Collagen  :

The most important building block in the entire animal world, collagenis the tie that binds the animal kingdom together.Life is a string of  complex molecules: polymers.Nature's most abundant protein polymer is collagen  more than a third of the body's protein is collagen.Collagen makes up 75% of our skin.Collagen controls cell shape and differentiation, migration, and  the synthesis of a number of proteins. 

      When the body needs to build any new cellular structure as in the healing
      process, collagen and/or collagen fragments will play a central role. 
      Collagen is very important for the skin. Indeed, it is the principal structural 
      protein holding the skin together. The quantity and quality of our skin's collagen
      has a major role in our appearance. Therefore, it may be tempting to think that  
      simply getting more collagen into the skin should lead to dramatic rejuvenating
      effects. While there is a grain of truth to that, things are more complicated than
      they look as far as collagen is concerned.