MK-677 Dosing: 10-25mg Before Bed, Why Timing

MK-677 (ibutamoren) is a non-peptide growth hormone secretagogue that mimics ghrelin to stimulate natural GH release. Unlike true peptides, it's orally bioavailable — no injection required. Clinical trials with human data span up to 2 years of continuous use. This is not medical advice.

Quick Reference: Community Protocol

MK-677 is not in the standard cheat sheet — this is a community protocol directly informed by clinical trial data (25 mg daily used in major studies).

For the full MK-677 profile, vendor pricing, and stack protocols, see our MK-677 peptide page.

Cycling Details

Start at 10 mg daily for weeks 1-2 to assess tolerance. Appetite increase and water retention are most pronounced in the first 1-2 weeks. Increase to 15-25 mg daily based on response — most users settle at 20-25 mg for optimal GH stimulation.

The 8-12 week on / 4 week off cycle prevents receptor desensitization, though the 2-year Nass study showed sustained effects with continuous use. MK-677's ~24 hour half-life means levels reach steady state quickly and clear within days of discontinuation.

Why before bed: Natural GH release peaks during deep sleep. Bedtime dosing aligns with this rhythm, may enhance sleep quality, and mitigates daytime appetite stimulation.

Routes of Administration

Oral (only route): MK-677 has excellent oral bioavailability (~60-70%) due to its non-peptide structure — it survives stomach acid intact. Liquid solutions (1 mL dropper dosing) are most common. Capsules provide standardized dosing. Sublingual absorption is also effective but unnecessary given oral bioavailability.

Reconstitution Quick Reference

No reconstitution needed — MK-677 is taken orally as a pre-mixed liquid solution or capsule. Dose with the provided dropper or as labeled.

Where These Numbers Come From

MK-677 has substantial human clinical data — rare for a non-FDA-approved GH compound.

Murphy et al. (1998) showed 25 mg daily reversed diet-induced catabolism and significantly increased GH and IGF-1 levels (PMID 9467534). The landmark Nass et al. (2008) 2-year study using 25 mg daily demonstrated sustained increases in GH, IGF-1, and lean body mass with an acceptable safety profile (PMID 18981485).

This is rare in the peptide world — community doses directly mirror clinical trial dosing. 25 mg daily was the standard efficacy dose, 10 mg showed activity with diminished returns, and doses above 50 mg showed no additional benefit but increased side effects.

Stacking Protocols

MK-677's oral route means no injection site competition. It can run longer cycles than most injectables. Monitor blood sugar more closely when stacking multiple GH compounds.

Side Effects & Safety

• Increased appetite — 80%+ of users, usually within the first week
• Water retention/edema — mild to moderate, typically subsides after 2-4 weeks
• Mild insulin resistance — temporary and reversible upon discontinuation
• Lethargy/fatigue — especially first 2-3 weeks
• Joint stiffness — from water retention, usually mild
• Elevated prolactin — in some individuals, typically not clinically significant
• Carpal tunnel symptoms — rare, from water retention

Long-term safety (2-year Nass study): No significant changes in prostate, cardiovascular markers, or cancer incidence. Reversible mild insulin resistance. Safe discontinuation with return to baseline in 2-4 weeks.

Managing sides: Start at 10 mg, take before bed, manage carbohydrate intake for insulin sensitivity, stay hydrated.

Frequently Asked Questions

What is the standard MK-677 dose?

10-25 mg taken orally before bed, daily for 8-12 weeks followed by 4 weeks off. This directly matches clinical studies that used 25 mg daily.

Is MK-677 actually a peptide?

No — it's a non-peptide growth hormone secretagogue. Orally bioavailable, no injection required. It mimics ghrelin to stimulate natural GH release from the pituitary.

Why is MK-677 taken at night?

Natural GH peaks during deep sleep. Bedtime dosing aligns with this rhythm, may enhance sleep, and mitigates daytime appetite stimulation.

How long should an MK-677 cycle last?

8-12 weeks on, 4 weeks off. The 2-year clinical study showed continuous use was tolerable, but cycling is recommended to prevent desensitization.

What are MK-677's main side effects?

Increased appetite (80%+), water retention, mild insulin resistance, and initial lethargy. Generally dose-dependent and often subside after 2-3 weeks.

Can I take MK-677 with other peptides?

Yes — it stacks well with ipamorelin, CJC-1295, or GHRPs. Works via ghrelin receptors while others work via GHRH — complementary mechanisms.

Will MK-677 show up on drug tests?

Prohibited by WADA. Not in standard employment drug screens but detectable with specialized testing.

Related Guides

• MK-677 peptide page — vendor pricing and full compound profile
• MK-677 Benefits Guide — GH elevation, sleep, and body composition effects
• MK-677 Results Timeline — week-by-week expectations from day 1 through month 6
• Ipamorelin Dosing Guide — injectable GHRP alternative
• CJC-1295 + Ipamorelin Stack Guide — GHRH/GHRP stacking with MK-677
• GHRP-2 Dosing Guide — injectable GH secretagogue
• Calculate Your MK-677 Cycle Cost — estimate cost for your protocol
• Best Peptides for Muscle Growth (2026) — all 10 muscle-building peptides ranked

References

For educational and research purposes only. This is not medical advice. MK-677 is not FDA-approved for any indication and is sold as a research chemical.