Any nutrients introduced into the human body to enhance health, physical growth, or performance Common supplements are vitamins and minerals, or proteins (in drinks, powders and bars)
pills, liquids, or powders that contain purified nutrients, or foods with purified nutrients added in amounts per serving greater than 50% above a standard considered sufficient for all healthy people
Beta carotene supplements are available in various forms, including synthetic forms and those extracted from algae and palm oil Some studies suggest that those extracted from palm oil are absorbed more efficiently Natural beta carotene may have greater beneficial effects than synthetic forms