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Peptides Explained

United Kingdom

Peptides and UK law: what the Human Medicines Regulations say

In short

About 8 minutes for the short version; 9 with every detail open.

  • In the UK, a peptide sold to heal, slim or build muscle is likely a medicinal product.
  • Selling or supplying one with no licence is a crime. The maximum is two years in prison.
  • Importing a medicine just for yourself needs no import licence. Selling it on is still a crime.
  • None of the peptides on this site is a controlled drug under the Misuse of Drugs Act.
  • Anyone can report a side effect to the Yellow Card scheme.
Last reviewed
A long gothic palace with towers and a clock tower, lit up at dusk and reflected in a river.
The Palace of Westminster in London. The UK Parliament meets here. Photo: Diliff (Wikimedia Commons) CC BY-SA 2.5 Image details

Each section starts with the short answer. The rest is folded under “In detail”.

What does UK law say about peptides?

Most peptides sold online likely count as medicines with no licence. Selling or supplying them is a crime.
Selling a medicine with no UK licence is a crime. Importing one for yourself needs no import licence. Human Medicines Regulations 2012 and Misuse of Drugs Act 1971, as published on legislation.gov.uk on 22 October 2026.
Under UK law
Is selling it, supplying it or offering it forbidden?Yes A medicinal product with no UK licence may not be sold, supplied or offered.1
Is keeping it to sell or pass on forbidden?Yes If you know, or have reason to believe, it will be sold or supplied to someone else.1
Is advertising it forbidden?Yes Only medicines with a UK licence or registration may be advertised.2
Does importing it only for your own use need a licence?No The import licence rule does not apply to a medicine for yourself or your household.3
Is it a controlled drug?No No peptide on this site is listed under the Misuse of Drugs Act.4

The Human Medicines Regulations 2012 are the main UK law on medicines. This page explains what they say about products such as BPC-157, TB-500 or retatrutide. It does not tell you how to get round the law. The licence that counts is a UK licence.1

What counts as a medicine

Is a peptide a medicinal product under UK law?

Often, yes. The law looks at how it is offered and at what it does in the body.
UK law has two tests. A product that meets either one is a medicinal product.
TestThe question the law asks
PresentationIs the substance presented as preventing or treating disease in people?
FunctionCan it be used in people to restore, correct or change a body function, through a drug-like effect? Or to make a diagnosis?

These are the words of regulation 2.5 They are the same two tests as in EU law.6 See research use only for why a “research” label does not change what a product is.

The core rule: no licence, no sale

What exactly does the law forbid?

Selling, giving or offering a medicine with no UK licence. Keeping it to pass on is banned too.
What the law forbids for a medicine with no UK licence.
  1. No sale or supply. Nobody may sell or supply it, or offer to.1
  2. No stock for others. Nobody may have it if they know, or have reason to believe, it will be sold or supplied to someone else.1
  3. No making it for that. Nobody may make it, or arrange its sale, supply or making, if they know it is meant to be sold against the rule.1
  4. The penalty. On conviction on indictment, the more serious kind of trial, up to two years in prison, a fine, or both.7

The MHRA, the UK medicines regulator, applies this to peptides sold online. It says retatrutide has not been authorised in the UK, so “anyone selling this product is doing so illegally”.8

In detail Prescription-only medicines, and passing on to friends

A prescription-only medicine may only be sold or supplied on a prescription from a doctor or another listed prescriber.9 Having one with the intent to supply it without a prescription is an offence. So is breaking the prescription rule. Each carries up to two years in prison on conviction on indictment.10

The law treats supply very differently from use. The ban covers selling and supplying, and arranging a sale or supply for someone else.1 In our reading, passing a product on to a friend, selling some on, or ordering for a group can all count as supply.

Importing for your own use

Can I import a peptide for my own use?

You need no import licence for a medicine just for you. Selling it on is still a crime.
How the import rules work when you buy a medicine for yourself.
  1. The usual rule. Importing a medicine into Great Britain from most countries needs a manufacturer’s licence.3
  2. The personal exception. That rule does not apply to someone who imports a medicine to use on themselves or someone in their household.3
  3. The seller is not covered. Selling or supplying an unlicensed medicinal product in the UK is still an offence.1
  4. Nobody has checked it. An unauthorised medicine has not been assessed by the MHRA for safety, effectiveness or quality.11

If your product did not come from a pharmacy, no regulator has checked what is in it. See product risk for what you can and cannot check yourself.

Is there a legal way to get an unlicensed medicine in the UK?

Yes, but only in a narrow way. A doctor can order a “special” for one patient’s needs.
When a doctor may order a 'special': a medicine with no licence, made for one patient.
  1. A prescriber asks for it. The order comes from a doctor or another listed prescriber, unprompted by the maker.12
  2. For one patient’s needs. It is for a patient in their direct care. The MHRA says the needs must be clinical, and the prescriber decides them.12,13
  3. No licensed medicine fits. Specials are for when no licensed medicine can meet the patient’s needs.13
  4. No advertising. Nobody may advertise the product.12
  5. Made or imported under licence. A licensed maker or importer supplies it. Importers must tell the MHRA before they import.12,13

The MHRA notes that unlicensed medicines may not have been assessed by it.13 For a peptide with no published human trials, a prescriber would have to judge that a clinical need exists. That is our reading, not an MHRA statement. See legal routes and talking to your doctor.

Controlled drugs

Are any of these peptides controlled drugs in the UK?

No. Growth hormone and a few other hormones are Class C drugs. No peptide on this site is.
Which hormones the drugs law lists as Class C, and where our peptides stand.
GroupUnder the Misuse of Drugs Act 1971
Somatropin, somatrem and somatotropin (growth hormone), chorionic gonadotrophin (HCG), non-human chorionic gonadotrophin, clenbuterol, zeranol, zilpaterolClass C controlled drugs4
BPC-157, TB-500, KPV, CJC-1295, ipamorelin, tesamorelin, hexarelin, AOD-9604, melanotan II, PT-141, MOTS-c, epitalon, Semax, Selank, thymosin alpha-1, GHK-Cu, SS-31, semaglutide, tirzepatide, retatrutideNot listed (we searched the schedule for each name on 22 October 2026)4

So the drugs law does not apply to these peptides. The medicines law on this page does.

Advertising

Can anyone advertise these products in the UK?

No. Only a medicine with a UK licence may be put in an advert.

The MHRA acted on more than 1,500 websites and accounts in 2025

1,500+

web shops and social media accounts that sold medicines against the law. The MHRA acted in 2025.

What was counted MHRA Criminal Enforcement Unit, working with internet service providers, January to December 2025; all medical products, not peptides only Source MHRA seizes illegal medicines worth almost £45m in 2025 – disrupting major criminal networks11

Nobody may publish an advertisement for a medicinal product unless a UK licence or registration is in force for it.2 The MHRA warned in July 2026 that prescription weight-loss medicines are being advertised illegally on social media.8 This site sells nothing and names no seller.

How the MHRA enforces the law

Does the MHRA act against sellers?

Yes. In 2025 and 2026 it raided sites that made unlicensed weight-loss injections.

Over 12,000 fake weight-loss pens were seized in one raid

12,000+

fake weight-loss pens found in one raid in Birmingham, 14 October 2026

What was counted One MHRA and West Midlands Police operation; packaging for about 30,000 more products was also found Source Counterfeit weight loss pens worth £2 million seized by MHRA and West Midlands Police14

In 2025, the MHRA and police seized almost 20 million doses of medicines sold against the law.

almost 20 million

doses seized in 2025. They include 5,680 GLP-1 pens.

What was counted All illegally traded medicines seized by the MHRA and its partners in 2025, up from 17 million in 2024 Source MHRA seizes illegal medicines worth almost £45m in 2025 – disrupting major criminal networks11

The MHRA has its own criminal enforcement unit. In 2026 it took apart sites that made or packed unlicensed retatrutide and tirzepatide. One of them was also believed to make “peptide products”.15,14

In detail The 2025 and 2026 operations, and what the MHRA says about the products
  • October 2025: the first illicit weight-loss medicine factory found in the UK; 5,000 unauthorised retatrutide and tirzepatide pens seized.14
  • February 2026: about 2,000 doses awaiting dispatch seized, with equipment and suspected ingredients.14
  • May 2026: two men arrested on suspicion of offences under the Human Medicines Regulations; about 12,000 doses recovered.15
  • October 2026: over 12,000 fake retatrutide and tirzepatide pens seized from a warehouse in Birmingham.14

The MHRA says these products “have not been assessed for safety, quality or effectiveness”. There is “no guarantee of what they contain”. It also says products sold as retatrutide outside clinical trials are supplied illegally.14

For GLP-1 medicines, the MHRA says licensed products come as pre-filled pens or tablets. Products sold as a powder in a vial, to be mixed before injection, are not authorised.16

Sport

What if I compete in the UK?

UK Anti-Doping uses the world rules. You answer for anything found in your body.

UK Anti-Doping (UKAD) explains strict liability like this: you are “solely responsible for any banned substance” in your system, “regardless of how it got there”.17 Many peptides are banned at all times. UKAD says not every banned experimental peptide is named on the list.18 See sport and doping.

Where to report

Where can I report a side effect in the UK?

To the Yellow Card scheme, run by the MHRA. Anyone can report.

Side effects. Anyone can report a problem with a medicine to the Yellow Card scheme. The MHRA cannot give medical advice. If you are worried about your health, speak to a doctor or pharmacist, or call NHS 111.19 In its October 2026 warning about fake pens, the MHRA asked anyone who suspects a side effect to report it.14

Before you report. Keep the product, its label and any papers. Write down the batch number. Tell your doctor what you use: see talking to your doctor.

Sources

Every claim on this page links to one of these sources. Scholarly sources link to their DOI; regulatory sources to the regulator's own page.

In detail All 19 sources, numbered as in the text
  1. UK Parliament (2012). The Human Medicines Regulations 2012 (SI 2012/1916), regulation 46: Requirement for authorisation. legislation.gov.uk. Law legislation.gov.uk — accessed 20 October 2026 ↩
  2. UK Parliament (2012). The Human Medicines Regulations 2012 (SI 2012/1916), regulation 279: Requirement for authorisation (advertising). legislation.gov.uk. Law legislation.gov.uk — accessed 22 October 2026 ↩
  3. UK Parliament (2012). The Human Medicines Regulations 2012 (SI 2012/1916), regulation 17: Manufacturing of medicinal products. legislation.gov.uk. Law legislation.gov.uk — accessed 22 October 2026 ↩
  4. UK Parliament (1971). Misuse of Drugs Act 1971, Schedule 2 (Controlled drugs), Part III: Class C drugs. legislation.gov.uk. Law legislation.gov.uk — accessed 22 October 2026 ↩
  5. UK Parliament (2012). The Human Medicines Regulations 2012 (SI 2012/1916), regulation 2: Medicinal products. legislation.gov.uk. Law legislation.gov.uk — accessed 22 October 2026 ↩
  6. European Parliament and Council of the European Union (2001). Directive 2001/83/EC on the Community code relating to medicinal products for human use (consolidated text). Official Journal of the European Communities, L 311. Law eur-lex.europa.eu — accessed 20 October 2026 ↩
  7. UK Parliament (2012). The Human Medicines Regulations 2012 (SI 2012/1916), regulation 47: Offences in connection with authorisation. legislation.gov.uk. Law legislation.gov.uk — accessed 22 October 2026 ↩
  8. Medicines and Healthcare products Regulatory Agency (2026). No summer shortcut for safe weight loss. GOV.UK. Regulator gov.uk — accessed 22 October 2026 ↩
  9. UK Parliament (2012). The Human Medicines Regulations 2012 (SI 2012/1916), regulation 214: Sale or supply of prescription only medicines. legislation.gov.uk. Law legislation.gov.uk — accessed 22 October 2026 ↩
  10. UK Parliament (2012). The Human Medicines Regulations 2012 (SI 2012/1916), regulation 255: Offences under Part 12. legislation.gov.uk. Law legislation.gov.uk — accessed 22 October 2026 ↩
  11. Medicines and Healthcare products Regulatory Agency (2026). MHRA seizes illegal medicines worth almost £45m in 2025 – disrupting major criminal networks. GOV.UK. Regulator gov.uk — accessed 22 October 2026 ↩
  12. UK Parliament (2012). The Human Medicines Regulations 2012 (SI 2012/1916), regulation 167: Supply to fulfil special patient needs. legislation.gov.uk. Law legislation.gov.uk — accessed 22 October 2026 ↩
  13. Medicines and Healthcare products Regulatory Agency (2025). Supply unlicensed medicinal products (specials). GOV.UK. Regulator gov.uk — accessed 22 October 2026 ↩
  14. Medicines and Healthcare products Regulatory Agency (2026). Counterfeit weight loss pens worth £2 million seized by MHRA and West Midlands Police. GOV.UK. Regulator gov.uk — accessed 22 October 2026 ↩
  15. Medicines and Healthcare products Regulatory Agency (2026). Two arrested during the MHRA's largest ever seizure of unlicensed weight loss medicines. GOV.UK. Regulator gov.uk — accessed 22 October 2026 ↩
  16. Medicines and Healthcare products Regulatory Agency (2026). GLP-1 medicines for weight loss and diabetes: what you need to know. GOV.UK. Regulator gov.uk — accessed 20 October 2026 ↩
  17. UK Anti-Doping (2026). Athletes – Rights and Responsibilities. Web page ukad.org.uk — accessed 22 October 2026 ↩
  18. UK Anti-Doping (2026). 2027 Prohibited List: Summary of Changes. Web page ukad.org.uk — accessed 22 October 2026 ↩
  19. Medicines and Healthcare products Regulatory Agency (2026). Yellow Card: making medicines and medical devices safer. Web page yellowcard.mhra.gov.uk — accessed 22 October 2026 ↩