Arginine/Lysine Polypeptide

Arginine/lysine polypeptide is a short-chain protein fragment composed of amino acids—specifically arginine and lysine—that are building blocks naturally found in skin. This ingredient is created through the breakdown of larger proteins into smaller peptide chains, making them small enough to penetrate the skin's outer layers.

In skincare formulations, it functions as a skin conditioning agent, working to support the skin's natural moisture retention and structural integrity. Peptides like this one are used because they mimic components of collagen and elastin, the proteins responsible for skin firmness and elasticity.

Arginine and lysine are amino acids that play key roles in collagen synthesis and skin structure. When delivered as a polypeptide, they can penetrate the outer skin layers and provide raw material for the skin's natural protein production processes.

The mechanism relies on the skin recognising these amino acid building blocks and incorporating them into its own structural proteins. This supports the skin's natural repair and maintenance functions, particularly important as collagen naturally degrades over time.

This ingredient works best as part of a multi-step routine. Apply to cleansed skin morning and evening, or according to product instructions. Since peptides work gradually to support skin structure, consistent use over weeks is more beneficial than intermittent application. Layer with hydrating ingredients like hyaluronic acid to enhance moisture retention.