Bovine Serum Albumin (also known as BSA) is a serum albumin protein derived from bovine blood. It is purified and fractionated through a specific heat-shock procedure, followed by extensive diafiltration and ion-exchange to remove other plasma proteins, lipids, and extraneous ions. BSA Fatty Acid Free has extremely low levels of total lipids and fatty acids, which makes it suitable for various applications in which lipids and fatty acids may interfere. BSA has numerous biochemical applications, including ELISAs (Enzyme-Linked Immunosorbent Assay), immunoblots, and immunohistochemistry. It is also used as a stabilizer and cell growth supplement for cell and microbial cultures.