Lysine

An amino acid that plays a role in collagen production and skin repair. Lysine, as an essential amino acid, primarily functions as a humectant in cosmetic formulations, attracting and retaining water in the stratum corneum to enhance skin hydration and support barrier function. It is a fundamental building block for proteins like collagen and elastin, contributing to the skin's structural integrity. Additionally, lysine can be incorporated into peptides that may act as signaling molecules, potentially aiding in skin repair processes and contributing to overall skin health.

Lysine is an essential amino acid naturally present in the skin and generally recognized as safe for topical use. The CIR Expert Panel has concluded that amino acids, including Lysine, are safe as cosmetic ingredients. It exhibits a very low potential for skin irritation or sensitization.

Look for products with 0.1-5% (most commonly found in complex amino acid blends or NMF-mimicking formulations; individual lysine concentration often ranges from 0.1-1%) for clinical efficacy.