Beta carotene is considered an antioxidant for properties that protect from, and induce the breakdown of, free radical reactions in plants and animals. Beta carotene increases resistance to various environmental influences, in other words, helps to protect skin from environmental damage such as pollution. The human body converts beta-carotene into Vitamin A, which is essential for healthy skin and good vision.
Int J Biochem Cell Biol. 1996 Aug;28(8):935-41.