The whey protein market is reactivating after the quiet summer period in week 28 (September 16), amid bearish sentiment and renewed trading activity in Europe. WPC80 and WPI90 benchmarks declined to their lowest levels since May, while elevated whey protein prices are increasing the attractiveness of MPC as an alternative protein source. In the United States, WPI 90 prices showed greater resilience, resulting in a different production response compared with the European market.