Black Elderberry Extract CasNo.: 84603-58-7 is the dark purple berry from the European elder tree. The berries are used to make medicine. Historically, the flowers and leaves have been used for pain relief, swelling, inflammation, to stimulate the production of urine and to induce sweating. The bark was used as a diuretic, laxative and to induce vomiting In folk medicine, the dried berries or juice are used to treat influenza, infections, sciatica, headaches, dental pain, heart pain and nerve pain, as well as a laxative and diuretic.