Supporting the skin, bone, cartilage and blood vessels, collagen is the main protein of the connective tisue. Composing up 80 percent of the skin, the role of collagen is to maintain the skin's integrity, but collagen breaks down with advancing age. The breakdown of collagen during the aging process can lead to wrinkles, lines and folds. Collagen injections replenish the skin's natural collagen. In 2007, there were 174,290 collagen injections performed in the United States, down about 70 percent from 2000, according to statistics compiled by the American Society of Plastic Surgeons.
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