Collagen not only has an effect on the skin and joints, but also plays an important role in the hair. Let's read the following article to learn about the effects of collagen on hair. Collagen is a form of protein in the human body. Collagen helps build tendons, ligaments and skin. Therefore, collagen plays a huge role in the muscle and joint system. However, few people know that collagen also has an effect on hair. Through this article, you will know clearly the effects of collagen on hair. 1. What are the effects of collagen on hair? Collagen brings many...