Used primarily as a source of methionine in animal feed, especially in poultry and swine nutrition. It supports protein synthesis, improves feed efficiency, and promotes growth and feathering in birds. The calcium salt form is stable and less hygroscopic, making it suitable for pelleting and long-term storage in feed production. Also contributes to antioxidant defenses through sulfur-containing compounds. Commonly used in ruminant diets where bypass protein and rumen-protected amino acids are needed to optimize milk production and nitrogen utilization.