Collagen and elastin are the two proteins in your skin that are taking care to keep your skin firm and wrinkle free. When you grow older or even when you are under a lot of stress, these two proteins are depleted to a low level. 1. trauma episode 2 2. lie to me season 2 episode 3 3. castle season 2 episode 4 4. three rivers episode 3 5. american dad season 5 episode 3 6. naruto shippuden 130 7. how i met your mother season 5 episode 4 8. csi miami season 8 episode 4