dr. berg's vitamin c complex whole food (60 chewable) 100% natural vitamin c from just 4 berries, non-gmo dr. berg’s nutritionals our 100% natural whole vitamin c complex is created from the combination of four nutrient-dense berries: organic freeze-dried acerola cherry fruit, freeze-dried acai berry fruit, organic freeze-dried strawberry fruit, and organic freeze-dried blueberry fruit.