Skin Tightener and Dermal Stimulator, this nourishing lotion targets loose, sagging skin on the body that has become fragile, thin, and finely wrinkled like crepe paper. It is designed to help smooth skin surface and give appearance of tighter, younger looking skin. Crepey skin is most common on the upper inner arms. Causes include aging, lack of moisture, excessive weight loss, and sun damage. This product provides nutrients to sub-dermal cells that have been shown in published laboratory cell research to encourage natural synthesis of tropoelastin monomers, (the building blocks of new elastin).What is elastin? Elastin is the protein fiber in skin that is elastic and allows the skin to resume shape after stretching or contracting. Elastin depletes with age as the fibroblast cells stop making replacement elastin unless stimulated, resulting in wrinkled or stretched out skin. The elastin molecule itself is too large to pass through the outer skin layer, so it must be made within. ReJuviance transdermal carrier technology helps deliver the elastin-stimulating nutrients to the sub-dermal fibroblast cells, prompting them to make replacement elastin where it is needed. This product includes ceramides to reseal hydration lost by droopy skin and includes NAD+ to fuel the cell’s mitochondria, providing cellular energy to do the needed repair work.