afc97589_Health_Information_Library__Why
[Used for] 2 Stars Immune Function 3 to 5 ml of liquid extract three times per day [Why] 
Studies have found that echinacea stimulates the function of a variety of immune cells, particularly natural killer cells. Taking it appears to speed recovery from the common cold. In general, human studies have found that echinacea taken orally stimulates the function of a variety of immune cells, particularly natural killer cells.15 The balance of evidence currently available from studies suggests that echinacea speeds recovery from the common cold , via immune stimulation (as opposed to killing the cold virus directly).16 Evidence on preventing the common cold with echinacea is largely negative, suggesting its immune-stimulating activity may be mild in generally healthy people. Other studies on oral echinacea have not found that it stimulates activity of the white blood cells known as neutrophils.17 Many doctors recommend 3 to 5 ml of tincture three times per day for up to two weeks to improve immune function. Echinacea in capsule form is also commonly available.
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