Sermorelin is a synthetic growth hormone releasing hormone with 29 amino acid polypeptides, which is an amino-terminal fragment of endogenous growth hormone-releasing hormone (GHRH), which has a significant growth-regulating effect. It is proposed that neuropeptides/neurotransmitters, hormones and cytokines are the "common language" for the mutual regulation of the nervous system, endocrine system and immune system. The immune system is regulated by the neuro-endocrine-immune network, in addition to its own very fine regulatory mechanisms.