MK-677 is a compound that people take as a daily pill to naturally boost their body's production of growth hormone, which is why it's popular for building muscle, improving recovery, and potentially slowing some aspects of aging. Think of it as a way to turn up your body's own growth hormone factory rather than injecting synthetic hormones from the outside.
Here's how it works: your body naturally produces a hormone called ghrelin that does two main things - it makes you feel hungry and tells your brain to release growth hormone. MK-677 is like a clever mimic that copies ghrelin's second job. When you take it, the compound travels to your brain and basically knocks on the same doors that ghrelin would, specifically in areas called your pituitary gland and hypothalamus. These areas respond by releasing pulses of growth hormone throughout the day, just like your body would naturally do, but at higher levels.
That growth hormone then travels to your liver, which responds by producing something called IGF-1. This IGF-1 is what actually does the heavy lifting - it helps your muscles build protein, encourages your body to burn fat for energy, and speeds up tissue repair. As a bonus, MK-677 also improves your deep sleep quality, which is when most of your natural recovery happens anyway.
Dosage Information
Typical Dose
10-25 mg daily
Frequency
Once daily, typically at bedtime
Administration
Oral capsule or liquid
Half-Life
4–6 hours
Notes
Bedtime dosing takes advantage of the sleep-enhancing effects and aligns with the natural nocturnal GH pulse. Lower doses (10mg) minimize water retention and appetite stimulation while preserving most GH benefits.
Why this matters
Oral GH secretagogue; once-daily dosing maintains elevated IGF-1 for 24 hours.
Protocol cycle
Where does MK-677 sit?
See how this peptide compares across all 150 peptides in our database.
Evidence Score
0.74
Compound Data
Molecular Formula
C28H40N4O8S2
Molecular Weight
624.80 g/mol
IUPAC Name
2-amino-2-methyl-N-[(2R)-1-(1-methylsulfonylspiro[2H-indole-3,4'-piperidine]-1'-yl)-1-oxo-3-phenylmethoxypropan-2-yl]propanamide;methanesulfonic acid
PubChem CID
6450830Potential Side Effects
MK-677 discussions
Quick Facts
- Administration
- Oral capsule or liquid
- Typical Dose
- 10-25 mg daily
- Frequency
- Once daily, typically at bedtime
- References
- 0 curated + 48 from PubMed
- Clinical Trials
- 8 registered
- Evidence Score
- 0.7 / 100
Frequently Asked Questions about MK-677
What is MK-677?
MK-677 (Ibutamoren) is a potent orally active growth hormone secretagogue and ghrelin receptor agonist that stimulates the pituitary gland to release growth hormone and IGF-1. Unlike injectable GH secretagogues it is taken as a daily oral tablet making it one of the most accessible GH-stimulating compounds available. MK-677 has completed multiple clinical trials demonstrating increases in GH and IGF-1 levels improvements in lean body mass bone density and sleep quality. It is widely used in the research community for muscle growth anti-aging applications and improving recovery.
How does MK-677 work?
MK-677 acts as a selective agonist of the ghrelin receptor (GHSR-1a) mimicking the action of ghrelin — the endogenous hunger and GH-releasing hormone. By binding to GHSR-1a in the pituitary gland and hypothalamus MK-677 stimulates the pulsatile release of growth hormone through pathways that complement and enhance those activated by GHRH. Unlike exogenous GH administration MK-677 preserves the natural pulsatile pattern of GH secretion and works through the body's own regulatory feedback mechanisms. The resulting GH pulse stimulates hepatic IGF-1 production which mediates downstream anabolic effects including muscle protein synthesis lipolysis and tissue repair. MK-677 also increases deep sleep duration by enhancing slow-wave sleep — an effect mediated through central ghrelin receptor activation in sleep-regulating brain circuits.
What is the recommended dosage for MK-677?
The typical dose is 10-25 mg daily. Once daily, typically at bedtime. Administration: Oral capsule or liquid. Bedtime dosing takes advantage of the sleep-enhancing effects and aligns with the natural nocturnal GH pulse. Lower doses (10mg) minimize water retention and appetite stimulation while preserving most GH benefits.
What are the side effects of MK-677?
Increased appetite — significant and common. Water retention and mild edema (common). Fatigue or lethargy especially initially (common). Elevated fasting glucose — monitor in pre-diabetics (uncommon). Tingling or numbness in extremities (uncommon). Joint pain at higher doses (uncommon)
What is the MK-677 cycle protocol?
MK-677 is typically cycled continuous. Daily bedtime dosing, no cycling protocol mentioned
Questions reflect common community inquiries. This is not medical advice.