Yerba Mate Benefits: Caffeine, Research and Is It Bad for You?

Yerba mate benefits come mostly from what it shares with coffee and tea: caffeine, which makes you feel more alert, plus plant compounds such as chlorogenic acids. Beyond that, the research is thin. Small trials reported lower cholesterol and less body fat, but a 2025 review of 13 randomized trials found no significant effect on cholesterol, waist size or body mass index overall. So is yerba mate bad for you? For most adults the main issues are the caffeine, how hot you drink it, and smoke-dried leaves that can carry cancer-causing compounds called polycyclic aromatic hydrocarbons (PAHs). Here is what the evidence shows, how much caffeine a serving holds, and what to check on supplement labels that list it.

Peptide Labs sells supplements that contain yerba mate, but this article does not recommend any of them. It is general information, not medical advice.

What is yerba mate?

Yerba mate is an infusion made from the dried leaves of Ilex paraguariensis, according to the World Health Organization’s cancer agency (IARC). It is drunk mainly in South America and is grown commercially in Brazil, Argentina and Paraguay. The traditional style, called chimarrão, is drunk very hot, with hot water added to the same leaves several times; tereré is the cold version. A 2025 genome study in eLife calls mate the third most widely consumed caffeine-containing infusion in the world and found that the plant evolved its own way of making caffeine, separate from coffee and tea.

Besides caffeine, the leaves contain two related stimulants, theobromine and theophylline, along with polyphenols such as chlorogenic acid, the same family of compounds found in unroasted coffee; see our guide to green coffee bean extract. Many producers dry the leaves with smoke, which matters for the safety section below.

Yerba mate caffeine: how it compares with coffee and tea

Yerba mate caffeine is real but usually more modest than coffee’s. A 2023 study of 11 caffeinated yerba mate drinks found about 31 to 70 milligrams per serving, while the NIH Office of Dietary Supplements (ODS) puts an 8-ounce cup of brewed coffee at about 85 to 100. Traditional loose-leaf mate is harder to pin down because the same leaves are topped up with water many times. A Brazilian lab study that simulated real drinking found the cold tereré method pulled out about 2.5 times more caffeine-type compounds than hot chimarrão made with coarse-ground leaf.

For most adults, the FDA cites 400 milligrams of caffeine a day as an amount not generally linked to negative effects, counting every source. Our guide on how much caffeine is too much explains that figure and who should aim lower. Fermented tea drinks add some caffeine too, as our kombucha guide explains.

Yerba mate benefits: what the research shows

The early trials looked encouraging. In a 2009 Brazilian study, 102 adults drank yerba mate daily for 40 days, and LDL cholesterol fell by about 9% compared with their starting levels, with a further 13% drop in people already taking statins, but results were compared with starting levels rather than a placebo group. A 2015 Korean trial with a placebo found less body fat after 12 weeks of yerba mate capsules, but it had only 30 participants.

Exercise studies point in different directions. A 2014 study of 14 people found more fat used for fuel after mate capsules, while a 2026 study of 29 adults found that two commercial brewed mates changed neither energy use nor fat use during cycling. The ODS also describes a 45-day trial in which a capsule combining yerba mate with guarana and damiana led to more weight loss than placebo, but combination products cannot show what yerba mate does alone.

The most complete look so far, a 2025 meta-analysis of 13 randomized trials, found no significant effect on cholesterol, triglycerides, fasting glucose, waist size or body mass index. In two small trials of people with prediabetes, after-meal glucose and HbA1c were lower, which the authors said needs confirmation. Their overall verdict: effects on lipids and weight management appear limited. Green tea has a similar story, told in our green tea extract guide, and our review of whether fat burners work covers caffeine-based weight products in general.

Is yerba mate bad for you?

For most healthy adults, moderate amounts of yerba mate are an ordinary caffeinated drink. Three issues deserve attention.

Very hot drinks and esophageal cancer

In 2016, IARC classified drinking any very hot beverage, meaning above 65 degrees Celsius, as probably carcinogenic to humans, based on studies in places where tea or mate is traditionally drunk at about 70 degrees. Drinking mate that is not very hot was rated not classifiable, because the evidence was inadequate. IARC’s director said the temperature, rather than the drinks themselves, appears to be responsible. A 2013 meta-analysis of nine studies did link mate drinking with a higher risk of one type of esophageal cancer, though it noted publication bias. Letting the drink cool before sipping is the simple step that follows from this research.

PAHs from smoke-dried leaves

Mate leaves are often dried with smoke. National Cancer Institute researchers found very high levels of PAHs, including benzo[a]pyrene, in eight commercial brands, and some of these compounds passed into both hot and cold infusions. A follow-up found large differences by brand, batch and processing, with the lowest benzo[a]pyrene in leaf processed without touching smoke. How much reaches your cup varies widely, and a 2018 risk assessment concluded that temperature, not PAH exposure, is the more likely cancer concern.

Caffeine effects and interactions

• Common effects: trials have reported mouth and throat irritation, trouble sleeping, rapid heartbeat, headache and stomach upset, with chest pain reported in some cases.
• Medicines: the antibiotic ciprofloxacin and the asthma drug theophylline can make caffeine’s effects stronger, according to MedlinePlus. Ask your pharmacist about your own medicines.
• Other stimulants: the ODS warns that combining caffeine with stimulants such as bitter orange can increase side effects.
• Pregnancy: ACOG advises less than 200 milligrams of caffeine a day from all sources; check with your provider before adding mate products.
• Heart rhythm problems, anxiety or high blood pressure: ask a clinician first.

Get medical care for chest pain, fainting, a racing or irregular heartbeat, or trouble swallowing.

Yerba mate in supplements: reading the label

In supplements, yerba mate usually appears inside stimulant blends, and the ODS notes that some labels list caffeine-containing herbs without declaring a caffeine amount. Two products we carry show how it is usually listed:

• Zantrex Blue lists yerba mate in a proprietary blend with guarana, caffeine, green tea, kola and other herbs, and its label states a xanthine mixture of about 300 milligrams per serving. The label says it is not for anyone under 18 or for use during pregnancy or nursing. Its bottle carries a “GLP-1 Support” banner, but it is a dietary supplement, not a GLP-1 medication.
• Animal Cuts lists yerba mate in a stimulant complex with caffeine, kola nut and guarana, plus tea and coffee bean extracts elsewhere in the pack. The label does not state total caffeine and warns against combining it with other caffeinated products.

Frequently Asked Questions

Questions about a label? Contact us or read our Buyer’s Guide. Follow the label and ask a healthcare provider before starting any supplement, especially if you take medicines. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Last reviewed September 2026.

Related guides: How Much Caffeine Is Too Much? Daily Limits, Overdose Signs and Label Math, Green Tea Extract and EGCG: Caffeine, Weight Research and Liver Safety, Do Fat Burners Work? Thermogenic Ingredients, Evidence and Risks.