GLP-1 patches: do they work? Ingredients, reviews, ASA ruling

On 15 July 2026 the Advertising Standards Authority banned a Facebook advert for a product called simply "GLP-1 Patch". The advert invited viewers to "take control of your cravings and metabolism" and set the product against "those sharp things once a week". The seller told the regulator its patches contained no semaglutide, no tirzepatide and no other medicinal substance. That was the problem: an advert for GLP-1 patches made of non-medicinal ingredients was implying the effects of a prescription injection.

That is the commonest kind of GLP-1 patch, a sticker impregnated with plant extracts and sold under the name of a hormone. A second kind is more worrying: patches sold online as if they really contained a GLP-1 medicine. When France's medicines agency, the ANSM, sent some of those to the laboratory, it found no trace of the molecules and called the products fraudulent. Either way the buyer is left with the same simple question: does it do anything?

One name, two unrelated products

The term "GLP-1 patch" covers two objects with nothing in common but the marketing.

The first is a matter for medicines enforcement. The second, for consumer protection. In both cases the letters "GLP-1" on the packaging match nothing inside it.

Why a GLP-1 medicine cannot get through a simple patch

Skin is a barrier designed to let nothing in, and it does its job well with large molecules.

Dermatologists have long worked to a rule of thumb, set out in Experimental Dermatology, 2000: above about 500 daltons, a molecule barely crosses the outer layer of the skin at all. The substances delivered by everyday medical patches, nicotine for example, are all below that threshold.

Semaglutide, the molecule in Wegovy and Ozempic, weighs a little over 4,100 daltons. Eight times the limit. That is why these medicines are injected under the skin, and why no GLP-1 medicine is licensed as a patch. Microneedle devices are being studied in laboratories; they are research projects, not products on sale.

An ordinary adhesive patch that claims to deliver semaglutide is therefore promising something the physics of skin does not allow. The ANSM confirmed as much in its own way: there was none in there.

What is in the plant-extract patches

According to their labels, these patches contain ingredients familiar from conventional slimming supplements.

The Belgian consumer organisation Test-Achats, which reviewed them, lists berberine, pomegranate, cinnamon, chromium, B vitamins, guarana, capsaicin, ginger, bladderwrack, black pepper and green tea. None of these is GLP-1, and none is a GLP-1 medicine.

Three things are almost always missing from the packaging. First, the quantity of each ingredient: a patch a few centimetres square can only carry very little. Second, any proof that the ingredients cross the skin. Third, a single study carried out on the finished product.

Berberine deserves a word. Taken by mouth, the French food safety agency ANSES considers that it has pharmacological activity from 400mg a day and advises several groups of people against it. With a patch the question does not even arise in those terms, since nobody knows what actually gets in. Our guide to berberine covers the safety file.

Do GLP-1 patches work? Our verdict

Nothing supports the idea that a GLP-1 patch acts on appetite, on weight or on the hormone it is named after.

We looked for published clinical trials of these products. We found none. Test-Achats reaches the same conclusion and puts it bluntly: the evidence is already thin for these substances when swallowed, and thinner still when applied to the skin.

That finding does not come from a prejudice against delivery through the skin, which works very well for certain medicines. It comes from the absence of data. A manufacturer confident in its product could demonstrate it simply, by measuring the ingredients in volunteers' blood after application. To our knowledge nobody has published that.

What GLP-1 patches reviews are worth

They exist, there are plenty of them, and they do not prove much.

Someone who buys a slimming patch often changes something else the same day: they watch what they eat, walk more, weigh themselves. If they lose weight, they credit the new and visible habit. The placebo effect does the rest, all the more readily when the ritual is daily. It is precisely to cancel out those biases that research compares a product with a placebo, blind. No online review replaces that comparison.

Then there is the question of where the testimonials come from. On a seller's own site, nothing guarantees that a review was left by a genuine buyer, or that the unfavourable ones are shown. The same reservations apply to reviews of every product sold on the back of a medicine's name, as we explain in natural Ozempic: what the studies say.

What the regulators say

In the UK the clearest statement has come from the ASA. In its July 2026 ruling it considered that consumers would read the claims in the advert, set beside the name "GLP-1 Patch", as meaning the product was equivalent to, or worked like, the GLP-1 injections used for weight loss. That made them medicinal claims for a product with no medicines licence, in breach of the advertising code. The watchdog also found the advert irresponsible for a second reason: it was aimed at breastfeeding mothers, and played on insecurities about body image. The ruling followed a group of decisions in August 2025 against food supplements advertised as boosting GLP-1.

The MHRA, which regulates medicines, has not to our knowledge issued a statement about these patches in particular. Its general guidance is unambiguous: GLP-1 medicines, among them Ozempic (semaglutide), Wegovy (semaglutide), Mounjaro (tirzepatide) and Saxenda (liraglutide), are prescription-only, to be obtained from a registered pharmacy after a consultation with a healthcare professional, and never from beauty salons or sellers on social media.

In France, the ANSM has since autumn 2025 taken a series of enforcement measures against websites selling products presented as GLP-1 medicines, in the form of pens, vials or patches. It has referred cases to prosecutors, reported sites and had listings removed from major platforms. It notes that some products display its logo or that of the European Medicines Agency to look legitimate.

A product with no clear status

A plant-extract patch fits none of the categories that usually protect the buyer.

It cannot be a food supplement: the law reserves that term for foods, which are swallowed. It cannot be a medicine without a licence. What remains is an object sold as a wellness accessory, with no obligation to prove anything, and no right to any health claim.

That explains the vague wording on product pages. It also explains why it is so hard to find out who makes what, and where.

Before you buy, five minutes of checking

A few questions are enough to form a view, and most patches do not survive them.

Can the seller be identified, with a company name and a UK or European address? Does the ingredients list give quantities? Does the site cite a study, and is it a study of the patch itself or of an ingredient swallowed at a high dose? Does the page promise pounds lost, a timescale, or compare itself with a medicine? Does it display a regulator's logo? Each unfavourable answer is a reason to close the tab.

On tolerance, an adhesive worn for hours can irritate the skin, and the real ingredients of a patch of unknown origin cannot be verified. If you react, take it off and speak to a pharmacist.

If the aim is to get a better handle on appetite, the approaches with data behind them are on the plate: protein, fibre, the rhythm of meals. Our piece on natural GLP-1 sets them out, and the guide to GLP-1 supplements explains how to read a formula, whatever its format. And if the question is about treatment for obesity, it belongs in a consultation with a clinician. For the hormone itself, start with what is GLP-1.

Frequently asked questions

Do GLP-1 patches work?

Nothing shows that they do. No published study examines these patches, and nothing establishes that their ingredients cross the skin in useful amounts.

Do GLP-1 patches contain semaglutide?

No. The patches tested for the French regulator contained no GLP-1 medicine, and the seller in the ASA case said its own contained none. Semaglutide is too large a molecule to pass through skin from a simple adhesive, and it is supplied only on prescription.

What is in a GLP-1 patch?

According to the ingredient lists compiled by Test-Achats: berberine, guarana, green tea, cinnamon, ginger, chromium and B vitamins, among others. Quantities are rarely given.

Are GLP-1 patches a scam?

Those claiming to contain a medicine have been described as fraudulent by the French medicines agency. The others sell the name of a hormone for plant extracts whose effect through the skin has never been demonstrated.

Are GLP-1 patches safe?

For patches of unknown origin, the ANSM stresses that they could contain harmful substances. For the others, the most predictable risk is skin irritation. The other danger is putting off proper care.

Is it legal to sell GLP-1 patches in the UK?

A herbal patch can be sold, but it may not be advertised with medicinal claims or with any implied comparison to a prescription medicine, as the ASA ruled in 2026. A product sold as containing a real GLP-1 medicine outside a registered pharmacy is illegal.

Is there a real GLP-1 medicine in patch form?

Not at present. Licensed GLP-1 medicines are given by injection under the skin or, for some forms of semaglutide, as a tablet.

This article is for information only and is no substitute for advice from a healthcare professional. Never change your treatment without talking to your doctor.