Vitamin C, ascorbic acid, is a water-soluble substance found in citrus fruits and green vegetables. An important antioxidant, vitamin C protects the body from free radicals and fights oxidative stress, both of which threaten the immune system. In fact, a major immune-supporting activity of vitamin C is boosting glutathione levels in human lympho-cytes, cells that make up about 25% of all white blood cells in the blood
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