Mk677 (Ibutamoren) is a potent growth hormone secretagogue that stimulates the release of growth hormone and insulin-like growth factor 1 (IGF-1). This supplement is popular among athletes and bodybuilders for its ability to promote muscle growth, enhance fat loss, and improve recovery times. Additionally, Mk677 is known for its positive effects on sleep quality and overall well-being, making it an essential addition to any fitness regimen.