L-Threonine makes up collagen, elastin, and enamel protein. It aids proper fat metabolism in the liver, helps the digestive and intestinal tracts function more smoothly, and assists in metabolism and assimilation. Active ingredient in parenteral nutrition products as a source of calories, electrolytes and proteins. Pharmaceutical ingredient in therapeutic products that increase the concentration of glycine in the cerebrospinal fluid of patients with spasticity. It is found in products in the form of capsules, tablets or powder for nutritional supplementation.