Human Growth hormone (HGH) serves important roles in adult life, including maintenance of lean body mass and bone mass, promoting lipolysis, thereby limiting visceral adiposity, and regulating carbohydrate metabolism, cardiovascular system function, aerobic exercise capacity, and cognitive function.  HGH drops as we age and all the physiological processes regulated by HGH also slow down. This results in the slowing of our metabolic rate, the accumulation of visceral fat, central obesity, frail bones, decrease in physical capacity, strength and endurance and the beginning of cardiovascular diseases- all observed in the ageing human body.While scientific discoveries are yet to take place to establish a more solid link between the decrease in Growth Hormone and ageing, some studies have demonstrated that replacing or stimulating growth hormone may reverse some of the detrimental features of the ageing process.https://www.ncbi.nlm.nih.gov/books/NBK279163/https://pubmed.ncbi.nlm.nih.gov/9779515/