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When injected, it works temporarily to smooth out wrinkles. Not only is the benefit temporary, it can actually make your skin look worse after the effect wears off.

Your skin is an organ that naturally rejuvenates throughout your life. As you get older, there is less rejuvenation going on.

The body produces collagen, elastin and other proteins that help to maintain the skin's elasticity. As the production of those proteins slows down, the skin becomes less elastic.
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It is the skin's elasticity that causes it to snap back when pulled. During a gradual weight gain the skin stretches out and can return to normal when the weight is loss; during pregnancy for example.
If the weight gain is sudden or the skin is not in good health, stretch marks will appear due to tearing in the dermis layer, the location of the elastic fibers.

There are some natural compounds that fade stretch marks and other scars. They work on wrinkles, too. But, back to what happens when collagen is injected as deep wrinkle filler.
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The collagen is injected into the fatty tissue layer to simulate a sudden weight gain. It is not enough of a gain to cause stretch marks, but it does make your face look fatter.

The collagen will gradually be broken down by the body and disposed of through the lymphatic system. Since the skin is older, it is less elastic. So, it does not "snap back" after the collagen deteriorates.

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