Etat Pur Peptide-4 Pro-Collagen 15 ml is a concentrated anti-aging treatment designed to stimulate collagen production, improve firmness, and smooth early fine lines. The formula is built around a bio-identical tetrapeptide (Peptide-4), which mimics the skin’s natural signaling molecules to boost collagen synthesis and reinforce the dermal structure. This “pure active” is intended to be used as a targeted collagen-boosting step before moisturizer to help improve elasticity, firmness, and skin smoothness over time.