Milk vetch has been used for many centuries in TCM to correct ‘spleen deficiency’, which has been associated with cellular immune dysfunction.3 It originates from Shanxi Province, China, but now grows in several provinces in northern China.4 Some Astragalus-species also grow in the East Mediterranean area. In the 1980s, milk vetch was popularized as an immunostimulant in the United States by the media.6