Cranberries are rich in Vitamin C and are thought to contain antioxidant properties which may help to contribute to cell protection from the damage caused by free radicals. A particularly popular supplement with women, cranberries naturally contain anthocyanidins, proanthocyanidins and flavonoids, the main active constituents of which are carbohydrates and organic acids (including ascorbic acid). Cranberries are also rich in Vitamin C, providing effective antioxidant properties which are widely believed to contribute to cell protection from the damage caused by free radicals. The organic acids within cranberries are responsible for the sour taste of cranberries and so this highly concentrated extract is an ideal alternative to eating the somewhat bitter berries or drinking sugary cranberry juice.