21-Hydroxy Heneicosanoic Acid Methyl Ester finds application in the field of organic synthesis and chemical research. It is often utilized as an intermediate in the production of complex organic compounds, particularly in the synthesis of specialized lipids and fatty acid derivatives. Its hydroxyl group makes it a valuable building block for creating molecules with specific functional properties, such as surfactants or emulsifiers. Additionally, it is used in the development of bio-based materials and in studies related to lipid metabolism and membrane biochemistry. Its ester group also allows for further chemical modifications, making it versatile in pharmaceutical and cosmetic formulations.