$99.00 $49.50 50% off with code LAUNCH50

For laboratory research use only. Not for human or animal use. Not for diagnostic, therapeutic, or cosmetic purposes. Supplied with a lot-specific certificate of analysis.

For laboratory research use only. Not for human or animal use. Supplied with a lot-specific certificate of analysis.

Additional information

CAS Number

159752-10-0

Molecular Formula

C27H36N4O5S

Molecular Weight

528.7 g/mol

Form

Capsules

Quantity

10 mg × 60 capsules

MK-677 (ibutamoren, L-163,191) is a non-peptide spiroindoline small molecule that acts as an agonist at the growth hormone secretagogue receptor (GHS-R1a, the ghrelin receptor). It is supplied here as 60 capsules of 10 mg for laboratories that need a pre-weighed solid format.

The compound was described by Merck investigators in a 1995 paper on the design and pharmacology of L-163,191, which reported growth hormone release from cultured rat pituitary cells with nanomolar potency. The receptor it targets was cloned the following year and described in Science. MK-677 is used as a reference agonist in GHS-R1a binding and signaling assays and in pituitary cell culture models.

Supplied as capsules, 10 mg × 60. Store tightly closed in the original bottle at controlled room temperature, in a dry place protected from light and moisture.

Peer-reviewed background for our compounds is collected in the Research Library. Every tested lot’s HPLC purity result is filed on the Certificates of Analysis page, and our Testing and Quality page explains what those certificates do and do not show.

For laboratory research use only. Not for human or animal use. Not for diagnostic, therapeutic, or cosmetic purposes. Each lot ships with a certificate of analysis; match the lot number on the bottle to the certificate before the material enters an assay.

Certificate of Analysis

Every lot Liv Pure ships is tested by an independent laboratory before release. The certificate of analysis reports chromatographic purity (HPLC) for that specific lot, and the current certificates for this compound are linked at the end of the description above, and every lot Liv Pure ships is listed on the Certificates of Analysis page. Match the lot number printed on the vial to the certificate before the material enters an assay. If a lot you hold is not listed, request its certificate from support@livpurewellness.com.

Liv Pure

Liv Pure supplies research-grade synthetic peptides and laboratory reagents to qualified researchers and institutions. Every lot ships with a lot-specific certificate of analysis.

Research Use Only • Lot-Specific COAs • Ships From the USA

© 2026 Liv Pure. All rights reserved.

All products provided by Liv Pure are intended solely for in-vitro laboratory research purposes. These materials are expressly forbidden for any form of human or animal use, ingestion, or administration, and all products are sold strictly for research, laboratory, or analytical purposes, not for human consumption. The products offered on this site are not formulated, designed, or intended to diagnose, cure, mitigate, treat, or prevent any disease or medical condition, and these statements have not been evaluated by the Food and Drug Administration. Liv Pure is a chemical supplier; it is not a compounding pharmacy or chemical compounding facility as defined under Section 503A of the Federal Food, Drug, and Cosmetic Act, nor an outsourcing facility as defined under Section 503B of the Act.