How is MK-677 supplied?

MK-677 is supplied as a lyophilised (freeze-dried) powder in 25 mg vials, for laboratory research use only.

Has this batch of MK-677 been independently tested?

Yes. Lot PX-2414-A was tested at 99.5% by an independent laboratory. The full certificate of analysis is published and searchable by lot code on the verify page, before and after purchase.

Is MK-677 for human use?

No. MK-677 is supplied strictly for in vitro laboratory research. It is not for human or animal consumption, and is not a drug, food, or cosmetic.

MK-677

Name: MK-677
Brand: PepNex
Availability: InStock

Ibutamoren · GHS. Supplied in 25 mg vials, lyophilised and ready to reconstitute.

Batch certified

UK stock, same-day

Stored cold, shipped & sealed safely

Strength

How many vials?

2 more vials to save 5%

Add bacteriostatic water

Peptides ship as dry powder — you’ll need this to reconstitute the vial.

£55.01 from free UK delivery

Total£44.99

Ships today

Questions about MK-677? Ask us

For laboratory research use only. Not for human or animal consumption, and not a drug, food, or cosmetic. Sold to qualified researchers and institutions.

About MK-677

Molecular weight: 528.7 g/mol
CAS number: 159634-47-6

MK-677 (ibutamoren) is a non-peptide, orally active small molecule built on a spiroindoline-piperidine scaffold that acts as an agonist of the growth hormone secretagogue receptor (GHS-R1a, the ghrelin receptor). It is used as a research tool compound for studies of ghrelin-receptor signalling.

For laboratory research use only. Not for human or veterinary use.

Specifications

Identity

Sequence: not recorded
Molecular formula: C27H36N4O5S
Molecular weight: 528.7 g/mol
CAS number: 159634-47-6

Physical

Form: Lyophilised powder
Appearance: White to off-white powder
Solubility: Soluble in bacteriostatic or sterile water
Storage: Store the lyophilised powder at -20°C, protected from light. Refrigerate reconstituted material at 2 to 8°C and use within its stability window.

This batch

Purity: 99.5%
Lot: PX-2414-A
Test date: May 2026
Testing lab: third-party
Methods: HPLC, LC-MS/MS

Certificate

Certificate · lot PX-2414-A99.5% · HPLC / LC-MS/MS · May 2026

COA · PX-2414-A.pdfIndependent lab report

Handling and storage

Reconstitute with bacteriostatic or sterile water. Store the lyophilised powder at -20°C, protected from light; refrigerate reconstituted material at 2 to 8°C. Handle under standard laboratory conditions.

Literature

Design and biological activities of L-163,191 (MK-0677), a potent, orally active growth hormone secretagogue
Patchett AA, et al. · PNAS · 1995

Common questions about MK-677

What is MK-677?: MK-677 (ibutamoren) is a non-peptide, orally active small molecule built on a spiroindoline-piperidine scaffold that acts as an agonist of the growth hormone secretagogue receptor (GHS-R1a, the ghrelin receptor).
How is MK-677 supplied?: MK-677 is supplied as a lyophilised (freeze-dried) powder in 25 mg vials, for laboratory research use only.
How should MK-677 be stored and handled?: Reconstitute with bacteriostatic or sterile water. Store the lyophilised powder at -20°C, protected from light; refrigerate reconstituted material at 2 to 8°C. Handle under standard laboratory conditions.
Has this batch of MK-677 been independently tested?: Yes. Lot PX-2414-A was tested at 99.5% by an independent laboratory. The full certificate of analysis is published and searchable by lot code on the verify page, before and after purchase.
Is MK-677 for human use?: No. MK-677 is supplied strictly for in vitro laboratory research. It is not for human or animal consumption, and is not a drug, food, or cosmetic.