Natural Factors Echinamide Fresh Herb Extract Clinical Strength - A pharmaceutical grade, 100% natural remedy that reduces the severity and duration of viral infections, such as the common cold. Stimulates the non-specific immune system via standardized levels of its three key immune-active compounds – alkylamides, polysaccharides and cichoric acid. Echinamide is the only antiviral that combines these compounds in a proprietary ratio, capturing each of their unique immune stimulating effects to produce an optimal medicinal benefit.