MK-677
Ibutamoren
The potent, orally-active secretagogue for sustained growth hormone release.
MK-677, also known as Ibutamoren, is a non-peptide, orally-active small molecule that mimics the action of the hormone ghrelin. By binding to the ghrelin receptor, it potently stimulates the pituitary gland to release growth hormone (GH). Its major advantage is its oral bioavailability, eliminating the need for injections while providing a sustained increase in GH and IGF-1 levels.
Key Benefits
Mechanism of Action
MK-677 is a selective agonist of the ghrelin receptor (GHSR). This binding action stimulates the pituitary gland to secrete growth hormone in a pulsatile manner, similar to the body's natural rhythm but with increased amplitude and frequency. This leads to a significant and durable increase in circulating levels of both GH and Insulin-like Growth Factor 1 (IGF-1) without significantly affecting cortisol levels.
Dosing Guidelines
Typical Dose
10-25 mg
Frequency
1x daily
Duration
8-16 weeks
Note: Best taken orally on an empty stomach before bed. This timing aligns with the body's natural GH pulse during sleep and helps mitigate potential side effects like lethargy.
Research & Studies
A deep dive into the mechanisms, benefits, side effects, and research protocols for the oral growth hormone secretagogue, MK-677.
Read Full ResearchA 12-month clinical trial showing MK-677 increased lean body mass and GH/IGF-1 levels in healthy older adults.
Read Full ResearchAn analysis of the pros and cons of using the oral secretagogue MK-677 versus injectable peptides like Ipamorelin or CJC-1295.
Read Full ResearchPotential Side Effects
Reported side effects may include:
- • Increased appetite and hunger (very common)
- • Mild lethargy or fatigue, especially upon waking
- • Water retention and potential for mild edema in extremities
- • Possible decrease in insulin sensitivity with long-term use
- • Numbness or tingling in hands/feet (paresthesia)
- • Possible elevation of prolactin (less common)
This information is for research purposes only. Always consult with a healthcare professional.
Popular Stacking Options
MK-677 + CJC-1295 / Ipamorelin
Combines the steady, long-acting GH elevation from MK-677 with the sharp, biomimetic pulse from CJC/Ipamorelin for a powerful synergistic effect on overall GH levels.
Shop this stackMK-677 + Tesamorelin
Tesamorelin specifically targets visceral fat reduction while MK-677 provides a broader increase in GH/IGF-1 for muscle growth and recovery, creating a comprehensive body recomposition stack.
Shop this stackMK-677 + BPC-157 / TB-500
While BPC-157 and TB-500 provide targeted tissue repair, the elevated IGF-1 from MK-677 creates a systemic anabolic and regenerative environment that can accelerate the healing process.
Shop this stackFrequently Asked Questions
Is MK-677 a SARM or a peptide?
Neither. MK-677 is a non-peptide small molecule that acts as a ghrelin receptor agonist. It's often mistakenly grouped with SARMs because it's orally active and sold by the same vendors, but its mechanism is completely different and does not involve androgen receptors.
When is the best time to take MK-677?
Most researchers dose it before bed. This aligns with the body's largest natural growth hormone pulse during sleep and helps mitigate the potential side effect of lethargy. Taking it in the morning can lead to significant daytime sleepiness and intense hunger for some.
Will MK-677 cause a 'GH bleed'?
No, that's a misconception from older, less specific secretagogues. MK-677 causes a pulsatile release of GH, mimicking the body's natural patterns by increasing the amplitude and number of pulses. It does not cause a continuous, unnatural 'bleed' of growth hormone.
How long does it take to see results from MK-677?
Effects like improved sleep and increased hunger can be noticed within the first week. Changes in body composition, such as increased muscle fullness from water retention and actual tissue growth, typically become more apparent after 4-6 weeks of consistent use as IGF-1 levels accumulate.
Does MK-677 require a PCT (Post-Cycle Therapy)?
No. MK-677 does not suppress your natural testosterone production, as it doesn't interact with the HPTA (Hypothalamic-Pituitary-Testicular Axis). Therefore, no PCT is required after discontinuing its use.
Ready to Purchase MK-677?
Get pharmaceutical-grade MK-677 from Peptide Palace with 99%+ purity, third-party lab testing, and same-day dispatch.
Buy MK-677 Now