How about metabolism?
Growth hormone has important effects on:
Protein metabolism: HGH causes increased amino acid uptake, increased protein synthesis and decreased oxidation of proteins.
Fat metabolism: HGH enhances the utilization of fat -- gives your body the ability to break down fat cells more efficiently.
Carbohydrate metabolism: HGH is one of several hormones that maintain blood sugar within a normal range.
Without HGH …
Because of the abilities of HGH mentioned above, you can soon see that without it, muscle tone declines, fat stubbornly sits in the body and resists metabolism, and hair, skin and nails (all composed of proteins) deteriorate. In fact, scientists now believe that HGH has a role in most healthy functions of the body, including sexual function, proper operation of stomach and bowels, liver, and all glandular systems.
Whether HGH is directly interacting with certain cells, or playing its key part in the correct function of other bodily systems, it's essential throughout the body for youthful vigor and health!