Supplement analysis backed by scientific evidence · PT

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Limited evidenceStress & mood

Kudzu

Isoflavone-standardized kudzu extract has repeatedly reduced how much alcohol heavy drinkers consume in small trials - but nearly all of them come from one research group. Other marketed uses, including hangover prevention and menopause relief, are unsupported.

What the science says

  • Reduces alcohol intake in a laboratory drinking session Limited evidence

    Heavy drinkers treated for 7 days with kudzu extract or placebo, then given free access to their preferred beer in a naturalistic laboratory, drank significantly fewer beers, took more sips per beer and drank more slowly. Notably, the urge to drink was unchanged, and no side effects were reported. The design was a small within-subject crossover.

  • Reduced weekly drinking over 4 weeks Limited evidence

    Seventeen non-treatment-seeking male heavy drinkers (averaging 27.6 drinks/week) took standardized kudzu extract (NPI-031, 250 mg isoflavones three times daily) or placebo for 4 weeks. Kudzu significantly reduced the number of drinks consumed with no effect on craving, and produced no adverse events or changes in vital signs, blood chemistry, liver or renal function. Seventeen participants is a very small trial.

  • Menopause, hangover and cardiometabolic claims Limited evidence

    Kudzu isoflavones (puerarin, daidzin, daidzein) are phytoestrogens, which is why the root is marketed for hot flashes and hangovers. Human evidence for those uses is sparse and low-quality, and the well-designed alcohol trials say nothing about them.

Dosage & safety

Studied doseThe alcohol trials used standardized extracts supplying 500-750 mg isoflavones per day (for example 250 mg three times daily). Ordinary crude kudzu root products contain far less isoflavone and are not the material that was tested.
SafetyWell tolerated across weeks of use, with no liver enzyme, renal or vital sign changes in the controlled trials. Because it is phytoestrogenic, use caution with hormone-sensitive conditions and with tamoxifen. Puerarin may add to the effects of blood-pressure and glucose-lowering drugs, and interaction with methotrexate has been raised. Critically, kudzu is not a treatment for alcohol use disorder - it does not replace naltrexone, acamprosate or medical care, and should not be used as a licence to drink.

Scientific references

Where to buy

Vitacost, Kudzu Root Extract, 180 Capsules (600 mg per Capsule)

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