Collagen is a tough, glue-like protein that represents 30% of body protein. It shapes the structure of tendons, bones, and connective tissues. Problems with the immune system can affect these structures. This is known as collagen vascular disease.
Review Date: 6/18/2007 Reviewed By: Steve Lee, DO, Rheumatology Fellow, Loma Linda University Medical Center, Loma Linda, CA. Review provided by VeriMed Healthcare Network.