Peptide is an indispensable small molecular substance in the connection of protein and amino acid. Usually, peptide has many functions and effects in the human body, and is an indispensable tissue component of the human body. Generally, peptides can regulate the nutrition and immunity of the human body. They can usually regulate the immune function of the human body and increase the immune barrier of the human body and the efficacy of cellular immunity and humoral immunity of the human body. In addition, peptides can also regulate the cholesterol metabolism of the human body. For example, when the human body is deficient in cholesterol or peptides, the metabolism of cholesterol in the body will be impaired. Peptides can also regulate the body's hormone secretion and endocrine secretion state. If there is a lack of peptides in the body, it will lead to endocrine imbalances and endocrine disorders.