Peptide hormones are a unique class of hormones that are composed of short chains of amino acids, typically ranging from 2 to 50 amino acids in length. Peptides come in various forms, and peptides growth hormone is an example of peptide hormones that has gained significant attention. Unlike steroid hormones, which are lipid-soluble and can freely diffuse across cell membranes, peptide hormones are water-soluble and interact with specific receptors on the surface of target cells. When a peptide hormone binds to its receptor, it triggers a cascade of intracellular signalling events that ultimately lead to the desired physiological response, such as the regulation of growth, development, metabolism, or reproduction.