Antioxidant cycling is the term that describes how antioxidants work together to extend each others' lives and make each other more powerful. When the antioxidant vitamin E disables free radicals, it becomes a minor free radical. However, when vitamin C recycles vitamin E, it changes to a free radical. Glutathione not only recycles vitamin C, but is the cells' primary antioxidant. Glutathione diminishes as we age and cannot be boosted significantly through supplements.
Selenium is part of the enzyme glutathione peroxidase, which recycles glutathione.
OPCs also play a role in cycling as they sacrifice themselves in order to neutralize harmful free radicals within the body. Take 2 capsules per day. Best taken with meals. Shelf life is 2 years, sealed. Do not refrigerate.