When sourcing Cephalosporin API Sodium, the most critical requirement is compliance with GMP (Good Manufacturing Practice) standards. Buyers must ensure the manufacturer holds a valid CEP (Certificate of Suitability to the Monographs of the European Pharmacopoeia) or a DMF (Drug Master File) registration. The product must strictly adhere to international pharmacopoeia standards such as USP (United States Pharmacopeia), BP (British Pharmacopeia), or EP (European Pharmacopoeia) to ensure chemical purity, potency, and safety.