Studies in the American Journal of Clinical Nutrition indicate that these are better absorbed and retained than the synthetic vitamin. Although magnesium is not an antioxidant, it tends to be low in men who have heart attacks. Vitamin C can be obtained from citrus, tropical fruits, melons, berries, peppers, broccoli. RDA for an adult male or female is 400 micrograms per day. At-risk populations may need to take Vitamin C and E and folic acid supplements, since it's hard to get a sufficient amount in the normal diet.
Selenium is present in seafood, cereals, meats, whole grains and brazil nuts.
As a supplement, avoid taking more than 200 micrograms per day unless specifically instructed by your health professional. Zinc can be found in oysters, whole grains, seafood and organ meats. Carotenoids and other phytochemical antioxidants can be obtained from sweet potatoes, papaya, apricots, and dark yellow and green vegetables. Coenzyme Q-10 is found in eggs, rice bran and wheat germ. L-carnitine is a nutrient that is produced by the body.