What the Evidence Actually Supports About Coca Tea Health Benefits

Six claims follow coca tea almost everywhere it is sold: it settles the stomach, dulls pain, curbs appetite, lifts energy, supports immunity, and eases altitude sickness. The WHO Expert Committee on Drug Dependence (ECDD) critical review of coca leaf, published as an advance copy for the committee’s 48th meeting in Geneva in October 2025, weighs those claims against the scientific record. It was released by the World Health Organization.

The review’s own summary is careful. It describes stimulant activity through inhibition of dopamine and norepinephrine reuptake, plus antioxidant, anti-inflammatory and antimicrobial properties supported by preclinical evidence, and hepatoprotective, antidiabetic and anorectic effects with limited human data. On traditional use for energy, altitude sickness and digestion, it states that clinical evidence remains limited.

The World Health Organization separately announced that the ECDD recommended keeping coca leaf in Schedule I of the 1961 Single Convention, and that the Commission on Narcotic Drugs confirmed that position at its 69th session, held 9 to 13 March 2026. In the same announcement, WHO said the committee found that traditional chewing and coca tea drinking do not appear to pose significant public health risks, and encouraged further research on long-term effects and possible therapeutic properties.

Sorting the six claims by what has actually been tested

• Digestion: documented traditional use, not clinical proof. A review in Emergency Medicine International, hosted at PubMed Central, describes coca leaf tea being taken in the Andes for stomach pain, intestinal spasm, nausea, indigestion, constipation and diarrhea. The same review notes a paucity of medical data supporting safe use.
• Pain relief: the same review records coca held in the mouth for painful oral sores and toothache — a topical, traditional application, not a tested oral analgesic effect.
• Weight loss: the WHO review lists anorectic effects with limited human data. That is a signal, not a finding in people.
• Energy: the clearest pharmacology of the six. The WHO review attributes stimulant activity to dopamine and norepinephrine reuptake inhibition, and notes studies suggesting improved exercise tolerance while calling the clinical evidence limited.
• Immune support: the WHO review reports antioxidant, anti-inflammatory and antimicrobial properties at the preclinical stage. No human immune outcome is claimed.
• Altitude sickness: the most universally believed and the least tested. A travel medicine review on PubMed Central states that guidelines have pointed out there are no efficacy studies of coca and coca products, and picks apart the observational studies that exist for undefined preparations and unstandardized doses.

Nutrition is where the sources openly diverge. The WHO review says coca may support nutritional intake; the travel medicine review describes later findings that coca had no nutritional benefit, or even adverse effects, after the earlier Harvard analysis promoted coca flour. We report the disagreement rather than resolve it.

A cup of coca tea contains measurable coca alkaloids

Any honest account has to include this. A quantitation study published in Forensic Science International and hosted at PubMed Central measured what transfers from a commercial tea bag into the cup, and found that a single cup produced positive drug test results for cocaine metabolites.

For scale, the same study reports that benzoylecgonine stayed above 1,000 ng/ml for about 17 hours after one cup, against the 300 ng/ml immunoassay cutoff it cites. The current US federal workplace cutoffs, set by the Department of Health and Human Services in its Mandatory Guidelines for Federal Workplace Drug Testing Programs (2017), are 150 ng/ml for the initial test and 100 ng/ml for confirmation, so both measured peaks are more than 25 times the screening threshold.

The WHO review puts cocaine content across the four cultivated varieties at 0.11% to 1.02% by dry weight, and reports low acute toxicity in animal models, no fatal overdoses from traditional use, and adverse effects that are mainly local, such as irritation of the oral mucosa.

Why this matters

We argue for the coca leaf on the evidence, which means being the first to say where the evidence runs out. Four of the six popular claims rest on traditional use and preclinical work; one, the stimulant effect, has a described mechanism; and altitude sickness — the claim most Americans have heard — has no efficacy studies behind it at all.

That is not a case against the leaf. It is a case against the thirty-year research gap that WHO has now formally acknowledged and asked to be closed. Schedule I stayed in place, so the constraint on serious clinical work stays too.

The practical takeaway is narrower and more useful than any benefits list: coca tea is not a decaffeinated herbal blank, it delivers measurable coca alkaloids, and anyone subject to workplace drug testing should treat a positive result as the expected outcome rather than an anomaly.

This article replaces an earlier version published in 2020.

Frequently Asked Questions

Does coca tea actually help with altitude sickness?

A travel medicine review published on PubMed Central states that guidelines have noted there are no efficacy studies of coca and coca products for altitude sickness, and criticizes the observational studies that exist for using undefined preparations and unstandardized doses. The WHO Expert Committee on Drug Dependence lists altitude sickness among traditional Andean uses of coca leaf while stating that clinical evidence remains limited. No controlled trial establishing an effect has been identified.

How much cocaine is in a cup of coca tea?

A quantitation study hosted on PubMed Central measured an average of 4.14 mg of cocaine transferred into a 180 ml cup made with a Peruvian coca tea bag and 4.29 mg with a Bolivian bag. Exhaustive extraction of the bags themselves yielded averages of 5.11 mg and 4.86 mg respectively. The study reported that a single cup produced positive drug test results for cocaine metabolites.

Will drinking coca tea make me fail a drug test?

A study published on PubMed Central found that consumption of a single cup of Peruvian or Bolivian coca tea produced positive drug test results for cocaine metabolites. Peak urine benzoylecgonine reached 3940 ng/ml at 10 hours after Peruvian tea and 4979 ng/ml at 3.5 hours after Bolivian tea in the individual tested. Anyone subject to workplace testing should treat that outcome as expected.

What did the WHO decide about coca leaf in 2025?

The WHO Expert Committee on Drug Dependence recommended keeping coca leaf in Schedule I of the 1961 Single Convention on Narcotic Drugs following its critical review. The World Health Organization stated that the Commission on Narcotic Drugs confirmed that position at its 69th session, held 9 to 13 March 2026. Because no change was proposed, no vote by the Commission was required.

Did the WHO say coca tea is dangerous?

The World Health Organization stated that its Expert Committee on Drug Dependence acknowledged that traditional coca chewing and coca tea consumption do not appear to pose significant public health risks, and that coca leaf holds important cultural meaning for Indigenous Peoples in the Andes. The committee's concerns centered on the expanding cocaine market and the ease of converting coca leaf into cocaine. The critical review also reports low acute toxicity in animal models and no fatal overdoses from traditional use.

Is coca leaf nutritious?

The sources disagree. The WHO critical review of coca leaf says studies suggest it may support nutritional intake, while noting that clinical evidence remains limited. A travel medicine review on PubMed Central describes later findings that coca had no nutritional benefit or even adverse effects, following an earlier Harvard analysis that promoted coca flour as a cheap nutritional supplement.

Is coca tea addictive?

The WHO critical review of coca leaf states that coca leaf use is not associated with significant dependence or abuse potential in limited ethnographic studies, while noting that high-dose extracts may produce cocaine-like effects in animal models. A separate review on PubMed Central reports no evidence in the literature that habitual whole coca use causes addiction or withdrawal of the kind seen with cocaine. Both describe the evidence base as limited.