Why this batch
Key highlights
Long-lasting stabilitySuspended in USP-grade PEG-400 for reliable solubility and shelf-life in research applications.
25 mg/mL concentrationPrecisely measured liquid with under 5% concentration variance for reproducible results.
Independently verifiedEvery batch is HPLC-tested by an accredited US third-party lab for purity and identity.
Research use onlySupplied exclusively for laboratory investigation and development. Technical data
Product specifications
Liquid Ibutamoren (MK-677) — 25 mg/mL Compound Class Growth Hormone Secretagogue · Ghrelin Receptor (GHSR-1a) Agonist Concentration 25mg/mL Composition USP-grade PEG-400 base, MK-677 (≥98% purity) CAS Number 159752-10-0 Chemical Formula C27H36N4O5S Molar Mass 528.66 g/mol Half-Life ~24 hours Synonyms Ibutamoren, Nutrobal, MK-0677, L-163,191 Volume 30 mL per bottle Verified Purity Batch-tested to 99.87% (HPLC) Terms For laboratory research use only. Not for human or animal consumption.
View certificates of analysis Sourcing & quality
Why source MK-677 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 SARMs and reported wide gaps between labels and contents.
52%contained the labeled compound
39%contained an unapproved drug
25%contained an unlabeled substance
9%contained no active ingredient
Source: Van Wagoner et al., JAMA, 2017 (ref. 2).
Third-party tested & certified
Minimum 98% purity, verified by MZ Biolabs (Tucson, AZ), an accredited US laboratory.
USP-grade PEG-400
Suspended in the highest grade carrier and bottled in America.
Glass bottles, fixed glass droppers
Prevents BPA leaching and avoids contamination from external tools.
60-day money-back guarantee
Transparent business, standard payment methods, no misrepresentation. Research context
What is MK-677?
MK-677 (Ibutamoren) is a non-peptide ghrelin receptor (GHSR-1a) agonist and growth hormone secretagogue. Mechanistically, it binds and activates the GHSR-1a receptor — the same receptor targeted by the endogenous peptide ghrelin — at sites in the hypothalamus and anterior pituitary. In the research literature this receptor activity is characterized as stimulating signaling along the growth hormone–IGF-1 axis (ref. 1). Unlike peptide-based secretagogues, MK-677 is orally bioavailable in study models.
Although MK-677 is frequently catalogued alongside selective androgen receptor modulators (SARMs), this is a cataloguing convention rather than a pharmacological classification: it is structurally and mechanistically distinct and does not bind the androgen receptor (ref. 1). It has been an investigational compound since the 1990s and remains experimental, 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.
Regulatory & compliance status
Important regulatory information
Not approved for human use
MK-677 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.
WADA-prohibited
Listed by the World Anti-Doping Agency under S2 (Peptide Hormones, Growth Factors, Related Substances and Mimetics), banned both in- and out-of-competition (ref. 3).
Legal status for research
In the United States, MK-677 is not a controlled substance and may be legally purchased and possessed for laboratory research use.
Our position
Sports Technology Labs are chemical suppliers, not medical providers. We do not condone or encourage consumer use of research compounds. Citations
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. 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.