MK 677 is an oral SARM that works by increasing the production and release of Growth Hormone from the pituitary gland at the back of the brain.
Increased production of Growth Hormone+More release of Growth Hormone=More circulating and available Growth Hormone=More Growth Hormone for muscle growth.
It will increase your appetite quite a lot, because your body is being told to repair and grow, so best used for a recomp or lean bulking cycle.
It can be used on it's own but is best stacked with a Test Base to combat the possible lethargy side effects.