According to the USDA, of the blackberries harvested in the US, about 40% are used for jams and jellies, 25% for bakery products, 23% frozen or canned, and the 12% for juices or other food.Tsao et al. (2003) showed that, relative to other fruits, blackberries have high concentrations of polyphenolics such as anthocyanins with as much as 1923 ??g/g wet fruit.