Z firming serum is clinically proven to deliver equivalent results to one injection of collagen filler in just two weeks of regular use. Advanced formula contains a combination of copper proline, lysine, hyaluronic acid and niacinmide. This unique combination of multiple active ingredients reactivates collagen 1, collagen 3 and elastin production. Delivers a decrease in skin laxity of 50% after four weeks. 1 fl oz.