Fetal Bovine Serum (FBS) is a sterile, light brown-colored liquid separated from the blood of the bovine fetus. All material meets the approval of the U.S. Department of Agriculture and is obtained from sources free of BSE, Foot and Mouth Disease, and other reportable diseases pertaining to the species. Mediatech offers two types of FBS: U.S.-Sourced: Our U.S.-sourced Premium Fetal Bovine Serum, with the lowest endotoxin and hemoglobin specifications, is collected from cattle herds only within the Undited States. Also available heat-inactivated.