In today’s volatile sera market, it is critical that sera users worldwide thoroughly review their supply relationships and update sourcing and risk mitigation strategies. BioProcessing Journal’s recent article by Siegel and Foster highlighted the impact of selecting the appropriate country of origin as one criterion for purchasing decisions. Many more vital selection criteria exist to ensure a sera supplier provides long-term assurance of supply and integrity of supply. This article identifies critical questions sera users should ask their suppliers and explains why they should ask them…