Normal fetal bovine serum is widely used in cell culture applications as a growth supplement. It provides essential nutrients, hormones, and growth factors that support the proliferation and maintenance of various cell types. This serum is commonly employed in research laboratories for cultivating mammalian cells, including primary cells and cell lines, in studies related to virology, immunology, and cancer research. It is also utilized in the production of vaccines and biopharmaceuticals, where it aids in optimizing cell growth and ensuring consistent experimental conditions. Additionally, it serves as a critical component in diagnostic assays and tissue engineering, helping to create environments that mimic in vivo conditions for accurate results.