MK-677 is a small molecule that stimulates the production of human growth hormone (hGH) and insulin-like growth factor 1 (IGF-1). The effects of MK-677 are similar to peptides that increase hGH levels, but MK-677 can be taken orally as a powder, tablet or liquid, whereas peptides need to be injected.
The increases in hGH and IGF-1 levels cause changes in body composition, such as muscle growth, but these gains aren't permanent, and effects wear off when people stop taking the drug. The health effects of long-term use of MK-677 have not been investigated, and they should not be assumed to be safe.
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