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Limited evidenceHeart & metabolic

Carqueja

A bitter Brazilian herb (Baccharis trimera) sold for liver detox, blood sugar, and weight loss with zero human randomized trials behind any of those claims. It also bioaccumulates heavy metals, which makes the quality question more than academic.

What the science says

  • Promotes weight loss Limited evidence

    A systematic review of medicinal plants used for weight loss in Brazil screened the literature for Baccharis trimera and found only preclinical work — no clinical trials in humans at all. Every weight-loss claim on a carqueja label is extrapolated from rodent lipid and glucose experiments.

  • Protects the liver / 'detox' Limited evidence

    Carqueja extract reduces markers of acute liver injury in a rat acetaminophen model and increases antioxidant enzyme activity in rat neutrophils. These are the studies marketers cite as 'liver support.' There is no human data on liver enzymes, liver fat, or any clinical liver outcome, and 'detox' is not a measurable endpoint.

  • Lowers blood glucose Limited evidence

    Ethnobotanical surveys list carqueja among the most-used antidiabetic plants in southern Brazil, and rodent studies show modest glucose reduction. No human trial has measured fasting glucose or HbA1c after carqueja, so the traditional reputation remains just that.

  • Heavy metal accumulation is a real quality risk Moderate evidence

    Baccharis trimera is a documented bioaccumulator: analysis of commercial extracts and infusions detected heavy metals and the samples produced cytogenotoxic effects in test systems. This is a property of the plant and its growing conditions, not an occasional manufacturing lapse, so third-party heavy metal testing matters more here than for most herbs.

Dosage & safety

Studied doseNo dose has been validated in humans. Traditional use is an infusion of roughly 1-3 g of dried aerial parts up to three times daily before meals; capsules typically supply 250-500 mg of dried herb or extract. Because there is no efficacy trial, there is also no evidence-based ceiling — treat label doses as convention, not science.
SafetyThe main concerns are contamination and misidentification. Carqueja concentrates heavy metals from soil, and the genus Baccharis includes B. coridifolia, which contains macrocyclic trichothecene mycotoxins responsible for livestock poisonings — botanical verification is not optional. Traditional use includes abortifacient and uterine-stimulant applications, so avoid entirely in pregnancy. Additive hypoglycemia is plausible if combined with metformin, sulfonylureas, or insulin, and the intensely bitter infusion commonly causes nausea. Anyone with existing liver disease should not use an unstudied herb for 'liver support.'

Scientific references

Where to buy

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