As highlighted in Advances in Experimental Medicine and Biology, amino acids serve as the fundamental building blocks of all proteins, including key fibrous proteins found abundantly in the skin, such as keratins, collagen, and elastin. Features like sagging and wrinkles in the skin are characteristic of chronically sun-damaged and aged skin that lacks proper care, primarily linked to the degradation of collagen and elastin fibers. The preservation of skin structures through self-repair mechanisms is vital for maintaining skin health, underscoring the significant impact of amino acids on skin appearance.