Looking for an effective way to prevent and treat colds and flu? Try these two effective herbs: astragalus and echinacea. Taking two capsules of astragalus (Astragalus membranaceous) - an herb from traditional Chinese medicine - twice a day (unless the product directs otherwise) can help strengthen and support the immune system. Look for astragalus products standardized to 16-percent polysaccharides.
Echinacea (Echinacea purpurea) helps treat colds, flu, sore throat, and other common infections. Available as tinctures, extracts, capsules and tablets, take two capsules of freeze-dried extract four times a day or a dropperful of tincture, in water, four times a day at the first sign of an illness coming on. Look for combination echinacea products (containing both angustifolia and purpurea species) standardized to four-percent echinacosides.