Where to buy MK-677 (ibutamoren, LUM-201) in the UK: the sellers with a verifiable COA
No verified UK seller has published a MK-677 certificate we have read yet.
Who holds the newest MK-677 report
None yet. No seller on the verified list has published a report on Janoshik's own website that names the seller as the client and covers MK-677. Any of the 39 verified sellers is where testing can be checked; see the full list.
A record of paperwork, not a recommendation: The Peptide Watch sells nothing, takes no money from sellers and links to none of them.
Why the date matters · What purity means · What MK-677 is · Regulators
Why the date on a certificate matters
What a purity figure means
The purity on a Janoshik report is the share of the main peak in an HPLC chromatogram. 99.5% means that 99.5% of what the detector saw was one substance and 0.5% was something else. It is not the amount in the vial: that is the separate quantity line, in milligrams. It does not by itself prove which substance the peak is: that is identity, confirmed by mass spectrometry. And it says nothing about sterility, endotoxins or heavy metals, which are separate tests.
A purity figure printed on a shop page with no report behind it is a claim, not a measurement. Between two reports, the difference that matters is rarely 99.2% against 99.8%; it is whether the report exists at all, names the seller as the client, covers this compound on its own, and is recent.
What MK-677 is, and what it is sold as
MK-677 (ibutamoren) is an oral ghrelin-receptor agonist designed at Merck in 1995 and abandoned after trials in older adults; it was revived as LUM-201 for children with growth hormone deficiency and entered phase 3 in 2026. Not a peptide, not approved anywhere, and prohibited by name in sport.
| Development status | Phase 3. Phase 3 in paediatric growth hormone deficiency began recruiting in May 2026 (NCT06948214). Never approved anywhere. |
|---|---|
| Originator | Arthur Patchett and colleagues, Merck Research Laboratories, 1995 (L-163,191). Rights: Merck's compound, later licensed to Lumos Pharma as LUM-201; Lumos was acquired by Double Point Ventures in 2024. Orphan designation in the US and EU for paediatric growth hormone deficiency. |
| Registered clinical trials | 14 on ClinicalTrials.gov |
A Merck drug from 1995, finally in phase 3, for children. Ibutamoren (MK-0677) was designed at Merck Research Laboratories as an oral molecule that mimics ghrelin and so raises growth hormone and IGF-1. Merck ran trials through the late 1990s and 2000s in older adults, hip-fracture recovery and Alzheimer's disease, where it had no effect on progression (Neurology, 2008), and dropped it. Lumos Pharma revived it as LUM-201 for children with growth hormone deficiency: two phase 2 trials reported growth in line with injected growth hormone in 2024, and a placebo-controlled phase 3 (NCT06948214) began recruiting in May 2026 under Double Point Ventures, which bought Lumos in 2024. PubMed indexes 120 papers and 19 clinical-trial reports; ClinicalTrials.gov lists 14 registered studies.
Not a peptide, not approved, and prohibited in sport. No regulator has approved MK-677 for any use. The 2026 WADA Prohibited List names ibutamoren (MK-677) as banned at all times, and the US military's supplement safety programme lists it as an unapproved drug that cannot lawfully be sold as a supplement. The paediatric programme uses a screened population and a low dose; nothing in it speaks to the adult use it is sold for.
What a certificate can tell you. The only report we hold for MK-677 is a heavy-metals screen from Thoroughbred Labs in May 2026 (arsenic, cadmium and lead not detected). No seller we track has published a purity assay for it.
The published record in numbers, and the sources
| Papers on PubMed | 120 |
|---|---|
| Indexed as rat or mouse studies | 33 |
| Indexed as clinical trials | 19 |
| Published since 2020 | 30 |
Counts are from PubMed on 15 September 2026 using the queries recorded in our evidence file. A description of the published record, not medical advice and not an argument for or against use.
- Design and biological activities of L-163,191 (MK-0677): a potent, orally active growth hormone secretagogue. (Proc Natl Acad Sci U S A, 1995, PMID 7624358)
- MK-677, an orally active growth hormone secretagogue, reverses diet-induced catabolism. (J Clin Endocrinol Metab, 1998, PMID 9467534)
- Growth hormone secretagogue MK-677: no clinical effect on AD progression in a randomized trial. (Neurology, 2008, PMID 19015485)
- MK-0677 (ibutamoren mesylate) for the treatment of patients recovering from hip fracture: a multicenter, randomized, placebo-controlled phase IIb study. (Arch Gerontol Geriatr, 2011, PMID 21067829)
- Treatment of Pediatric Growth Hormone Deficiency With Oral Secretagogues Revisited. (J Endocr Soc, 2021, PMID 34141995)
- The Safety and Efficacy of Growth Hormone Secretagogues. (Sex Med Rev, 2018, PMID 28400207)
- ClinicalTrials.gov NCT06948214, phase 3 study of LUM-201
- Lumos Pharma, topline phase 2 data for LUM-201
- Operation Supplement Safety, MK-677 (ibutamoren)
- WADA, 2026 Prohibited List (S2: peptide hormones, growth factors, related substances and mimetics)
- electronic medicines compendium, UK product search for ibutamoren
What regulators say about MK-677
In the UK. Not a licensed medicine; the emc lists no ibutamoren product. Sold as a research chemical. Prohibited in sport.
We hold no statement from the FDA, MHRA or EMA specifically about MK-677 on file. Its development and licence sources are listed under the record above.
Questions people ask
Which UK sellers publish a verifiable Janoshik certificate naming MK-677?
As of 30 October 2026, none that we have read. No seller on our verified list has published a report on Janoshik's own website that names the seller as the client and lists MK-677.
How do I check that a certificate for MK-677 is genuine?
Four things: an independent laboratory is named; the client field names the seller you are buying from, not a supplier; the compound line says MK-677; and the report's task number and key open the same report on the laboratory's own website (verify.janoshik.com). A branded PDF with no laboratory name and no verification code fails on the first check, however professional it looks. The free COA Checker on this site runs the checks for you.
Is MK-677 a licensed medicine in the UK?
Not a licensed medicine; the emc lists no ibutamoren product. Sold as a research chemical. Prohibited in sport. Phase 3 in paediatric growth hormone deficiency began recruiting in May 2026 (NCT06948214). Never approved anywhere. The Peptide Watch does not give legal or medical advice.
Why does The Peptide Watch not say where to buy MK-677?
Because the site records paperwork, not recommendations. A verifiable certificate proves that a sample of one batch was tested. It does not prove the vial you receive matches it, and it says nothing about whether anyone should use MK-677. Listing which sellers publish a certificate you can check, and which publish nothing, is as far as the evidence goes.
The Peptide Watch's position on MK-677
Not a licensed medicine; the emc lists no ibutamoren product. Sold as a research chemical. Prohibited in sport. The Peptide Watch reads the certificates UK sellers publish and does not recommend anywhere to buy MK-677. Sellers on this page are listed by the date of their newest MK-677 certificate and by nothing else. If you can verify a seller's testing, you can at least judge its evidence; if you cannot, you are taking the seller's word for what is in the vial. See how UK testing compares across every seller in the market statistics.
An honest note: a verifiable certificate proves a sample of a batch was tested, not that the specific vial you receive matches it, see what this can and can't tell you. The Peptide Watch sells no MK-677 and links to no shop; this is research-use-only information, not medical or dosing advice.
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