MK-677 (Ibutamoren) — Dosing, Cycles, Half-Life & Side Effects

MK-677 (Ibutamoren) is an oral growth-hormone secretagogue with a half-life of 24 hours. Non-peptide oral ghrelin mimetic that stimulates sustained GH and IGF-1 release. Dramatically improves sleep quality and increases appetite. Not technically a peptide but functions similarly. This page is educational harm-reduction reference compiled from peer-reviewed literature — not medical advice, not an endorsement, not a recommendation to use. Consult a licensed clinician before any decision.

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Quick Facts

Class	Oral GH Secretagogue
Half-life	24 hours
Detection window	14 days
Hepatotoxicity	Low
Suppression	0/10
Administration	oral

Typical Dosing Ranges

Common dose range: 10-25mg/day (before bed)

Cycle length: 12-24 weeks

Time to steady state: ~2 days

Dose ranges are compiled from published pharmacokinetic studies and community-reported usage. Where a value is community-reported rather than clinically studied, this page and its structured data flag it. Lower end of any range is always the safer starting point.

Stacking Considerations

No structural stacking blockers. Standard harm-reduction rules apply: minimize total androgen load, minimize oral exposure, and monitor bloodwork.

PCT Requirements

Depot clearance estimate: ~1 days post-last-dose before SERM start (5 × apparent depot half-life of 6h).
Never stack two SERMs. Extend a single SERM (tamoxifen OR enclomiphene/clomiphene) rather than combining.
Use the cycle planner to generate a full protocol based on your complete stack, not this compound alone.

Side Effect Profile

Significant appetite increase
Water retention and bloating
May increase blood glucose/insulin resistance
Lethargy at high doses
Long-term safety uncertain

Known Interactions

mk677 + HGH Fragment 176-191
minor — synergistic
MK-677 and GH both increase GH/IGF-1. May cause excessive GH-related sides.
Recommendation: Generally redundant. Choose one for cost-effectiveness.
Monitor: IGF-1, Blood glucose, Water retention

Monitoring (Bloodwork & Vitals)

Comprehensive metabolic panel (baseline, mid-cycle, post-cycle)
Lipid panel (total cholesterol, HDL, LDL, triglycerides)
CBC (hemoglobin, hematocrit — watch for erythrocytosis)
Sex-hormone panel (Total T, Free T, Estradiol sensitive, SHBG, LH, FSH)
Blood pressure (weekly self-check; flag systolic >140 or diastolic >90)

Baseline bloodwork is recommended before any cycle. Discontinue if liver enzymes exceed 3× upper limit of normal or if hematocrit exceeds 54%.

Frequently Asked Questions

What is the half-life of MK-677 (Ibutamoren)?

MK-677 (Ibutamoren) has a half-life of approximately 24 hours. Clearance estimate: 6h × 5 = 30h = 1.25 days. This figure is used to determine injection frequency (for esters) and post-cycle clearance timing.

What is the typical dose range for MK-677 (Ibutamoren)?

Commonly reported ranges for MK-677 (Ibutamoren): 10-25mg/day (before bed). Cycle length: 12-24 weeks. These are compiled from published studies and community-reported usage — individual response varies and lower end is always preferred.

Does MK-677 (Ibutamoren) suppress natural testosterone?

MK-677 (Ibutamoren) causes minimal suppression of the HPTA axis (score 0/10). PCT may still be advisable depending on stack and duration.

Is MK-677 (Ibutamoren) liver toxic?

Hepatotoxicity rating: Low. Non-17αα compound — liver stress is lower but still warrants periodic monitoring during a cycle.

What is MK-677 (Ibutamoren) typically used for?

MK-677 (Ibutamoren) is commonly used for: Recovery, Sleep improvement, Body composition, Anti-aging. Intended-use context does not imply safety — every use case carries the same underlying pharmacological risks.

Citations

Disclaimer

StackItSmart is an independent harm-reduction reference. The content above is compiled from peer-reviewed literature and is not medical advice, not an endorsement, and not a recommendation to use MK-677 (Ibutamoren). Performance-enhancing compounds carry legal, endocrine, cardiovascular, and hepatic risks. Consult a licensed clinician before any decision. StackItSmart does not provide sourcing, procurement, or dosing prescriptions.