Vitamin C is an antioxidant essential for collagen and connective tissue production and immune function. In particular, vitamin C promotes increased natural killer cell and white blood cell activity. Several Metagenics vitamin C formulas feature Ester-C®—a patented, non-acidic complex of vitamin C, essential minerals, and vitamin C metabolites. Ester-C does not cause the stomach and digestive problems of regular vitamin C. Furthermore, preliminary research suggests that Metagenics line of Ultra-Potent C® products may result in improved uptake by white blood cells when compared to regular vitamin C.

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