- Ibutamoren, better known by researchers as MK 677 or nutrobal is a human growth hormone secretagogue. According to current research, MK 677 engages with the pituitary gland to promote the secretion of HGH. By doing so, the body can build lean muscle mass and improve the healing of bones and ligaments. In addition to its ability to release HGH, research found that MK-677 can also slow the release of somatostatin, a hormone tasked with the regulation of human growth hormone.
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