Phosphocholine chloride sodium salt hydrate is widely used in biochemical research and medical applications. It serves as a key component in the synthesis of phospholipids, which are essential for cell membrane structure and function. This compound is also utilized in the development of liposomes, which are employed as drug delivery systems to enhance the targeted delivery of therapeutic agents. Additionally, it plays a role in studying signal transduction pathways and cellular communication, making it valuable in understanding various physiological and pathological processes. Its application extends to the field of immunology, where it is used to investigate immune responses and develop vaccines.