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Although Cordyceps sinensisis often described as an herb, it’s actually a combination of a parasitic fungus and the larvae of a moth (a caterpillar). The fungus attacks the caterpillar and destroys it from within. The remaining structures of the caterpillar along with the fungus are dried and sold as cordyceps.
Cordyceps has a long history of use in China as a “tonic,” a substance said to generally strengthen the body, particularly following illness. It was also used to treat bronchitis, kidney failure, and tuberculosis. 1
Cordyceps is widely marketed today as treatment for many conditions. However, there is no reliable scientific evidence that it actually provides any medical benefits.
Most research on cordyceps was done in China and is not up to modern scientific standards. In general, double-blind , placebo-controlled studies are the most reliable form of evidence. (For information on the reasons why, see Why Does This Database Rely on Double-blind Studies? ) However, such studies have to be performed and reported according to certain standards. Although several double-blind studies have been reported on cordyceps, they all fall considerably short of the level necessary for scientific validity. These somewhat dubious double-blind trials hint that cordyceps might be helpful for reducing high...
Use of cordyceps does not generally cause apparent side effects. However, comprehensive safety studies have not been reported. In addition, there are two case reports in which cordyceps products contained enough lead to cause lead poisoning. 2 Safety in young children, pregnant or nursing women, or people with severe liver or kidney disease has not been established.