http://www.immunehealthscience.com/glutathione-cofactors.html
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Vitamin C – as an antioxidant it assists glutathione in this function and has been shown scientifically to raise glutathione levels short term; it is recycled by glutathione from its oxidized state back to its active state, thus strengthening antioxidant defenses; vitamin C also recycles vitamin E and alpha lipoic acid.