Ibutamoren (also known as ibutamoren mesylate or MK-677), promotes the secretion of the growth hormone (GH) and increases insulin-like growth factor 1 (IGF-1)
Ibutamoren increases levels, by mimicking the action of the hormone ghrelin, and binding to one of the ghrelin receptors in the brain. Activated ghrelin receptors stimulates growth hormone release from the brain.