Key highlights
Product specifications
| Compound Class | Growth Hormone Secretagogue · Ghrelin Receptor (GHS-R1a) Agonist · Non-steroidal |
|---|---|
| Concentration | 20 mg/mL |
| Composition | USP-grade PEG-400 and ethanol base, MK-777 (≥99% purity) |
| CAS Number | 950841-87-9 |
| Chemical Formula | C28H35FN4O5S |
| Molar Mass | 558.68 g/mol |
| Synonyms | MK-777, Acetamoren, MK777 |
| Volume | 30 mL per bottle (600 mg total) |
| Verified Purity | Batch-tested to 99.12% (HPLC) |
For laboratory research use only. Not for human or animal consumption.
View certificates of analysisIndependently verified
This compound is analyzed by an accredited US third-party laboratory before it ships.
Purity and identity confirmed by MZ Biolabs (Tucson, AZ), a US DEA-licensed analytical facility, via HPLC purity analysis and mass-spectrometry identity confirmation under GLP standards.
Our third-party certificates of analysis are published on our website — no login required.
MK-777 (Acetamoren)99.12% pure
Storage & handling
This bottle is built to preserve compound integrity throughout your research timeline.
- Storage: Keep in a cool, dry place away from direct sunlight to maximize shelf life.
- UV-resistant glass bottle with fixed glass dropper to minimize degradation and avoid plasticizer (BPA) leaching.
- Tamper-proof seal to ensure integrity in transit.
- Graduated 1 mL glass pipette included for precise measurement.
- Evaporation-resistant formulation and packaging for stable storage.
Why source MK-777 from Sports Technology Labs
Quality control across the research-compound industry is inconsistent, which makes third-party verification essential. A 2017 analysis published in JAMA examined 44 products marketed online as research androgen-receptor compounds and reported wide gaps between labels and contents.
Source: Van Wagoner et al., JAMA, 2017 (ref. 3).
Verified by MZ Biolabs (Tucson, AZ), an accredited US laboratory, via HPLC and mass spectrometry.
Suspended in a dual-solvent carrier system selected for this compound and bottled in America.
Prevents BPA leaching and avoids contamination from external tools.
Transparent business, standard payment methods, no misrepresentation.
What is MK-777?
MK-777, also known as Acetamoren, is a synthetic non-peptide growth hormone secretagogue and ghrelin receptor (GHS-R1a) agonist. Mechanistically, it binds and activates the GHS-R1a receptor — the same receptor targeted by the endogenous peptide ghrelin and by the related compound MK-677 (ibutamoren), of which it is described as a structural analog. It is not a SARM.
MK-777 is a comparatively new research chemical, and published characterization data remain limited. It is formulated here in a PEG-400 and ethanol solvent system selected to support solubility and solution consistency.
MK-777 is an experimental research chemical, supplied strictly for laboratory research. Sports Technology Labs makes no claims regarding its effects, and nothing in this listing should be interpreted as describing outcomes in humans or animals.
Important regulatory information
MK-777 is an investigational compound. It is not approved by the FDA and is not a dietary supplement, drug, or food. Marketing it for human ingestion is unlawful.
As a growth hormone secretagogue and ghrelin receptor agonist, MK-777 falls under the World Anti-Doping Agency’s S2 category (Peptide Hormones, Growth Factors, Related Substances and Mimetics), prohibited in- and out-of-competition (ref. 4).
In the United States, MK-777 is not a controlled substance and may be legally purchased and possessed for laboratory research use.
Sports Technology Labs are chemical suppliers, not medical providers. We do not condone or encourage consumer use of research compounds.
Scientific references
- Patchett AA, et al. Design and biological activities of L-163,191 (MK-0677): a potent, orally active growth hormone secretagogue. Proc Natl Acad Sci USA. 1995;92(15):7001–7005.
- National Center for Biotechnology Information. PubChem Compound Summary for Acetamoren / MK-777 (CAS 950841-87-9): molecular formula, molecular weight, and classification. PubChem, National Library of Medicine.
- Van Wagoner RM, et al. Chemical composition and labeling of substances marketed as SARMs and sold via the internet. JAMA. 2017;318(20):2004–2010.
- WADA Prohibited List (2025), Section S2: Peptide Hormones, Growth Factors, Related Substances and Mimetics. WADA.org.
Research use only. All products on this website are intended exclusively for laboratory research and development. They are not for human or animal consumption. These statements have not been evaluated by the U.S. Food and Drug Administration, and these products are not intended to diagnose, treat, cure, or prevent any disease.
MK-777 FAQs
This formulation uses a dual-solvent system specifically selected for MK-777. It differs from other STL liquid formulations based on compound chemistry requirements.
