Threonine

Threonine is an amino acid; in other words, it cannot be synthesized by the organism and has to be supplied through nutrition. It is a very important amino acid, as it forms the basic raw material for the synthesis of structural proteins like collagen and elastin, which are crucial for skin strength and elasticity. These proteins form the backbone of healthy, resilient skin that contributes to its smooth, youthful appearance.
Threonine serves to help with general body functions upon ingestion. It enhances the proper functioning of the digestive system and intestines, which improves nutrient absorption and indirectly benefits the skin, due to the effective absorption and utilization of nutritional factors that play an important role in skin repair and regeneration.
In skincare, threonine is incorporated as a humectant to help retain skin moisture. Threonine provides soft, hydrated skin by improving the skin's moisture barrier, which is an essential element for smooth, supple skin. Its incorporation in collagen and elastin production made it also valuable in anti-aging formulations because of its skin firming and fine line-reducing action. In addition, threonine could contribute to the development of better skin repair mechanisms and, thus, can be recommended for products positioned for skin health and hydration.