Also known as purple coneflower or snakeroot, echinacea is a North American wildflower that has become popular in flowerbeds and backyard gardens. The root and above-ground parts of the plant are used in herbal preparations. It is one of the most popular herbs used to promote immune health and seasonal wellness. Swanson Premium Echinacea delivers 400 mg of this herb in either 100 capsule or 180 capsule bottles or 500 mg in Echinacea Liquid Extract. Swanson Superior Herbs Echinacea is standardized to deliver 4% echinacosides, an active chemical in Echinacea.