Collagen is produced by cells called fibroblasts. It is part of a large group of proteins. It alone, represents 70% of the proteins in our derme! It is found in the form of fibres in many parts of the body : vital organs, bones, muscles, tendons, skin, blood vessels ... Collagen is responsible for resistance of the tissues, it protects and stabilises skin and cartilage. Along with elastin fibres and glycoproteins, it forms support tissues in the skin. It is the reason why skin is firm and the face has defined contours.