Z-Orn-OH is primarily utilized in peptide synthesis as a building block for creating custom peptides. It is often employed in the development of pharmaceuticals and biochemical research, where specific peptide sequences are required for studying biological processes or designing therapeutic agents. Its unique structure allows for the incorporation of ornithine, an amino acid not directly encoded by the genetic code, into peptide chains, enabling the exploration of novel peptide-based drugs or bioactive molecules. Additionally, it is used in the preparation of peptide hormones, enzyme inhibitors, and other biologically active compounds, contributing to advancements in medical and biochemical fields.