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Research finding
Japanese trial: lingzhi extract improved urinary symptoms (dose comparison)
50 men over 50 with urinary complaints took part in a trial comparing three daily doses: 0.6, 6 and 60 mg. After 8 weeks, the and quality of life improved in the 6 mg and 60 mg groups.
Controlled human trialCompares people who took it with people who did notHow the study was done
Compared with a group, with urine flow rate, prostate size, residual urine and PSA also measured.
What the researchers say
The researchers reported no clear changes in urine flow rate, prostate size, residual urine or PSA, and on that basis recommended 6 mg a day as the dose for further studies.
Source
Noguchi M et al., Asian Journal of Andrology, 2008
Abstract checked Last updated: 2026-10-06
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