DL-Threonine is primarily used as a nutritional supplement in animal feed, particularly for poultry, swine, and aquaculture, to ensure balanced amino acid profiles for optimal growth and health. It plays a crucial role in protein synthesis and supports immune function in livestock. In the pharmaceutical industry, it is utilized in the formulation of amino acid infusions and dietary supplements for humans, especially in cases of malnutrition or recovery from illness. Additionally, DL-Threonine is employed in microbiological research as a component of culture media to study microbial growth and metabolism. Its applications extend to the cosmetic industry, where it is incorporated into skincare products for its moisturizing and skin-repairing properties.