It is collagen that gives the skin its firmness. One can imagine collagen as stretchy fibers that pull the skin back to its original shape when it has been stretched out. One can also imagine that with repeated stretching, the fibers might wear out or dry out. When this happens, the skin can begin to sag, and this leads to the formation of wrinkles.
Research has shown that there is a natural substance called hyaluronic acid, which nourishes and protects the collagen. It does this by binding with up to 1000 times its weight in water. But hyaluronic acid levels drop as one gets older. So less water is bound to the collagen and it dries out. The Youth Regenerating Moisturizer also contains Vitamin C, which has been shown to boost healthy collagen production.