Non-peptide growth hormone secretagogue

MK-677
prescription — get notified.

MK-677 (ibutamoren) is an orally active growth hormone secretagogue that stimulates the ghrelin receptor to increase endogenous GH and IGF-1 production — without injections. Enter your email to be notified if prescription access opens.

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CompoundMK-677
Also known asIbutamoren
Molecular weight528.67 g/mol
AdministrationOral daily
Not a SARM — not a peptide

What MK-677 actually is.

MK-677 is frequently mislabeled as a SARM. It is not. It is a non-peptide ghrelin receptor agonist that stimulates your body's own growth hormone production — orally, once daily, without injections.

01

Oral GH secretagogue

Unlike injectable growth hormone peptides (CJC-1295, GHRP-6, ipamorelin), MK-677 is taken as an oral capsule or tablet. It crosses the GI barrier intact and activates the ghrelin receptor (GHSR) to trigger pulsatile GH release from the pituitary — the same natural pattern as endogenous growth hormone secretion.

02

24-hour GH elevation

MK-677 has a half-life of approximately 4–6 hours, but its effect on GH pulsatility persists for a full 24 hours. A single daily dose produces sustained elevation of GH and IGF-1 levels without the supraphysiological peaks and troughs associated with exogenous HGH injection.

03

Extensive clinical data

MK-677 has been studied in multiple randomized controlled trials in humans — including studies on body composition, sleep quality, bone density, and nitrogen balance. Unlike many research compounds, ibutamoren has real human clinical trial data from peer-reviewed journals.

MK-677 vs injectable GH

The oral alternative to growth hormone injections.

MK-677 stimulates your body's own GH production rather than replacing it with exogenous hormone. The trade-offs are different from injectable HGH.

FeatureInjectable HGHMK-677 (ibutamoren)
AdministrationDaily subcutaneous injectionOral — capsule or tablet
MechanismExogenous GH replacementStimulates endogenous GH release via ghrelin receptor
GH patternSupraphysiological peak then clearancePulsatile (natural pattern) over 24 hours
IGF-1 increaseSignificant, dose-dependentModerate, sustained
Prescription statusFDA-approved (limited indications)Not FDA-approved — research compound
Monthly cost$500–$3,000+$50–$150 (research / compounded)
Half-life2–3 hours (GH clearance)4–6 hours (effect lasts 24h)
Shutdown riskSuppresses natural GH productionStimulates natural production (no shutdown)

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