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Safety note
Healthy people took lingzhi for 4 weeks; no liver or kidney toxicity seen
In a at the Hong Kong Polytechnic University, 18 healthy adults aged 22 to 52 took 1.44 g a day of a lingzhi preparation (roughly equivalent to 13.2 g of fresh lingzhi) for 4 weeks. The study looked at antioxidant status, cardiovascular risk, DNA damage, immunity, inflammation and liver and kidney toxicity, among other measures. No liver or kidney toxicity or DNA damage was reported.
Controlled human trialCompares people who took it with people who did notHow the study was done
The same people took lingzhi and a in turn, and blood and urine measures before and after were compared.
What the researchers say
The participants were healthy people. The researchers believe these data can support future controlled trials in higher-risk groups.
Source
Wachtel-Galor S, Tomlinson B, Benzie IFF, British Journal of Nutrition, 2004, 91: 263-269
Study design checked against the abstract; results as reported in the two books, full text still to be checked Last updated: 2026-10-06
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