Fake caterpillar fungus
Chinese food inspectors have issued a warning
to those planning to buy caterpillar fungus: Many samples of caterpillar fungus have been replaced by fakes. These fakes "not only miss their medicinal function, but could even be poisonous."
According to Wikipedia, caterpillar fungus
is one of the most prized ingredients in traditional Chinese and Tibetan medicine:
it is used as an aphrodisiac and as a treatment for a variety of ailments from fatigue to cancer. It is regarded as having an excellent balance of yin and yang as it is apparently both animal and vegetable (though it is in actuality not vegetable, but fungal).
So my guess is that the "real" stuff does basically nothing.
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