N-Acetylmannosamine is primarily used in the field of biochemistry and medical research. It serves as a key precursor in the biosynthesis of sialic acids, which are critical components of glycoproteins and glycolipids on cell surfaces. These molecules play essential roles in cell-cell communication, immune response, and pathogen recognition. In therapeutic applications, N-Acetylmannosamine is explored for its potential in treating diseases related to sialic acid metabolism, such as certain genetic disorders. Additionally, it is studied for its role in enhancing the efficacy of vaccines and in the development of antiviral drugs, as sialic acids are often involved in viral entry mechanisms. Researchers also utilize it in the synthesis of glycoconjugates for targeted drug delivery systems.