Vitamin C is an essential vitamin and a powerful antioxidant that can strengthen your body’s defenses. Vitamin C has been shown to reduce the severity and duration of the common cold as well as provide a significant boost to immune function. Vitamin C has been associated with lower risk of heart disease, healthier blood pressure, and may even protect memory function and thinking during aging.Nutricost Vitamin C Unflavored 8.1 oz (227 g) is a pure ascorbic acid powder supplement that provides 1 gram of vitamin C per single-scoop serving.