The hgH Fragment is a modified form of amino acids 176-191 of the human growth hormone (GH) polypeptide. Investigators at Monash University discovered that the fat-reducing effects of GH appear to be controlled by a small region near one end of the GH molecule. This region, which consists of amino acids 176-191, is less than 10% of the total size of the GH molecule and appears to have no effect on growth or insulin resistance. It works by mimicking the way natural Growth Hormone regulates fat metabolism but without the adverse effects on blood sugar or growth that is seen with unmodified Growth Hormone. Like Growth Hormone, the hgH fragment 176-191 stimulates lipolysis (the breakdown or destruction of fat) and inhibits lipogenesis (the transformation of nonfat food materials into body fat) both in laboratory testing and in animals and humans.

In laboratory tests on fat cells from rodents, pigs, dogs, and humans, the hgH fragment released fat specifically from obese fat cells but not from lean ones, reduced new fat accumulation in all fat cells, enhanced the burning of fat. In rodents (rats and mice), hgH fragment reduced body fat in obese animals but, enhanced fat burning without changing food consumption or inducing growth (as it does not increase IGF levels) or any other unwanted Growth ​