Astragalus has gained a reputation as an antiviral and immune system booster. A staple in traditional Chinese medicine, astragalus is rich in polysaccharides, flavonoids, trace minerals, and amino acids.
Studies show that it can stimulate the immune system by increasing the activity of NK cells, macrophages, and T-cells. Taken long term, it may help prevent some upper respiratory conditions, including colds.
1/4 to 1 teaspoon liquid extract, 1 to 2 times daily.
Source: Michael T. Murray, ND
Dr. Murray is the author of more than 30 books on natural health, including The Encyclopedia of Natural Medicine.