Casein acid hydrolysate is widely used in microbiology as a nutrient source in culture media for growing bacteria, fungi, and other microorganisms. It provides essential amino acids and peptides that support microbial growth and metabolism. In the pharmaceutical industry, it serves as a component in formulations for oral rehydration solutions and nutritional supplements due to its digestibility and amino acid profile. Additionally, it is utilized in the food industry as a flavor enhancer and protein supplement in products like soups, sauces, and processed foods. Its application also extends to biotechnology, where it acts as a substrate in enzyme production and fermentation processes.