FBS, or Fetal Bovine Serum, is a common supplement used in cell culture and laboratory research. It is derived from the blood of bovine fetuses and contains a variety of growth factors, hormones, and nutrients that support the growth and maintenance of cells in vitro. Researchers often use FBS to enhance the proliferation and viability of various cell types. Due to its rich composition, FBS is widely utilized in the fields of biotechnology, pharmaceuticals, and tissue engineering. However, ethical concerns regarding animal welfare and the sourcing of FBS have led to the development of alternative serum-free media, which aim to reduce reliance on animal products in scientific research.