Outcome
    Moderate Evidence

    Reishi for Stress Resilience

    Reishi extract at 1.5-3 g/day reduced subjective fatigue and improved wellbeing over eight weeks in controlled work, supporting a slow adaptogenic effect.

    Overview

    Reishi is used traditionally as a calming tonic, and the best human data behind that reputation come from a controlled trial in neurasthenia, a syndrome of chronic fatigue, irritability and poor stress tolerance. Participants taking a standardised extract reported less fatigue and better wellbeing than those on placebo. The evidence base is thin compared with better-studied adaptogens, so the verdict sits at likely. Expect a gentle smoothing of stress reactivity over weeks rather than a noticeable lift on day one.

    What the evidence supports

    Reduced fatigue and improved sense of wellbeing in stress-related fatigue, from a small controlled trial.

    How It Works

    Reishi supplies triterpenes and beta-glucan polysaccharides. The triterpene fraction has mild sedative and anti-inflammatory activity in animal work, while the polysaccharides modulate immune signalling. Together these are proposed to dampen the inflammatory and autonomic components of chronic stress.
    Unlike stimulant-type adaptogens, reishi is not thought to act on catecholamine signalling, which fits the reported experience of calm rather than energy. Mechanistic detail in humans remains sparse.

    Dosing & Protocol

    Doses below reflect the standardised extracts used in trials. Extract strength varies widely between products, so check the labelled polysaccharide or triterpene content rather than raw mushroom weight.

    Allow eight weeks

    The trial measured change at eight weeks. Judge it on a full course, not a fortnight.

    Evidence

    Two records are linked to this pairing: a placebo-controlled trial in neurasthenia and a Cochrane review of reishi in cancer care, the latter relevant mainly for its safety and quality-of-life observations.

    Ganoderma lucidum (reishi mushroom) for cancer treatment

    Score: 8/10
    2016
    systematic_review
    n=373

    Jin X, Ruiz Beguerie J, Sze DM +1 more

    Quality-of-life measures improved with adjunctive Ganoderma, though sleep was not a primary endpoint.

    View source

    A randomized, double-blind and placebo-controlled study of a Ganoderma lucidum polysaccharide extract in neurasthenia

    Score: 6/10
    2005n=132

    Tang W, Gao Y, Chen G +6 more

    After 8 weeks, the reishi group showed significantly greater reductions in Clinical Global Impression severity scores and fatigue ratings, and greater improvement in sense of well-being, than placebo. The extract was well tolerated with no serious adverse events.

    View source

    A randomized, double-blind, placebo-controlled trial of Ganoderma lucidum for neurasthenia

    Score: 6/10
    2005
    rct
    n=132

    Tang W, Gao Y, Chen G +1 more

    Ganoderma polysaccharide extract significantly reduced fatigue and Clinical Global Impression severity over eight weeks.

    View source
    One small positive trial plus a cautious review is a modest base. Nothing contradicts the finding, but nobody has replicated it at scale, which is the main reason certainty stays low.

    Safety

    Reishi is usually well tolerated. Reported effects are dry mouth, digestive upset and occasional dizziness. Rare cases of liver injury have been described with powdered preparations, so stop and seek advice if nausea, dark urine or jaundice develop.

    Stop before surgery

    Reishi may mildly affect platelet function. Discontinue at least two weeks before planned surgery.

    Interactions & Conflicts

    Interacts withSeverityMechanismAction
    —Discuss with the prescriber before combining
    —Avoid unless supervised
    —Monitor if readings run low

    References

    Frequently Asked Questions

    Medical Disclaimer

    The information provided on this website is for educational and informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or before starting any supplement regimen.

    Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.