CRM197 Protein—a non-toxic mutant of diphtheria toxin—is the critical carrier protein for glycoconjugate vaccines and a rising reagent in targeted cancer immunotherapies. Global CRM197 Protein market size is estimated at US$ 235 million in 2025, underpinned by accelerating demand for multivalent pneumococcal and meningococcal vaccines and a robust pipeline of neoantigen-based cancer vaccines. Analysts project a 13–15% CAGR through 2033, positioning the sector at ~US$ 630 million by the end of the forecast window, with volume growth outpacing value due to gradual price erosion as biosimilar carriers enter. The growth outlook is anchored on three macro drivers: expanding national immunization programs in lower-middle-income countries, tightening WHO/PIC/S cGMP standards that favor high-purity, CRM197-based formulations, and strategic supply contracts that lock in multi-year offtake and insulate producers from cyclical vaccine procurement lulls.