Collagen creams regularly used in cosmetic rejuvenation therapy as an anti-aging products help to keep skin youthful and vibrant. As women get older (over 40) they lose up to 30 percent of the collagen in their body. This process leads to the development of crow"s feet, wrinkles and saggy skin. Collagen creams can help to slow down the process of wrinkling and ageing skin and could possibly even halt the process, at least for a while, leaving skin fresh and younger. Night cream, anti wrinkle cream and face masks are all known to contain collagen as their main active ingredient. Creams which use collagen work by replacing some of the collagen which is lost as we get older. Some collagen creams also help to stimulate the body into producing more collagen, thus improving the skin and lessening the effects of the ageing process on the face and body.