP as an adjunct gained 34.38, which is the range any booster would need to match.

• Mesotherapy and hair booster products vary in what they contain, from vitamins and minoxidil to peptides and polynucleotides, and no meta-analysis exists for any of them because the products are too different to pool.

If you have been offered a hair booster or mesotherapy course, message us on WhatsApp or email team@thewellnesslondon.com and a doctor will tell you what the product contains and which treatment the evidence supports for your scalp.

What the products actually are

The term hair booster covers several products that have little in common beyond the scalp they are injected into. Mesotherapy is the oldest, a series of superficial injections of a cocktail that may contain vitamins, minerals, amino acids, minoxidil, finasteride, growth factors or peptides, in proportions that vary by clinic and by supplier and are rarely disclosed to the patient. Branded hair fillers are newer, typically peptide-based gels marketed under trade names and sold as courses of 4 sessions a fortnight apart, with claims of stimulating the follicle and improving scalp condition. Polynucleotide scalp treatments, salmon DNA fragments, have arrived from the facial aesthetics market and are sold for scalp health and hair quality.

PRP is different in one respect that matters for evidence. It is a single, definable product, your own concentrated platelets, that has been tested in dozens of randomised trials. Mesotherapy and boosters are a category, and the evidence for a category is only as good as the evidence for the specific product in the syringe, which for most of them is small studies or none. A clinic that lists them all on one menu at similar prices is asking the patient to choose between a tested treatment and an untested one without telling them which is which. The same question applies to exosome and polynucleotide scalp products and to PRF.

What the trials show for PRP

The 2025 meta-analysis in Dermatology and Therapy searched to July 2025 and identified 43 randomised controlled trials with 1,877 participants assessing PRP for alopecia. Activated PRP increased hair density and reduced recurrence against placebo, improved clinical outcomes and patient satisfaction, and PRP combined with minoxidil outperformed either alone. A 2023 meta-analysis in Annals of Medicine and Surgery of 9 randomised trials and 230 patients quantified the gain at 25.39 hairs per square centimetre for PRP alone and 34.38 when PRP was used alongside other treatments. A 2024 meta-analysis of 14 studies and 431 patients put the gain at 27.55 while rating the evidence low quality with publication bias.

That is the benchmark. A hair booster that wants to be sold as an alternative to PRP needs a randomised trial showing a density gain of that order against placebo, and a booster that wants to be sold as an addition to PRP needs a trial showing the combination beats PRP alone. For most products on the London market neither trial exists, and the marketing fills the gap with language about scalp health, hydration and follicle nourishment that does not translate into a hair count. What PRP itself involves is set out separately.

Send us photographs of your thinning on WhatsApp and a doctor will tell you whether your pattern is one the PRP trials show responding.

What the studies show for mesotherapy and boosters

The most direct comparison is a study of 60 women with diffuse hair loss, divided into 3 equal groups treated for 3 months with low-level laser therapy, mesotherapy or PRP and followed for 3 more, assessed by global photography, trichoscopy and scalp biopsy. The laser and PRP groups showed significant clinical improvement, with the hair pull test falling from around 12 to 5 hairs in each and modest gains in total and terminal hair counts. The mesotherapy group showed no similar improvement on any measure. That is one study and it is small, but it is the study a mesotherapy clinic should be asked about, and few will have read it.

Beyond that the evidence is fragmentary. Small studies of mesotherapy cocktails containing minoxidil or finasteride report benefit, which is unsurprising since those are the licensed drugs delivered by needle. Small studies of peptide fillers report improvement in scalp condition and hair quality on subjective measures with no placebo arm. Polynucleotides for the scalp have facial skin evidence from 2 early 2026 systematic reviews and no hair density trial. None of these has a meta-analysis, because the products are too different from each other to pool, and none has a trial against PRP. A clinic presenting a booster as the newer or gentler alternative to PRP is presenting the absence of evidence as a feature.

What a booster can and cannot add to PRP

Some clinics offer boosters as an addition to PRP, and the honest position on combinations is simple. The one addition with trial support is minoxidil, which the 43-trial meta-analysis found improved results when combined with PRP, and which is available as a topical for pounds a month without a needle. Where the licensed medications sit alongside PRP is worth settling before any extra product is added. For everything else the claim that adding it to PRP improves the result has not been tested, and a patient paying for PRP plus a booster is paying a tested price and an untested one for a combination nobody has measured.

There is a narrow argument for a mesotherapy cocktail that contains minoxidil in a patient who cannot tolerate the topical, and for polynucleotides in a scalp with a specific inflammatory or dryness problem a doctor has identified. In both the product is doing a defined job a doctor can name. What does not have an argument is a menu of 3 injectables sold together at a higher price as a regenerative package, where the tested component is diluted by 2 untested ones and the price is tripled.

Six questions before paying for a hair booster

Take these to whichever clinic you see, including ours.

• What exactly is in the product, ingredient by ingredient, and can I see the manufacturer's sheet.

• Which randomised trial shows this product increases hair density against placebo, and by how many hairs per square centimetre.

• If it is being added to PRP, which trial shows the combination beats PRP alone.

• If it contains minoxidil or finasteride, why is it being injected rather than prescribed as a topical or tablet for a fraction of the price.

• What does the clinic charge for PRP on its own.

• Who is injecting, and are they a GMC-registered doctor.

Our doctors put it this way. Hair boosters are a category, not a treatment, and a category cannot have evidence. Ask what is in the syringe and which trial tested it. If the answer is a brand name and a feeling, you have your answer.

Message us on WhatsApp with your pattern of loss, what you have been offered, and photographs, and a doctor will give you a straight answer.

What PRP does not do either

PRP is not the answer to every criticism of boosters. It has low quality evidence with publication bias in the most cautious meta-analysis, it fades without maintenance, it does not regrow bald scalp, and it works best with minoxidil or finasteride rather than alone. It is a course of 3 with maintenance, and a clinic that sells a single session is selling a demonstration. Its advantage over boosters is not that it is proven beyond doubt. It is that it has been tested 43 times and they mostly have not, and that the one comparison that included mesotherapy found it did nothing. PRP is not available on the NHS for hair loss.

What each costs in London

Flagship Harley Street and Mayfair clinics commonly charge £600 to £850 or more per session of hair PRP, with a course of 3 taking a plan past £2,000. Mesotherapy and branded hair booster courses are priced across a similar range per session, typically sold as courses of 4 to 6, and combination packages of PRP with a booster are priced above either alone.

The reframing is evidence per session. A PRP course buys a treatment with 43 randomised trials. A mesotherapy course at the same price buys a cocktail that produced no improvement in the one study that compared it with PRP. A combination package buys the tested treatment at a higher price for the addition of an untested one. Paying the same for less evidence, or more for none, is the arithmetic the menu hides.

Care at The London PRP Clinic by The Wellness is doctor-led and priced below flagship rates, with your exact figure confirmed at the free suitability review once a doctor has assessed your scalp and the cause of your hair loss.

Ask about the cost for your hair on WhatsApp and we will explain what the review covers.

The free suitability review

Every enquiry here starts with a free, doctor-led suitability review rather than a booking. A GMC-registered doctor examines your scalp, establishes the cause and stage of your hair loss, reviews any product you have been offered elsewhere, and gives one of two answers. Either you are approved for treatment, with a named preparation and the reason it was chosen over the alternatives, or you are not approved, with an honest explanation of what would serve you better, whether that is blood tests, licensed medication, or a transplant opinion.

We decline a meaningful share of the people who enquire. That is deliberate. A clinic that approves everyone is optimising for bookings, not outcomes.

Why people choose The London PRP Clinic by The Wellness

• An 87 percent patient success rate across treatments.

• A 32 percent average density increase reported in our hair restoration programme.

• More than 187 five star reviews.

• Every treatment performed by a GMC-registered doctor.

• 100 supervised treatments completed by every clinician before they treat a patient here unsupervised.

Frequently asked questions

Is mesotherapy or PRP better for hair loss

PRP. It has 43 randomised trials showing it increases hair density. In a 60-woman study comparing laser, mesotherapy and PRP over 6 months, PRP and laser produced significant improvement in pull test and hair counts and mesotherapy did not. Mesotherapy cocktails vary and have no meta-analysis.

What is in a hair booster injection

It varies by product and clinic. Mesotherapy cocktails may contain vitamins, minerals, amino acids, minoxidil, finasteride or peptides. Branded hair fillers are usually peptide gels. Polynucleotide scalp treatments are salmon DNA fragments. Ask for the ingredient list, because the evidence depends entirely on what is in the syringe.

Do hair fillers work

Branded peptide hair fillers have small studies reporting improvement in scalp condition and hair quality on subjective measures, without placebo arms or hair density trials. No trial compares them with PRP or shows they add anything to it. They are sold as courses of 4 sessions at a similar price to a tested treatment.

Can you combine PRP with mesotherapy or a hair booster

Clinics do, but no trial shows any combination beats PRP alone. The one addition with evidence is minoxidil, which the 43-trial meta-analysis found improved results with PRP, and which costs pounds a month as a topical. A combination package prices an untested addition on top of a tested treatment.

How many hairs does PRP add

Pooled analyses put the gain at around 25 hairs per square centimetre for PRP alone and 34 as an adjunct, against placebo, over 3 to 6 months. That is the benchmark any hair booster would need to match in a randomised trial to be sold as an alternative, and none has.

Are polynucleotides good for hair loss

Polynucleotides have 2 early 2026 systematic reviews supporting them for facial skin elasticity and hydration, and no randomised trial showing they increase hair density. For the scalp they are an aesthetics product sold on facial evidence, and a clinic offering them for hair loss should be asked which trial supports it.

References

• Dermatology and Therapy, 2025. Platelet-rich plasma in the management of alopecia, a systematic review and meta-analysis of 43 randomised controlled trials and 1,877 participants. https://link.springer.com/article/10.1007/s13555-025-01542-8

• Benha University, Egypt. Comparative study of low-level laser therapy, mesotherapy and platelet-rich plasma in 60 women with diffuse hair loss, with trichoscopy and scalp biopsy outcomes.

• Annals of Medicine and Surgery, 2023. Novel vs modified platelet-rich plasma therapy for hair loss treatment, a systematic review and meta-analysis of 9 randomised trials and 230 patients. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10289744/

• 2024. Is autologous platelet-rich plasma capable of increasing hair density in patients with androgenic alopecia, a systematic review and meta-analysis of 14 studies and 431 patients. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11551241/

• IAPAM, 2026. Regenerative aesthetics 2026, what the evidence supports, summarising the two early 2026 systematic reviews of polynucleotides for facial skin.

• London clinic price lists for hair PRP, mesotherapy and hair booster treatments, accessed September 2026.

This article is for general information and does not replace a medical assessment. Speak to one of our doctors before deciding on any scalp injection.