MK-677 (Ibutamoren) is an orally active, non-peptidic ghrelin receptor agonist that selectively stimulates endogenous growth hormone and IGF-1 release in preclinical models. PX1 Research supplies reference-grade MK-677 for laboratory investigation, backed by USA manufacturing, lot-specific third-party HPLC/MS and endotoxin COAs, and same-day dispatch (M–F) from fulfillment hubs in California and Arizona.
MK-677 (Ibutamoren) is an orally active, non-peptidic ghrelin receptor agonist that selectively stimulates endogenous growth hormone and IGF-1 release in preclinical models. PX1 Research supplies reference-grade MK-677 for laboratory investigation, backed by USA manufacturing, lot-specific third-party HPLC/MS and endotoxin COAs, and same-day dispatch (M–F) from fulfillment hubs in California and Arizona.
MK-677, also known chemically as Ibutamoren mesylate, is a potent, non-peptidic growth hormone secretagogue (GHS) that selectively targets the ghrelin receptor (GHSR1a). In animal models and cell culture assays, it mimics the action of endogenous ghrelin to amplify pulsatile Growth Hormone (GH) release without disrupting base cortisol or prolactin secretion.
Unlike short-acting peptide secretagogues that require parenteral administration, MK-677 exhibits prolonged systemic exposure, resulting in sustained elevations of circulating Insulin-like Growth Factor 1 (IGF-1). Investigational studies focus heavily on its capacity to attenuate nitrogen wasting, maintain lean tissue mass, and alter bone turnover markers in preclinical research subjects.
When sourcing reagents for sensitive endocrine trials, analytical precision is paramount. PX1 Research supplies high-purity MK-677 verified via high-performance liquid chromatography (HPLC) and mass spectrometry (MS), accompanied by comprehensive endotoxin reporting for reproducible baseline metrics across all laboratory assays.
Identified in chemical literature under the registry number CAS 159752-10-3, MK-677 (Ibutamoren) represents a distinct class of non-peptide secretagogues. Developed to probe the somatotrophic signaling cascade, MK-677 functions as an agonist of the Growth Hormone Secretagogue Receptor (GHSR1a). While peptide-based secretagogues often necessitate frequent liquid preparation, MK-677 is a small-molecule compound engineered for metabolic stability during oral or systemic administration in laboratory protocols.
Primary scientific interest in MK-677 centers on its capacity to activate the anterior pituitary gland and hypothalamus. By binding to GHSR1a, the molecule triggers signal transduction cascades that result in the endogenous release of growth hormone. Because it operates through native physiological pathways, researchers utilize MK-677 to analyze natural GH pulse amplitude rather than introducing exogenous hormone isolates.
In our comprehensive research library, investigators can review comparative analyses detailing how small-molecule agonists like MK-677 modulate pituitary receptor dynamics compared to classical peptide analogues. Researchers seeking bulk quantities for long-term longitudinal studies can coordinate custom lot allocations via our wholesale portal.
The molecular mechanism of MK-677 relies on its high-affinity binding to the GHSR1a receptor, located prominently in the hypothalamus and pituitary gland. Activation of GHSR1a simulates the signal typically generated by ghrelin—the natural endogenous ligand often referred to as the 'hunger hormone.' Upon binding, MK-677 initiates intracellular calcium influx through a phospholipase C-dependent pathway, driving the exocytosis of growth hormone storage vesicles.
Crucially, preclinical data demonstrate that MK-677 amplifies the natural pulse amplitude of GH release without accelerating the fundamental pulse frequency. This distinction is vital for researchers studying physiological endocrine rhythms, as it preserves endogenous feedback loops within the somatotrophic axis. As elevated GH circulates, it stimulates hepatic production of IGF-1, leading to prolonged downstream signaling cascades.
Unlike direct administration of recombinant GH, which can lead to rapid receptor downregulation and complete suppression of the hypothalamic-pituitary-somatotropic axis, MK-677 modulation maintains physiological signaling characteristics. This makes it an invaluable tool for evaluating cellular repair mechanisms, protein synthesis pathways, and metabolic substrate shifting in preclinical research models.
Investigational literature surrounding MK-677 encompasses a wide range of physiological systems. Because growth hormone and IGF-1 are primary regulators of tissue maintenance, lipid oxidation, and cellular regeneration, researchers utilize MK-677 in several distinct experimental domains:
1. Nitrogen Balance and Protein Retention: Preclinical trials examining acute caloric restriction indicate that MK-677 administration helps attenuate nitrogen loss by promoting amino acid uptake into skeletal tissue, serving as a model for muscle-wasting disorders.
2. Bone Mineralization and Turnover Markers: Studies evaluating skeletal biology measure markers such as osteocalcin and bone-specific alkaline phosphatase. MK-677 has been shown to increase bone turnover in mature rodent models, offering insights into metabolic bone health.
3. Body Composition and Substrate Utilization: In rodent assays, sustained activation of the GHSR1a pathway by MK-677 alters energy expenditure, favoring oxidation of free fatty acids while preserving lean tissue mass.
4. Sleep Architecture and Pituitary Output: Endocrine studies tracking slow-wave sleep patterns note that GHSR activation influences circadian pituitary rhythms, providing a model for investigating sleep quality and hormonal release interaction.
When designing exploratory protocols, researchers frequently compare MK-677 against peptide-based GHS agents like Ipamorelin, CJC-1295, and Tesamorelin. Selecting the appropriate compound depends on targeted duration of action, receptor specificity, and administration logistics.
Peptides such as Ipamorelin are highly selective short-acting agonists that produce brief, sharp peaks in growth hormone secretion, mimicking a single natural pulse. Conversely, MK-677 provides an extended half-life, yielding elevated IGF-1 levels over a 24-hour window from a single administration in test subjects. While peptide agents often require reconstitution in sterile water or bacteriostatic media immediately prior to use, MK-677's non-peptidic structure grants superior structural stability in variable assay environments.
Additionally, while compounds like Tesamorelin target Growth Hormone-Releasing Hormone (GHRH) receptors, MK-677 acts strictly on the ghrelin/GHS receptor. Investigational models occasionally combine GHRH-pathway agonists with GHSR agonists to observe synergistic pituitary output, a common design in advanced growth hormone secretagogue studies.
Because small-molecule research compounds are produced via complex organic synthesis, quality control varies wildly across global vendors. Unrefined manufacturing processes can leave residual solvents, heavy metals, or unreacted synthetic intermediates in raw material batches. Laboratory buyers evaluating suppliers must demand verifiable analytical credentials before placing material into trial protocols.
Be alert to common red flags in the research chemical sector: vendor certificates that hide laboratory contact details, static COAs reused across distinct lot numbers, absence of mass spectrometry mass-verification, and a lack of explicit endotoxin testing data. Purchasing unverified reagents exposes research to batch variability, cytotoxicity, and flawed experimental conclusions.
To protect trial integrity, verify every supplier against the quantitative evaluation criteria detailed below:
To establish reagent validity, compare your vendor against these six core analytical standards:
• Purity Verification: Material must undergo Reverse-Phase High-Performance Liquid Chromatography (RP-HPLC) showing absolute chemical purity of ≥98.0%.
• Identity Confirmation: Mass Spectrometry (ESI-MS or MALDI-TOF) must match the precise molecular weight of MK-677 mesylate (628.8 g/mol).
• Endotoxin Limits: Chromogenic LAL testing must verify endotoxin content below strict thresholds (<0.05 EU/mg) to prevent inflammatory artifact in cell or animal models.
• Lot Traceability: Every individual vial or batch container must carry a distinct lot number matching an independently verifiable certificate of analysis.
• Sourcing & Synthesis: Material must originate from fully auditable USA synthesis facilities adhering to stringent ISO/GMP quality management systems.
• Dispatch Infrastructure: Reagents must ship rapidly from temperature-controlled domestic facilities (such as PX1 Research hubs in California and Arizona) to prevent thermal degradation during transit.
At PX1 Research, quality verification is not an afterthought—it is the foundation of our catalog. Every batch of MK-677 raw material undergoes a rigorous triple-tier analytical screening process by an independent, ISO 17025-accredited testing laboratory before release.
First, Reverse-Phase HPLC isolates the primary compound from trace synthesis impurities, verifying that peak area purity meets or exceeds 98%. Second, Electrospray Ionization Mass Spectrometry (ESI-MS) confirms the exact structural mass, eliminating any risk of misidentified chemical isomers or degraded raw reagents. Third, quantitative LAL endotoxin testing ensures the material is free of lipopolysaccharides that could confound sensitive cell viability or metabolic assays.
Researchers can inspect individual certificates of analysis directly on our platform prior to purchase, confirming total transparency from production to laboratory benchtop.
Proper benchtop handling is critical to preserve the chemical integrity of MK-677 during trial runs. As a mesylate salt, high-purity MK-677 typically presents as a crystalline white to off-white powder. It exhibits excellent solubility in dimethyl sulfoxide (DMSO) and ethanol, and moderate solubility in aqueous buffers depending on final pH.
For long-term storage, raw lyophilized or powdered MK-677 should be kept sealed in a desiccated environment at -20°C, protected from direct UV exposure. Under these conditions, the compound remains stable for up to 24 months. Once reconstituted in liquid solvents for in vitro assays, stock solutions should be aliquoted to avoid repeated freeze-thaw cycles and maintained at -80°C for optimal chemical stability.
Researchers working with multiple compound classes can consult our technical guides on all research peptides for detailed solvent compatibility tables and storage recommendations across varied assay matrices.
Acquiring analytical-grade MK-677 for your laboratory is streamlined through the PX1 Research procurement portal. We supply reference compounds formatted specifically for in vitro research and preclinical trial applications, packaged in high-barrier borosilicate vials to protect chemical purity.
All orders placed before 3:00 PM EST, Monday through Friday, ship the same day from our domestic dispatch centers located in California and Arizona. Fast, fully tracked transit ensures your reagents arrive without exposure to excessive transit delays or unmonitored environmental conditions.
Each shipment includes complete lot documentation linking directly to third-party HPLC, MS, and endotoxin certificates. If your research team requires bulk synthesis or specific lot reservation, contact our technical support staff directly via our wholesale procurement platform to reserve dedicated reagent lots.
Ready to order reference-grade MK-677 for your laboratory? Visit the official MK-677 product page to view current lot COAs and complete your request.
what is mk677
MK-677 (Ibutamoren) is an orally active, non-peptidic growth hormone secretagogue that selectively targets the ghrelin receptor (GHSR1a). In preclinical research, it amplifies endogenous pulsatile growth hormone release and raises circulating IGF-1 levels without significantly elevating cortisol or prolactin.
Is MK-677 a peptide or a small molecule?
MK-677 is a non-peptidic small molecule. Unlike peptide secretagogues that feature amino acid chains susceptible to enzymatic cleavage in the digestive tract, MK-677's organic structure allows for metabolic stability across systemic administration routes in preclinical models.
How does MK-677 increase IGF-1 levels in research models?
MK-677 binds directly to GHSR1a receptors in the hypothalamus and anterior pituitary, stimulating pulsatile growth hormone release. Increased circulating growth hormone acts upon hepatic tissue to stimulate downstream synthesis and secretion of Insulin-like Growth Factor 1 (IGF-1).
What is the difference between MK-677 and Ipamorelin?
While both target the ghrelin receptor to release growth hormone, MK-677 is a small molecule with a long extended half-life that provides sustained 24-hour IGF-1 elevation. Ipamorelin is a short-acting peptide that creates rapid, selective GH spikes of shorter duration.
Do you provide a COA for my lot?
Yes. Every single batch of MK-677 supplied by PX1 Research comes with a lot-specific Certificate of Analysis from an independent ISO 17025-accredited laboratory, detailing RP-HPLC purity, mass spectrometry confirmation, and LAL endotoxin levels.
What solubility solvent should be used for MK-677 in vitro assays?
MK-677 mesylate readily dissolves in dimethyl sulfoxide (DMSO) and ethanol at concentrations exceeding 20 mg/mL. For cell culture work, stock solutions can be prepared in DMSO and diluted into aqueous culture media immediately prior to testing.
Is MK-677 legal to buy in the US?
Yes. MK-677 is legal to purchase in the United States as a research chemical intended strictly for laboratory, in vitro, and preclinical experimentation. It is not approved for human consumption or therapeutic use.
How fast does PX1 Research ship orders?
PX1 Research dispatches all domestic orders placed before 3:00 PM EST, Monday through Friday, on the same business day from temperature-controlled fulfillment facilities in California and Arizona.
Can MK-677 be combined with other GH secretagogues in preclinical research?
Yes. In exploratory endocrine research, MK-677 is frequently studied alongside GHRH receptor agonists like CJC-1295 or Tesamorelin to analyze dual-pathway synergistic activation of pituitary somatotrope cells.
What are the storage requirements for raw MK-677 powder?
Raw MK-677 powder should be stored sealed at -20°C in a dry, desiccated environment away from light. Under proper low-temperature storage conditions, the chemical compound maintains purity stability for up to 24 months.
All products are sold strictly for laboratory and research use only. Not for human or veterinary use, diagnosis, treatment or consumption. Statements have not been evaluated by the FDA.