Sambucol is a unique black elderberry extract rich in immune supporting flavonoids. Flavonoids are powerful, natural antioxidants that are thought to work to protect the body's cells from the potential damage caused by free radicals. Certain flavonoids – anthocyanins – are found primarily in the pigments of dark blue and deep purple fruits such as the black elderberry. It is these that have a remarkable ability to stimulate the body's immune system. According to the United States Department of Agriculture, the highest concentration of anthocyanins are found in black elderberries – nearly double the amount found in any other fruit. The presence of these anthocyanins, gives black elderberries twice the natural antioxidant capacity of blueberries and significantly more than cranberries. Color: Multicolor.