Pure Encapsulations Buffered Ascorbic Acid - 30 Capsules | Pure Encapsulations Gentle Vitamin CBuffered Ascorbic Acid combines calcium ascorbate, magnesium ascorbate, and potassium ascorbate to create a neutral pH vitamin C for sensitive individuals. Vitamin C contributes to normal psychological function and functioning of the nervous system. Vitamin C contributes to the reduction of tiredness and fatigue.