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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. 1 Safety in young children, pregnant or nursing women, or people with severe liver or kidney disease has not been established.
- Wu TN, Yang KC, Wang CM, et al. Lead poisoning caused by contaminated Cordyceps , a Chinese herbal medicine: two case reports. The Sci Total Env. 1996;182:193-195.