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Tripeptide-10 Citrulline is a bioactive peptide widely used in cosmetic formulations for its anti-aging properties, ability to optimize collagen fiber organization, enhance skin elasticity and firmness, and improve overall skin quality. It functions by mimicking the effects of decorin, a core protein polysaccharide, to regulate the formation of collagen fibrils, maintain appropriate spacing between fibrils, and stabilize them within the tissue, resulting in improved skin hydration, softness, and a reduction in the visible signs of aging.