Cytidine is primarily used in research and pharmaceutical applications, particularly in the study of nucleic acid metabolism and RNA synthesis. It serves as a building block for RNA and is involved in various cellular processes, including energy transfer and signaling pathways. In medicine, cytidine analogs are used in antiviral and anticancer therapies, where they interfere with viral replication or inhibit tumor growth. It is also used in combination with other nucleosides to support neurological health and is being studied for potential benefits in cognitive disorders. Additionally, cytidine is used in cosmetic formulations for its skin-conditioning properties, helping to improve skin appearance and repair barrier function.