Ibutamoren is an oral growth hormone-releasing peptide (GHRP). Unlike Ipamorelin, it's taken by mouth and remains active for roughly 24 hours. MK-677 increases growth hormone levels, energy, lean muscle mass, and strength resulting in improved sleep & muscle recovery. It can also help decrease fat by stimulating the production of insulin-like growth factor (IGF-1). MK-677 works by stimulating the pituitary gland which results in increased growth hormone production. Over time, the body repairs itself, and the aging process is slowed down. MK-677 also increases ghrelin, the "hunger hormone." This side effect tends to lessen when taken at bedtime.