Exosome therapy in London: what is legal, what the evidence shows, and what it costs

Much of what is written about exosome therapy describes injecting the product, rarely says that exosomes cannot be injected in the UK, and does not tell you what to ask about where the exosomes came from. This guide is written by the team that offers exosome therapy at our clinic on Devonshire Place and reviewed by our clinician. It gives you the UK rules as far as they can be pinned down, the sources of the products, the trials with their sizes and limits, how we price it, and the questions that separate a careful clinic from a careless one.

What exosomes are, and what "exosome therapy" actually is

Every cell releases small sealed packets called extracellular vesicles, and exosomes are the smallest class, 30 to 150 nanometres across. They carry proteins, fats and fragments of RNA from the cell that made them, and in the body they are one of the ways cells signal to each other. An exosome product is not a living cell and contains no stem cells; it is the material cells have shed, collected from a culture or a tissue, purified, and usually freeze-dried into a vial.

In an aesthetic clinic the treatment has two parts. The skin or scalp is first opened with microneedling, radiofrequency microneedling or a fractional laser, which is where any discomfort and downtime come from. The exosome serum is then applied to the treated surface; the idea is that it reaches the channels the needles made, and how much gets through has not been shown. That is the whole procedure. Clinics quote about half an hour for a scalp, longer with the microneedling of a face.

Where the exosomes come from matters more than the brand name. Outside the UK and Europe many facial exosome products are grown from human stem cells, from umbilical cord, placenta or liposuction fat. In the UK and Europe the products sold for cosmetic use are described as plant-derived or animal-derived: rose or other plant cells, bovine colostrum, salmon, red deer umbilical cord cells. Some brands are described differently by different sellers, and a 2025 television investigation of 50 UK clinics, reported by Aesthetics Journal in November 2025, found almost a quarter admitting to a product derived from human stem cells. Ask, and ask for the paperwork.

Are exosomes legal in the UK?

The honest answer has three parts, and all of them rest on industry and government statements rather than on a published regulator's page, which is itself a sign of how new this field is.

• Topical, non-human-derived exosome products applied after microneedling are sold as cosmetics and are described by Save Face, the training provider Harley Academy and clinic doctors as the safest and most compliant route, provided the product meets cosmetic product rules; Harley Academy calls the status a grey area.
• Human-derived exosomes in cosmetics are banned. The Department for Business and Trade told a trade journal in November 2025: "Cosmetics containing exosomes from humans are banned in the UK." On our reading that covers products from placenta, umbilical cord, fat or foreskin.
• Injecting exosomes for aesthetic purposes is ruled out by the accreditation body Save Face, which says the medicines regulator considers injected exosomes to be medicinal products and that injectable exosome therapies have no UK marketing authorisation, a reading clinic doctors share. We could not find a page on the medicines regulator's own site that says this in its own words, so we report it as they report it. In the United States the Food and Drug Administration said in December 2019 that "there are currently no FDA-approved exosome products" and warned of serious adverse events in Nebraska patients treated with unapproved products marketed as containing exosomes.

What this means for you: a clinic in the UK should be able to tell you the product's name, its non-human source and its manufacturer, show you its documentation, and confirm it is applied to the skin and not injected. We do not inject exosomes, and we name the product we use at your consultation.

One more regulatory marker. In May 2026 the Advertising Standards Authority upheld a complaint (ruling A25-1319497) against a skincare brand's "Exosome Face Lift" listing for claiming it was "clinically proven to lift the skin by 20%": the study had 30 subjects and no control group, and the penetration test used one person's arm. Any clinic that says "clinically proven" about an exosome serum faces the same test.

Does exosome therapy work? What the evidence shows

Early, small and encouraging in places; that is the fair summary, and the detail matters.

Hair. A 2025 systematic review found eleven studies of exosomes for hair loss, about 298 patients in all, two of them randomised. Every study reported improvement on at least one measure and none reported a serious adverse event; the authors called the evidence early. The largest placebo-controlled trial, in 85 people, combined adipose-derived exosomes, a human source that the UK cosmetics ban would cover on our reading, with microneedling and found about 35 more hairs per square centimetre at 12 weeks against 3 with placebo; a second review rated it at high risk of bias. A 2026 review of microneedling-plus-exosome studies reported hair density rising from about 158 to 166 hairs per square centimetre at 24 weeks, about 5%. Another 2025 review found that only six of its 26 studies tested exosomes, with 5 to 85 participants each, three of them at high risk of bias, and concluded that "no direct comparisons between exosomes and PRP exist".

Skin. A split-face trial in 25 people, with a product from an exosome developer, found acne scars improved 32.5% when an adipose stem cell exosome gel followed fractional laser, against 19.9% with laser alone. A split-face trial in 28 people found microneedling with an exosome solution beat microneedling with saline on wrinkle, elasticity, hydration and pigmentation measures at 12 weeks. Both used human adipose-derived products, which the UK cosmetics ban would cover on our reading, and both are small. The 2026 review of microneedling with exosomes found sample sizes "uniformly small", follow-up never beyond six months, and the regulatory status of the products "undisclosed across all relevant studies".

What that adds up to. For hair, a modest gain over microneedling alone in the better trials, measured over three to six months, with no trial of the branded products sold in UK clinics. For skin, a plausible addition to the result of microneedling or laser, measured for three months in a handful of people treated with human-derived products. Nobody has shown how long any of it lasts. Any page that promises to regrow hair, or quotes a thousand times the potency of PRP or 891% more elastin, is quoting laboratory work or a study we could not trace.

The dark side: what can go wrong

The risks people search for are real, and they divide into the ones that come from the procedure and the ones that come from the product.

From the microneedling or laser: redness, swelling, pinpoint bleeding, tingling and a burning feeling for a few days. In the hair trials these happened at the same rate in the exosome and the placebo groups, which suggests the needling, not the serum, drives them.

From the product: the serious reports each have their own feature. The US regulator's 2019 notice followed serious adverse events in Nebraska patients treated with unapproved products marketed as containing exosomes; a later review links infections to a placenta-derived product made in substandard conditions. A 2025 case series describes four women with nodules, scarring and pigmentation after unbranded exosome cosmetics were injected into their skin outside medical supervision. One review lists granulomas, pigmentation and anaphylaxis "mainly with injection". A Cambridge cell biologist has warned, in a report carried by the Guardian, that human-derived products carry a disease-transmission risk and that exosomes cannot be reliably separated from viruses, and that a melanoma on the face could be made worse, which he put as "pouring petrol on the fire"; a UK training provider calls the cancer research mixed. We found no safety data beyond about twelve months for repeated use of any exosome product on skin or scalp.

So the dark side is this: a lightly regulated market, products whose source is described inconsistently, injection where the compliant route is topical, and a claim the advertising regulator has already ruled against. The protection is boring and procedural: a named product, a non-human source with documentation, topical application by a trained clinician, and a consultation that rules you out if you should not have it.

Who it suits, and who it does not

Exosome therapy suits adults with early hair thinning who want to add something to microneedling, and adults who want to add to a microneedling or laser session, with realistic expectations and a budget for a course. It does not suit anyone looking for a cure for hair loss, a replacement for licensed medicines, or a "stem cell facelift".

Who should not have it, drawn from clinic consent lists and the microneedling literature (there is no manufacturer's contraindication list for a cosmetic serum):

• Pregnancy.
• An active skin or scalp infection, a cold sore, active acne, eczema or rosacea in the area, or a mole that has changed.
• Autoimmune disease, immunosuppression, a clotting disorder, keloid scarring, or isotretinoin (Roaccutane) in the last six months, for the microneedling; the full list is the clinician's at your consultation.
• A known allergy to any component of the product, which is why we show you what is in it.

We do not offer Botox or dermal fillers. If you have had injectables elsewhere, we wait two weeks after Botox and four after filler before treating the area.

What a session is like, step by step

1. Consultation. The clinician examines your skin or scalp, asks about your medical history and what you have already tried, shows you the product and its documentation, and says whether exosomes add anything for you. You get a plan and a price in writing. Consultations and follow-up reviews are free.
2. Preparation. In our practice, numbing cream for the face if microneedling is planned, and the scalp usually treated without. No make-up or hair products on the day.
3. Microneedling. A device with fine needles passes over the area to open thousands of tiny channels. On the face this stings and the skin reddens; on the scalp most people describe pressure and prickling.
4. The exosomes. The vial is opened and the serum is applied to the freshly treated skin and worked in, in the same visit. Nothing is injected.
5. After. You leave red and a little swollen. In our experience most people go back to work the next day. Avoid sun, make-up, sweating and active skincare for a day or two, and do not wash the scalp for the period your clinician gives you.

How many sessions, when you see the result, how long it lasts

Is one session enough? For skin, one session gives you one microneedling with a serum on top, and clinics plan three or four. For hair, no. A single "exosome facial" is a facial.

What exosome therapy costs in London

Exosome therapy is priced per session, often as an add-on to the microneedling or laser it rides on, and hair and skin are sometimes priced the same and sometimes not.

We price exosome therapy from a starting price per session and per course, confirmed in writing at your free consultation, and we price match any comparable written quote. Consultations and follow-up reviews are free whatever you decide.

Treat a very cheap offer as a reason to ask who treats you, what is used, and what happens if something goes wrong.

Exosomes compared with the alternatives

The status and evidence rows are from the sources named in this guide; the session and downtime rows reflect published protocols and our experience.

Exosomes vs PRP. PRP has the larger body of randomised trials for hair and uses your own blood, with no question about its source; exosomes have a handful of small trials and a product you must vet. No trial has compared them directly, so any page that says exosomes are "more potent than PRP" is guessing. Some clinics combine them; we found no trial of the combination.

Exosomes vs minoxidil and finasteride. Not a fair fight, and we say so: the licensed medicines have the larger evidence base and are the first conversation with a GP or dermatologist. Exosomes are an adjunct for people who have tried them or cannot take them, not a substitute. Finasteride has had UK safety updates, which are a conversation for your prescriber.

Exosomes vs a transplant. A transplant moves hair to where there is none; exosomes, at best, thicken what is there. If you have a bald area, no serum will fill it.

How to choose an exosome clinic in London

• Ask the product's name, its source and its manufacturer, and ask to see the paperwork. If the answer is "premium exosomes" or "stem cells", walk away.
• Ask how it is applied. Topically, after microneedling or laser. If they inject it, Save Face says that is a medicinal product with no UK authorisation, and the nodules and scarring on record followed injections.
• Ask who holds the needling device and who supervises. Ours is a doctor-led team, and this guide is reviewed by Dr Marie Duggan, GMC 7488383; the clinic is CQC registered.
• Ask what the evidence is, in numbers. Thirty-five hairs per square centimetre at twelve weeks, in a trial rated at high risk of bias, is the honest best; "regrows hair" is not.
• Ask what the price covers. The microneedling, the vial, the number of sessions, the review.
• Treat "clinically proven", "stem cell", "FDA approved" and "100% natural" as warning lights. The advertising regulator ruled on the first in 2026 and the US regulator said plainly in 2019 that the third is false.
• Check the reviews, and where they come from. Ours are collected through review.clinic, and the badge on this page links to them: 4.8 out of 5 from 53 reviews in October 2026, with 100% of reviewers saying the treatment was worth it.

Aftercare

Follow the written sheet your clinician gives you. In outline: no make-up, sweating, swimming, saunas or active skincare (retinoids, acids, exfoliants) until the redness has gone, usually a day or two; sun protection every day; for the scalp, no washing for the period you are given and no styling products for a day; sleep on a clean pillowcase. Tell us about spreading redness, pus, a cold sore, a lump that forms under the skin, or a patch of skin that darkens rather than fades.

Frequently asked questions