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7.8/ 10PepFinder Score
| Listing as named | Size | Price | Per mg | Stock | |
|---|---|---|---|---|---|
| YK11 | As listed | £44.99 | — | In stock | On their site ↗ |
Prices as last checked on their site. The supplier confirms the final price and availability.
Market data · 5 suppliers · United Kingdom
Buy YK-11 UK : 5 suppliers prices compared
5 of the suppliers we track list YK-11 in or shipping to the UK. They are ranked by PepFinder Score, which combines reliability, selection, pricing, delivery, support and customer reviews, and shown with the prices they list per mg. Stores based in the UK come before those shipping in from abroad, whatever their score. We don't sell YK-11, and we give no guidance on its use. Only prices listed in GBP are shown here; stores that price in other currencies are on All regions.Also known as YK11, YK 11. Stores list it under any of these names, and all of them are matched here.
Prices checked 25 Sept 2026 · 7 listings · 5 in stock · Other compounds sold by peptide stores
No priced listings with a stated quantity yet.
Each currency is shown separately; prices are never converted.
Regulatory status
YK-11 has never been approved as a medicine anywhere and is prohibited in sport by the World Anti-Doping Agency. Material sold as a 'research' product is not an approved medicine.
In United Kingdom the regulator is the Medicines and Healthcare products Regulatory Agency (MHRA). Rules on buying, importing and using this product differ by country. Suppliers list it for laboratory research; nothing here is medical advice.
Showing 5 of 5 suppliers · prices in GBP only, never converted
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7.1/ 10PepFinder ScoreListing as named Size Price Per mg Stock YK-11 As listed £54.99 — In stock On their site ↗ Prices as last checked on their site. The supplier confirms the final price and availability.
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Steroids UK
GB basedThird-party testing stated55 products tracked · Ships to 36 countries
Pays byCardBank transferCrypto5.5/ 10PepFinder ScoreFrom £4.98/mg (5mg)
Listing as named Size Price Per mg Stock YK11 Pharmaqo Labs 60caps/5mg 5mg £24.90 £4.98/mg In stock On their site ↗ YK11 [10mg/100caps] | Syncom Labs 10mg £69.90 £6.99/mg Out of stock On their site ↗ YK11 | 60 caps / 10mg 10mg £55.90 — Out of stock On their site ↗ Prices as last checked on their site. The supplier confirms the final price and availability.
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4.5/ 10PepFinder ScoreListing as named Size Price Per mg Stock YK-11 As listed £54.97 — In stock On their site ↗ Prices as last checked on their site. The supplier confirms the final price and availability.
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–PepFinder ScoreFrom £0.01/mg (2g)
Listing as named Size Price Per mg Stock YK-11 Powder 2g – Myostine-Based Compound for Controlled Laboratory Research 2g £25.00 £0.01/mg In stock On their site ↗ Prices as last checked on their site. The supplier confirms the final price and availability.
Told when YK-11 gets cheaper in the UK
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At a glance · 25 Sept 2026
- Suppliers serving the UK
- 5 list YK-11, 5 listings in stock
- Price per mg
- No priced listings with a stated quantity yet
- Test certificates
- Not yet collected by PepFinder for YK-11; check each supplier's site. How to read a COA
- Legal status in the UK
- Most research peptides are not controlled drugs in the UK, but selling or supplying an unlicensed medicine is an offence under the Human Medicines Regulations 2012; growth hormone and HCG are Class C controlled drugs. Full summary with sources
What YK-11 is
YK-11 is a synthetic steroid derivative, first described by researchers at Toho University in Japan, that acts as a partial agonist of the androgen receptor and raised follistatin expression in cultured mouse muscle cells. It is sold as a SARM, but structurally it is a steroid, and its entire evidence base is three cell-culture papers: there are no human trials and no animal efficacy trials. It has never been approved as a medicine anywhere, the FDA has warned consumers about SARM products, and WADA prohibits SARMs in sport at all times. Read the full YK-11 guide, with the published research and references.
YK-11 market over time
The median listed price per mg across every tracked supplier listing YK-11 in each currency, recorded daily from validated listings only. Days with too few listings to publish are left out, not estimated. How we validate prices
Catalogue changes, last 30 days
43 listings added · 0 withdrawn
- 25 Sept 2026Vital Core Researcher AccessNew listing: YK-11
- 25 Sept 2026UK Peptide StoreNew listing: YK-11
- 25 Sept 2026Steroids UKNew listing: YK11 [10mg/100caps] | Syncom Labs (10mg)
- 25 Sept 2026Steroids UKNew listing: YK11 | 60 caps / 10mg (10mg)
- 25 Sept 2026Steroids UKNew listing: YK11 Pharmaqo Labs 60caps/5mg (5mg)
- 25 Sept 2026Sports Technology LabsNew listing: LGD-4033 and YK-11 Stack | Buy SARMs Stack Online
- 25 Sept 2026Sports Technology LabsNew listing: YK-11 SARM Research Powder | Laboratory Grade
- 25 Sept 2026Saxon LabsNew listing: YK-11 Powder 2g – Myostine-Based Compound for Controlled Laboratory Research (2g)
- 25 Sept 2026Receptor ChemNew listing: YK11
- 25 Sept 2026RCpeptidesNew listing: YK-11 100x10mg (10mg)
Before you choose a YK-11 supplier
Price per mg is only half the comparison. Check that the supplier publishes a certificate of analysis for the batch it is selling, ideally from an independent laboratory, and that the certificate confirms identity as well as purity: our guide on how to read a COA shows what to look for. A price far below the rest of the list is more often a warning than a bargain; peptide prices explained sets out why.
For what YK-11 is and what published studies have found, see our YK-11 guide. Handling questions are covered in how to store peptides, and the peptide calculator converts a vial size and water volume into concentration and syringe units. Rules on buying and importing differ by country: read are peptides legal in the UK? and see all suppliers serving the UK.
Checking a YK-11 certificate of analysis
- The certificate names a laboratory you can find independently, and ideally one with no stake in the result.
- It carries a batch or lot number that matches the product page or the vial label, and a test date.
- It confirms identity by mass spectrometry, not only purity by HPLC. Purity alone does not show the vial contains YK-11.
- It includes the chromatogram and mass spectrum, not just a summary table.
- Where the laboratory offers online verification of its reports, the report number checks out.
Red flags
- No certificates at all, or certificates available only “on request”.
- The same certificate used for several products or several years of stock.
- Payment only by cryptocurrency or bank transfer, with a discount for paying that way.
- A price far below every other supplier on this page.
- No company name, address or way to contact the business other than a web form.
- Vials labelled only with a code rather than the product name and strength.
How to spot a fake peptide supplier explains each of these in more detail, and third-party peptide testing covers what independent results can and cannot prove.
Vials, capsules and pre-mixed products
Most research peptides are sold as freeze-dried (lyophilised) powder in sealed vials, which is mixed with a diluent such as bacteriostatic water before use in the lab. Some suppliers also sell pre-mixed solutions, nasal sprays or capsules under the same name. These are different products with different stability and dosing, so compare price per mg only between the same form, and check which form a listing is before comparing it with the rest of the table.
YK-11 in the UK: questions
Where can I buy YK-11 in the UK?
5 of the suppliers PepFinder tracks list YK-11 and are based in or ship to the UK. The highest rated are Receptor Chem, MuscleChem, Steroids UK. The list on this page is ranked by PepFinder Score, which weighs reliability, delivery, pricing, support and customer reviews, with stores based in the UK placed before those shipping in from abroad; nobody pays to be included or to rank higher.
What sizes is YK-11 sold in?
Suppliers on this page list YK-11 in 5mg, 10mg, 2g. Most research peptides are sold as freeze-dried powder in sealed vials; capsules, sprays and pre-mixed solutions are different products, so compare price per mg only between the same form.
Is it legal to buy YK-11 in the UK?
Most research peptides are not controlled drugs in the UK, but selling or supplying an unlicensed medicine is an offence under the Human Medicines Regulations 2012; growth hormone and HCG are Class C controlled drugs. Our page on whether peptides are legal in the UK sets out the rules with a link to every source. This is general information, not legal advice.
Can YK-11 be shipped to the UK?
Non-controlled medicines can be imported for your own use without an import licence, but Border Force can seize quantities above reasonable personal use, and controlled drugs such as growth hormone and HCG cannot be posted to you from overseas. Each supplier on this page shows where it is based, so you can see whether an order would cross a border.
How do I check a YK-11 supplier's test results?
Ask for a certificate of analysis for the batch being sold, and check that it names the laboratory, the batch number and the test date, and that it confirms identity by mass spectrometry as well as purity by HPLC. PepFinder has not yet collected certificates for YK-11 from these suppliers, so check each supplier's own site.
How this list is built: suppliers appear because they list YK-11 on their own website, read by our catalogue checks; nobody pays to be included or to move up. Ranking is by PepFinder Score. Prices, sizes and stock are as each site listed them when checked and may have changed. Provisional scores are based on incomplete research.