Black elderberry (Sambucus nigra) fruit has a long history of use as a tonic in traditional European herbal systems.* Black elderberries are known to possess a variety of natural compounds that help to maintain health and well-being, such as potent, free radical-scavenging anthocyanins and other beneficial nutrients.* Protocol For Life Balance^® Sambucus Black Elderberry Liquid Concentrate is a non-GMO supplement formulated with a 10:1 elderberry concentrate that delivers 500 mg per teaspoon serving.