Acetyl Tetrapeptide-5 is a synthetic peptide used primarily in eye care formulations to reduce under-eye puffiness, dark circles, and bags. It works by inhibiting angiotensin-converting enzyme (ACE), which helps decrease inflammation and fluid retention in the skin. This leads to improved skin elasticity, firmness, and a reduction in the appearance of fine lines around the eyes. Often incorporated into anti-aging eye creams and serums, it supports the skin's extracellular matrix for better moisture retention and structural integrity. Ideal for sensitive skin types seeking targeted, gentle anti-puffiness benefits.