Fetal Bovine Serum (FBS), Tetracycline Negative is widely used in eukaryotic cell culture, typically as a supplement for growth media. Fetal bovine serum contains nutritional and embryonic growth promoting factors that are essential for a successful cell culture. Further, fetal bovine serum contains various small molecules, such as, e.g., amino acids, lipids, sugars, and hormones. Fetal bovine serum (FBS) is the blood component obtained after coagulation and removal of cellular components. Its unique and comprehensive mix makes FBS one of the most important supplements for supporting cell growth and proliferation for in vitro cell culture. Our fetal bovine serum for cell culture supports most cell lines and undergoes strict quality controls. This product is collected in South America. Cell culture applications with tet-inducible gene expression systems and other applications, where the presence of tetracycline would be disturbing, require the use of a tetracycline-negative FBS. Capricorn Scientific has established a test with an external laboratory, using liquid chromatography-tandem mass spectroscopy to detect all kinds of tetracycline. This method allows accurate detection of Chlortetracycline and Oxytetracycline in a range of 0.05 mg/l.