There have been several allegations that Human Growth Hormone can be an effective tool for reducing obesity and guaranteed effective weight loss. However, no specific studies have been made yet on this fact. All these requirements are usually based on the fact that HGH occurs naturally in the body and secreted by the pituitary gland. They only say that as we age the pituitary gland produces less and less HGH, and thus slowing the basic functions of the body, particularly its metabolism.