A well-functioning immune system is paramount for protection against illness. For thousands of years, herbs have been used to balance and strengthen the body's defenses. Pharmacologically active components of herbs can be found in leaves, flowers, seeds, berries, roots and bark, depending on the plant selected. Recent research is revealing some of the benefits herbs may provide in regard to immunity.
Astragalus
Astragalus membranaceus, also called milk vetch, or huang qi, is a commonly used Chinese medicinal plant. It is valued for warding off infectious disease, cancer and for revitalizating immune defenses. Memorial Sloan Kettering Cancer Center reports that astragalus inhibits tumor growth, and delays onset of liver cancer in rats. It has also been shown to reduce immune suppression due to chemotherapy. A study published in the September 2, 2008 issue of the journal "Vaccine," demonstrated the immune stimulating effects of astragalus using an immunization model. Another study from the January-February 2007 issue of the "Journal of Internal Medicine Research," found that chemical components of astragalus increased the activity of macrophages, a type of immune system cell.
Echinacea
Echinacea, or purple cone flower species, are among the most widely consumed herbs in the U.S. This native American plant is used to ward off flu and colds and also to fight various infections, according to the University of Maryland Medical Center, and has demonstrated anti-viral, anti-inflammatory and hormonal effects. Additionally, in the Nov. 21, 2007 issue of "Phytotherapy Research," researchers concluded that ingesting echinacea promoted immune cell regulation in test subjects.
Ashwagandha
Ashwagandha is an herb used in the Ayurvedic system of medicine as a tonic for vitality and for a wide range of illnesses, including cancer and some inflammatory diseases. Active substances are derived from the root and berry. Research indicates ashwagandha may have anti-tumor and immune regulatory effects, explains Memorial Sloan Kettering Cancer Center. In the April 15, 2009 issue of the "Journal of Alternative and Complementary Medicine," researchers observed a significant increase in activation of immune cells.
Shiitake
The edible mushroom Lentinula edodes, also known as shiitake, has long been used in Asia for its beneficial effects on the immune system. Shiitake contains immune stimulating polysaccharrides, including 1, 3 beta glucans. The American Cancer Society describes shiitake as having anti-tumor and anti-viral properties.
