When sourcing pharmaceutical-grade Albendazole, the supplier must strictly adhere to GMP (Good Manufacturing Practice) standards. You should verify if the product complies with international pharmacopoeia standards such as USP (United States Pharmacopeia), BP (British Pharmacopeia), or EP (European Pharmacopoeia). Additionally, ensure the manufacturer holds a valid Certificate of Analysis (COA) for every batch and, ideally, a CEP (Certificate of Suitability) or DMF (Drug Master File) to guarantee the quality of the Active Pharmaceutical Ingredient (API).