Harnessing the power of plant stem cell extracts and acetyl tetrapeptide inside Multi Stem Cell Skin Tightening Complex, this advanced serum provides key ingredients to help improve the appearance of aging skin. Our complex has the essential ingredients to better looking tone skin. Acetyl tetrapeptide-2 enhances skin cohesion and hydration by promoting production of collagen and elastin, while the plant stem cell extracts and their respective metabolites work to nourish existing collagen and elastin fibers from environmental exposure.