Sundown Naturals Echinacea 400 mg provides you with a centuries-old way to support immune health.* As one of the world's leading herbs for immune support, Echinacea is a great holistic way to support the body’s defenses and immune system health.* Sundown Naturals ?Natural Whole Herb products utilize ground plant parts to provide the natural components found in nature. The Echinacea contained in these capsules is derived from the flowering aerial parts of the Echinacea plant.