Optimal Vitamin C Powder by Seeking Health provides over 2,500 mg of buffered vitamin C in a great-tasting effervescent powder. This important antioxidant may help support the immune system, healthy connective tissue and skin and normal levels of glutathione within the body. As an antioxidant, vitamin C may protect cells from the damage caused by free radicals. Free radicals are compounds formed as normal products of metabolism and in response to environmental exposures. We are exposed to free radicals each day in the environment from cigarette smoke, air pollution, and ultraviolet light from the sun. In addition to supporting the body's healthy response to these exposures, the body also needs vitamin C to make collagen, a protein required to help wounds heal.