Anthocyanins

A flavonoid antioxidant that has a more potent capacity to protect cells against damage than the vitamins E or C; it is found in high concentration in the elderberry, fives more than that in blueberries and twice the antioxidant function of cranberries. Elderberry causes few side effects when used in recommended dosages for five days or less, based on the University of Maryland Medical Center. At times, however, for people using it for lengthy intervals, some unwanted effects can happen.