Decapeptide-4 is a synthetic peptide that plays a significant role in skin care due to its ability to mimic the Somatomedin growth factor, which is involved in normal skin growth, healing, and wound repair. Composed of arginine, aspartic acid, cysteine, glutamic acid, leucine, methionine, and tyrosine, this peptide can penetrate the dermis to increase collagen production. It works by stimulating the synthesis of collagen (types I, II, and IV), elastin, and hyaluronic acid, which are essential for skin elasticity and hydration. Decapeptide-4 helps to reverse the aging process of the skin from the inside out, enhancing the skin's moisture content and water retention, increasing skin thickness, and reducing fine lines. It is widely used in anti-aging and skin-quality-improving cosmetics, often incorporated into facial, neck, and hand care products, as well as various skincare formulations such as lotions, creams, and eye serums.