100% Vegetarian Supplement Providing Pure Rubus Occidentalis Extract Each capsule provides a full 500 mg of extract. Rubus occidentalis contains antioxidants and is among one of the best sources of anthocyanins and ellagic acid. Today, Black Raspberries are enjoying renewed interest by both consumers and health professionals alike. Black Raspberries, often referred to as the "King of Berries," are a dark purple, edible, hollow fruit, which means the core of the fruit stays on the plant when it is picked. Botanically known as Rubus occidentalis, it is a deciduous shrub native to North America with an active growth period during the spring and summer. Black Raspberries provide antioxidants and are among one of the best sources of anthocyanins and ellagic acid. Anthocyanins are res.