CMC, or carboxymethyl cellulose, is a cellulose-based thickener, stabilizer, and water-binding ingredient used in food, pharmaceutical, cosmetic, and industrial applications. It helps improve viscosity, suspension, mouthfeel, and texture stability. For manufacturers, choosing the right CMC grade is important because viscosity, substitution degree, hydration behavior, and compatibility with pH, salts, and process conditions can strongly affect final product performance.