The Natural Echinacea Extract Formula XXI from Soria Natural is a potent dietary supplement designed to support the proper functioning of the immune system. This freeze-dried extract comes from the echinacea plant (Echinacea purpurea), known for its medicinal properties and benefits in treating respiratory infections. Echinacea is part of the daisy family and is widely used to help combat the symptoms of the common cold. It is recommended to take 15 to 20 drops with some water three times a day.