Collagen is mentioned a lot in health care and beauty. So what is collagen? What are the effects of collagen? Following article to find more information. 1. What is collagen? Collagen is the protein that makes up connective tissues. The body can naturally produce about 25 different types of collagen. They make up 25% of the total protein in the human body. Collagen plays an important role in keeping skin healthy and elastic, supporting bones, ligaments, muscles, cartilage as well as internal organs. Collagen is divided into 4 types as follows: Type I : Makes up 90% of collagen in...