A team of US researchers has developed a new biodegradable material with built-in vitamin A which has been shown to reduce scarring in blood vessels. While scarring is a natural part of any healing process scar formation within our blood vessels can be deadly. When injury occurs cells proliferate and migrate into the blood vessel creating scar-like tissue. It can create blockages that impair blood flow said lead researcher Guillermo Ameer from the Northwestern University. The soft elastic material can be used to treat injured vessels or be used to make medical devices such as stents and prosthetic vascular grafts.