These studies were motivated by the significant functions of testosterone and their lasting beneficial effects on muscle mass and strength in hypogonadal treatment [71]. As part of the natural ageing process, older people notice a decline in their levels of human growth hormone (HGH), but this decline may be reversed if HGH supplements are given to them. The precise mechanism by which HGH repairs and delays the formation of sarcopenia is via activating the IGF-1 molecule [24,72]. Here, IGF1 is linked to sarcopenia.