Threonine, an essential amino acid, must be acquired through dietary sources as our bodies cannot produce it naturally. It serves as a fundamental building block for proteins and plays a pivotal role in numerous physiological functions, particularly in skin health. Threonine’s involvement in collagen synthesis is vital for the maintenance and repair of skin tissues. Additionally, it serves as a precursor for glycine and serine, essential amino acids crucial for synthesizing phospholipids. These phospholipids are integral components of skin cell membranes, preserving their integrity and safeguarding against external factors.