Decapeptide-4 can penetrate the dermis and increase collagen, reversing the aging process by rebuilding from the inside out, stimulating collagen, elastin fibers and hyaluronic acid proliferation, increasing moisture content and locking in moisture, increasing skin thickness and reducing fine lines. Decapeptide-4 penetrates the dermis, stimulates collagen and elastin synthesis, and reverses the process of skin aging by rebuilding from the inside out. It also stimulates the proliferation of collagen, elastin fibers and hyaluronic acid, improves the skin's moisture content and moisturizing power, and increases the skin's antibodies to keep sensitive skin insensitive.