<prompt> All of the following vitamins are anti-oxidants EXCEPT:Beta- caroteneAscorbic acidVitamin EVitamin K  <response>: Ans. d Vitamin KRef: Harpers Biochemistry, 30th ed. pg. 554-555 Anti-oxidants are vitamin A, C and vitamin E ACE. Most important of all is vitamin E. Free-radicals are formed from exposure to sunlight and pollution and also as a byproduct of cell metabolism. Alcohol, cigarette smoke, stress and even diet also affect the level of free-radical development in the body. Excellent antioxidants include Vitamin A, Vitamin E, Vitamin C, zinc, selenium, ginkgo biloba, grape seed extract, and green tea extract. 