MK-677
MK-677Orally active growth-hormone secretagogue.
Also known as: Ibutamoren, Ibutamoren Mesylate
Overview
MK-677 (ibutamoren) is an orally active, non-peptide growth-hormone secretagogue studied for sustained elevation of GH and IGF-1 in research models.
A rare orally active, non-peptide GH secretagogue with a long half-life supporting once-daily dosing. Research reports sustained elevation of GH and IGF-1; its small-molecule structure resists digestive breakdown, unlike injectable peptide secretagogues.
Mimics ghrelin at the GH-secretagogue receptor as a small molecule, increasing GH and IGF-1 with oral bioavailability.
Molecular information
Ibutamoren is a spiropiperidine small molecule, not a peptide — hence oral stability.
Pharmacokinetics
Illustrative relative-concentration model derived from published pharmacokinetic research. Curve is normalized and provided for educational comparison only — not a dosing schedule.
Research applications
- Oral GH-secretagogue research
- IGF-1 elevation studies
- Body-composition investigations
Research protocols
Protocols summarized from published research models. Provided for scientific reference only — not dosing guidance for human use.
Observed effects timeline
Aggregated observations reported across research literature. Timing and magnitude vary by model and are not a guarantee of outcome.
Week 1–2
Onset of elevated GH/IGF-1; increased appetite and sleep changes commonly reported.
Week 4–8
Sustained IGF-1 elevation and body-composition changes reported in studies.
Ongoing
Some water retention reported; effects reverse after discontinuation.
Research compatibility
Describes how compounds are studied alongside one another in the literature. Not a recommendation to co-administer.
Ipamorelin
Overlapping secretagogue activity; monitor in research designs.
CJC-1295 (with DAC)
Both elevate GH/IGF-1 by different routes.
HGH
Redundant GH-axis stimulation.
BPC-157
Distinct pathways; no documented interference.
Quality indicators
Consistent oral form
Research material is typically a capsule, tablet, or solution; verify labeled concentration.
Dry storage
As a stable small molecule, MK-677 does not require cold-chain handling like peptides.
Slight clumping
Small clumps that dissolve completely with gentle swirling are acceptable — shipping can cause minor compaction.
Collapsed or melted appearance
Powder that looks collapsed, melted, or stuck to the vial walls may have been exposed to heat in transit.
Cloudy after reconstitution
Persistent cloudiness, particles, or precipitate after gentle mixing can indicate a degraded or contaminated peptide.
Reported observations & safety
Safety signals reported in the research literature. Compiled for scientific awareness — not medical advice.
- Increased appetite is among the most commonly reported effects (ghrelin-receptor activity).
- Transient water retention, mild fatigue, and changes in fasting glucose/insulin are reported.
- IGF-1 and glucose monitoring are standard in research designs.
References & further reading
MK-677 (ibutamoren) sustained GH/IGF-1 elevation (JCEM)
Study reporting that oral ibutamoren increased GH and IGF-1 with once-daily dosing in research participants.
View studyTopics
This entry is provided for educational and informational purposes only. It is not medical advice, a dosing protocol, or a claim of therapeutic benefit. Research compounds are supplied strictly for laboratory and research use — not for human or veterinary consumption.
Substantial peer-reviewed research across multiple models.
This compound is part of our educational reference and is not currently stocked. Browse the catalogue for available research-grade peptides.
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