Fetal Bovine Sera sourced from the United States is collected exclusively from USDA licensed abattoirs from within the United States. Raw material is processed through 0.1 µm (100nm) filters in compliance with regulatory guidelines. Animals are inspected pre-mortem and post-mortem by USDA veterinarians as free of any infectious diseases. Serum is maintained between 4-6°F after collection through sterile filling to ensure exceptional performance.