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Limited evidenceHeart & metabolic

Yerba Mate

A caffeinated polyphenol-rich tea with modest, inconsistent effects on blood lipids and no convincing weight-loss data. The more important finding in the literature is a consistent association between heavy, very hot mate drinking and oesophageal cancer.

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What the science says

  • Blood lipids and cardiometabolic markers Limited evidence

    A randomized crossover study of standardized mate extract in men at cardiovascular risk found modest reductions in LDL cholesterol and improvements in oxidative-stress markers over several weeks. Other controlled trials, including comparisons with green tea in dyslipidaemic overweight patients, have produced mixed results, and effect sizes are small relative to established lipid therapy.

  • Weight loss and fat oxidation Limited evidence

    Acute studies show mate raises fat oxidation during exercise, which is expected from its caffeine content, but trials measuring actual body weight or fat mass over weeks are few, small and largely unconvincing. There is no adequately powered RCT supporting mate as a weight-loss intervention.

  • Oesophageal cancer risk Moderate evidence

    A meta-analysis of observational studies found mate drinking significantly associated with oesophageal squamous cell carcinoma, with risk rising with amount consumed. The mechanism appears to be primarily thermal injury from drinking at very high temperature: the IARC classifies very hot beverages above 65 C as probably carcinogenic to humans, while mate drunk at moderate temperature is not classified as carcinogenic.

  • Alertness and mental performance Limited evidence

    Mate contains roughly 30-90 mg caffeine per cup plus theobromine, and produces the alertness you would expect from that dose. Claims of a uniquely smooth or jitter-free stimulation from its saponins are marketing, not trial findings.

Dosage & safety

Studied doseTraditional consumption is 0.5-1 L of infusion per day from roughly 50 g of leaves, refilled repeatedly. Clinical studies used 1-3 g/day of dried leaf or standardized extract. If you drink it, let it cool below about 60-65 C before the first sip.
SafetyThe main effects are caffeine-related: insomnia, anxiety, palpitations and raised blood pressure. Heavy long-term consumption is associated with oesophageal, laryngeal and oral cancers, an association strongest for very hot and high-volume drinking and amplified by smoking and alcohol. Traditionally smoke-dried mate can carry polycyclic aromatic hydrocarbons; air-dried products reduce this exposure. Mate has mild MAO-inhibitory activity in vitro, so avoid combining with MAOIs, and keep total caffeine under about 200 mg/day in pregnancy. Interacts with stimulants, theophylline and fluvoxamine.

How to take it

TimingMorning to early afternoon, because of the caffeine.
With food?With or without food.
Worth knowingLet it cool below about 60-65 C before the first sip — the oesophageal cancer association tracks very hot, high-volume drinking rather than mate itself.

Interactions

With medications

  • MAOIs

    Mate has mild MAO-inhibitory activity in vitro and carries caffeine, a combination that risks raised blood pressure. do not combine

  • theophylline

    Additive stimulant and cardiac effects. do not combine without medical supervision

  • fluvoxamine

    Caffeine clearance is markedly slowed, amplifying the stimulant effect. do not combine

With other supplements

  • caffeine and other stimulants

    Additive caffeine load causing insomnia, palpitations and anxiety. count it towards a 400 mg/day caffeine ceiling

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does yerba mate help with weight loss?

There is no convincing evidence: yerba mate raises fat oxidation during exercise as expected from its caffeine, but trials measuring body weight or fat mass are few, small and largely unconvincing. The evidence for yerba mate is limited overall.

Does yerba mate cause cancer?

Heavy, very hot yerba mate drinking is associated with oesophageal cancer (moderate evidence), probably through thermal injury. The IARC classifies beverages above 65 C as probably carcinogenic, while mate at moderate temperature is not classified — so let yerba mate cool below about 60-65 C before drinking.

How much caffeine is in yerba mate?

Yerba mate contains roughly 30-90 mg caffeine per cup plus theobromine, and gives the alertness you would expect from that dose. Count yerba mate toward a 400 mg/day caffeine ceiling and drink it in the morning or early afternoon.

Can yerba mate be taken with antidepressants?

Avoid yerba mate with MAOIs, since it has mild MAO-inhibitory activity in vitro and carries caffeine, and with fluvoxamine, which markedly slows caffeine clearance. Yerba mate also adds to theophylline and other stimulants.

Scientific references

Where to buy

Source Naturals, Yerba Mate, 600 mg, 90 Tablets

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