<prompt> Among the following, which is the most effective antioxidant:Vitamin AVitamin CVitamin EVitamin K  <response>: Ans. c Vitamin ERef: Harpers Biochemistry, 30th ed. pg. 553, 564 Vitamin E has many biological functions, the antioxidant function being the most important andor best known. Other functions include: Enzymatic activities Gene expression Neurological function and Cell signaling As an antioxidant, vitamin E acts as a peroxyl radical scavenger, preventing the propagation of free radicals in tissues. It does so by reacting with ROS to form a tocopheryl radical, which will then be reduced by a hydrogen donor such as vitamin C to its reduced state. As it is fat- soluble, it is incorporated into cell membranes, which protects them from oxidative damage. 