1. Beta Carotene
Beta carotene is an antioxidant that converts to vitamin A in the body. You need vitamin A to maintain a robust immune system, healthy eyes, and clear skin. Get your fill through a diet rich in things like sweet potatoes, green peppers, and carrots (though this will not improve your night vision, contrary to popular belief).
One note of caution, though – taking in too much beta carotene in the form of supplements could up your risk of certain cancers and lung disease, especially if you’re a smoker. There is no set RDA for beta-carotene, only for vitamin A (3,000 IU for men and 2,300 IU for women). That can make it tough to select the right strength supplement.