When sourcing pharmaceutical tablets, the most critical requirement is GMP (Good Manufacturing Practice) certification, which ensures products are consistently produced and controlled according to quality standards. Additionally, look for ISO 13485 for medical-related devices or ISO 9001 for general quality management. For specific markets, verify if the manufacturer has FDA (USA), EMA (Europe), or NMPA (China) approvals. Always request a Certificate of Analysis (COA) for every batch to verify the chemical composition and purity.