L-Proline is an amino acid, which along with Vitamin C is responsible for the production of collagen. It also plays an important role in blood vessel and artery health by keeping them supple and elastic, reducing the buildup of fat on artery walls, therefore reducing risks associated with arteriosclerosis. Proline is also important for healthy, elastic skin and tissue repair/ wound healing. visit us : http://www.tasmanhealth.co.nz/l-proline-powder/ for more details!!