Supplement · Adaptogens & traditional herbs
Turkey tail mushroom
Also known as: Trametes versicolor, PSK, PSP
An immune mushroom with the strongest evidence as a cancer-care adjunct.
- Evidence
- Silver· human data
- Sources cited
- 1
- Last reviewed
- 22 July 2026
Turkey tail is a well-studied medicinal mushroom whose beta-glucan fractions (PSK and PSP) are used as immune-support agents.
Its strongest evidence is as an adjunct to conventional cancer treatment in some studies, particularly from Japan, where PSK is an approved agent. For everyday immune 'boosting' in healthy people the evidence is much thinner. Any use around illness should be alongside, not instead of, medical care.