MK-677 Powder 1g

MK-677 Powder, Research Overview

MK-677 (Ibutamoren, L-163,191) is an orally active, non-peptide ghrelin receptor (GHSR-1a) agonist that stimulates pulsatile growth hormone secretion and sustained IGF-1 elevation. Unlike GHRH analogues or GHRPs, MK-677 is orally bioavailable with a long half-life (~24 hours in humans), making it pharmacologically distinct for research into GH axis restoration.

Mechanism of Action

MK-677 mimics the endogenous ghrelin ligand at the GHSR-1a receptor in the hypothalamus and pituitary, stimulating GH release. Unlike exogenous GH, it preserves the pulsatile pattern of GH secretion, which is physiologically important for downstream IGF-1 production, anabolic signalling, and metabolic effects. Chronic administration maintains GH and IGF-1 elevation without pituitary desensitisation in rodent models.

Powder Format for Research

Raw powder is suited for formulation research (oral suspension, solution), in vitro receptor assays, and pharmacokinetic studies. MK-677 is soluble in DMSO (≥50mg/mL) and ethanol. For in vivo rodent studies, it is typically administered in drinking water or oral gavage at 10–25mg/kg/day.

Research Applications

Published research areas include: GH deficiency modelling, sarcopenia and muscle wasting, sleep architecture (MK-677 increases slow-wave sleep duration), bone mineral density, and cognitive performance in IGF-1-sensitive neural circuits.

Purity: ≥98% (HPLC verified) | Format: Lyophilised powder | Quantity: 1g

For research use only. Not for human consumption.