MK-677 (Ibutamoren) Research Guide

Full name: Ibutamoren Mesylate (MK-677)

An orally active non-peptide GH secretagogue that mimics ghrelin signaling. Increases GH and IGF-1 for 24 hours from a single oral dose.

How MK-677 (Ibutamoren) Works

Acts as ghrelin mimetic at GHS-R1a receptors in hypothalamus and pituitary. Excellent oral bioavailability and 24-hour duration.

Dosing Protocol

• Typical dose: 10-25 mg
• Frequency: Once daily
• Duration: 12-24 week cycles
• Route: Oral (capsule/liquid)

Reported Benefits

• Oral administration
• Sustained 24h GH elevation
• Increased IGF-1
• Improved sleep depth
• Enhanced recovery
• Bone density support

Potential Side Effects

• Increased appetite
• Water retention/edema
• Insulin resistance (long-term)
• Lethargy
• Joint pain
• Numbness

Research Citations

1. Two-year MK-677 treatment in elderly (2008) - Reversed diet-induced nitrogen wasting, increased lean mass by 1.5kg, and elevated IGF-1 to young-adult levels.
2. Effects of ibutamoren on bone mineral density (2019) - 12 months increased BMD at femoral neck by 3.2% with sustained IGF-1 elevation.

Related Growth Hormone Compounds

• CJC-1295 - Full Profile
• Ipamorelin - Full Profile
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• Tesamorelin - Full Profile
• GHRP-2 - Full Profile
• GHRP-6 - Full Profile

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