MK-677 (Ibutamoren) Dosage Guide: Oral Dosing, Timing, and Research Protocol
Complete guide to MK-677 oral dosing protocols, timing considerations, standard research dose ranges, and cycle guidance for GH secretagogue research without injection.
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MK-677 (Ibutamoren) is a non-peptide oral GH secretagogue (GHS-R1a agonist) that stimulates pituitary GH release without injection. It is the only oral GH secretagogue with robust published human data. This guide covers dosing, timing, and research protocols.
What MK-677 Comes In
Unlike injectable peptides, MK-677 does not require reconstitution. It is available as:
- Capsules or tablets: 10 mg, 12.5 mg, 25 mg per unit
- Liquid oral solution: typically 25 mg/mL
- Powder (for custom dosing)
No reconstitution is needed for capsule/tablet forms.
Standard Research Dosage Ranges
| Protocol | Dose | Timing |
|---|---|---|
| Low dose / tolerance testing | 10 mg/day | Bedtime |
| Standard research dose | 25 mg/day | Bedtime |
| High dose protocol | 50 mg/day | Divided: AM + bedtime |
| Clinical trial dose | 25 mg/day | Once daily |
The most well-studied dose is 25 mg once daily at bedtime, which is used in the majority of published clinical trials.
Timing and GH Response
MK-677's timing significantly affects the GH pulse profile:
- Bedtime dosing: Amplifies the natural nocturnal GH pulse; most recommended approach
- Morning fasting: Also effective; useful when bedtime dosing causes sleep disturbances
- With food vs. fasting: Absorption is not significantly affected by meals, but GH response may be slightly blunted immediately post-meal due to insulin
Dosing Schedule Comparison
| Schedule | GH Effect | IGF-1 Effect | Convenience |
|---|---|---|---|
| 25 mg bedtime | Robust nocturnal pulse | +50-70% at 12 weeks | Easy |
| 25 mg AM | Good daytime pulse | +50-70% at 12 weeks | Easy |
| 50 mg divided | Higher overall AUC | +65-85% at 12 weeks | Moderate |
Use the Dose Calculator if dosing MK-677 by body weight; standard research doses are typically flat-rate rather than weight-based.
Cycle Length and Cycling
- MK-677 has a long half-life (~24 hours); once-daily dosing maintains stable plasma levels
- Cycle length: Most research runs 6–12 months; some protocols are year-round
- Cycling: Unlike injectable GHS, MK-677 does not appear to desensitise receptors over 12-month periods
- Side effects (water retention, increased appetite, mild insulin resistance) often prompt 8 weeks on, 2 weeks off approaches
Common Side Effects to Monitor
- Water retention (especially early)
- Increased appetite (GHS-R1a mediated)
- Mild joint discomfort (related to fluid retention and IGF-1 elevation)
- Transient blood glucose elevation (monitor with chronic use)
Storage
- Capsules/tablets: Room temperature, away from heat and moisture
- Liquid solutions: 2–8°C; protected from light
- Powder: -20°C for long-term storage
Calculate Your Exact Injection Volume
Use our free dose calculator — enter any vial size and target dose to get the precise volume to draw up.
About the Author
KnowYourPeptide Research Team
KnowYourPeptide Research Team
Content produced by the KnowYourPeptide research and editorial team. All articles are written from peer-reviewed primary literature and reviewed for scientific accuracy by credentialed researchers and a board-certified physician before publication.
Meet the full editorial teamMedically Reviewed by Dr. Amanda Reid, MD
This article has been reviewed by Dr. Amanda Reid, MD (Board-Certified Internal Medicine), Know Your Peptide Medical Advisor, for scientific accuracy, safety information, and appropriate clinical context. Learn about our review process.