The text says yes. Also the text says other studies supposedly shown decrease in lifespan in humans: "but the conclusion of this study was that supplementation

The text says yes. Also the text says other studies supposedly shown decrease in lifespan in humans: "but the conclusion of this study was that supplementation with vitamin C depressed lifespan, probably by inhibiting production of the body’s native antioxidants, including glutathione and SOD=superoxide dismutase."