MK-677 is a secretagogue of growth hormone; a substance that causes more growth hormone and IGF-1 to be excreted in your body. It does this by imitating ghrelin, binding to ghrelin receptors in the brain and stimulating your natural production of GH and IGF-1. The use of Ibutamores increases the body’s own levels of these anabolic hormones without disturbing other hormones such as testosterone or cortisol. This means that it is safe for long-term use and does not require any form of PCT.