MK-677 liquid (commonly known as Nutrobal or Ibutamoren) is an orally administered growth hormone secretagogue that is designed to stimulate the pituitary gland to release growth hormone. MK-677 works by targeting specific androgen receptors and alters the way they function in the body.

MK-677 liquid has been shown to promote an increase in lean body mass as well as a boost in IGF-1 serum concentration during clinical runs. It is considered as game changers in the world of fitness and in pharmaceutical science.