Younger: Pure Youth Serum works by helping skin complete two key processes: collagen and elastin synthesis and the creation of new skin cells. These vital functions are managed by signals sent to retinoid receptors- protein molecules on the surface of the cell membrane that initiate a biological response. When the skin''s retinoid receptors are activated, it responds by creating collagen, elastic fibers, and new skin cells. With age, these receptors become less active, and collagen production and cell turnover slows. 1 oz. Made in USA.Style code: 0419040237534