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From a chemical point of view, the peptide is an organic chemical compound that is formed by the compounding of several amino acids. The individual bonded amino acids (in a sequence called successive sequence) are joined by the so-called & quot; amide bond, to a single unbranched peptide chain. Due to the great importance of peptides in biochemistry and organic chemistry, this binding is often referred to as a peptide bond. As peptides, we refer to relatively short amino acid chains with 50 (generally not more than 100) amino acids. Peptides differ from proteins (proteins) only by their size (the number of amino acids contained in the chain), the separation between peptides and proteins is not entirely unambiguous and is determined by an agreement in which 100 amino acids are considered beyond the boundary. The naturally occurring peptides are mostly formed by a protein biosynthesis process. The sequence information itself (amino acid sequence) is encoded in DNA. Peptides fill a large number of important and irreplaceable functions in the body. Peptide hormones and neuropeptides regulate most processes in the human body.