El mate (often just called “mate”) is a caffeinated drink made from the dried leaves of a holly plant native to South America. It’s the national beverage of Argentina, widely consumed in Paraguay, Uruguay, and southern Brazil, and increasingly popular worldwide. A single serving delivers roughly 80 mg of caffeine, comparable to a cup of coffee, but the ritual of drinking mate is far more distinctive than the drink itself: hot water is poured over leaves packed into a hollowed gourd, sipped through a metal straw, and shared in a circle.
The Plant Behind the Drink
Mate comes from Ilex paraguariensis, a perennial tree in the holly family. It grows natively in the subtropical forests of Argentina, Paraguay, and Brazil, thriving in the humid, fertile soils of regions like Misiones, Corrientes, and the Gran Chaco. The tree can reach 15 meters tall in the wild, though cultivated plants are kept shorter for easier harvesting. After picking, the leaves are dried, sometimes lightly roasted, and then aged before being ground into what’s sold as “yerba mate.”
What’s in a Cup of Mate
The caffeine in mate ranges widely depending on preparation. A standard 150 mL cup contains about 80 mg, but the traditional method of refilling the gourd repeatedly with hot water can push total intake past 260 mg in a single session. Beyond caffeine, mate contains theobromine (the same mild stimulant found in chocolate), typically 6 to 28 mg per gram of dry leaf.
Where mate really stands out is its antioxidant profile. The dominant antioxidant is chlorogenic acid, the same compound found in coffee but present in higher concentrations. Freshly harvested leaves contain 46 to 81 micrograms of chlorogenic acid per milligram of dry mass. The leaves also carry caffeic acid, several flavonoids, 15 amino acids, and a range of vitamins and minerals. Overall, mate appears to have a higher antioxidant concentration than green tea and most other tea-based drinks, though the two beverages contain different types of protective compounds.
How It Affects Your Body
Mate’s stimulant effect feels different from coffee to many drinkers, and the chemistry backs that up. The combination of caffeine and theobromine produces alertness without as sharp a spike and crash. Theobromine is a milder, longer-lasting stimulant that also relaxes smooth muscle, which is why mate drinkers often describe the energy as “smoother.”
Research on fat metabolism is particularly interesting. A study published in Nutrition & Metabolism found that people who consumed mate before exercise burned 24% more fat at moderate intensities compared to a placebo. At the same time, their bodies relied less on carbohydrates for fuel. The shift toward fat burning was most pronounced at lower exercise intensities, the kind of effort you’d sustain during a brisk walk or easy jog. These changes happened without any increase in peak heart rate or perceived effort, suggesting mate helps the body tap into fat stores more efficiently during everyday activity levels.
The antioxidant load, especially chlorogenic acid, also plays a role in metabolic health. Chlorogenic acid slows glucose absorption and has been linked to improved insulin sensitivity over time, which may partly explain why regular mate consumption in observational studies correlates with lower rates of metabolic syndrome in South American populations.
How Traditional Mate Is Prepared
The ritual matters as much as the ingredients. You start with a gourd (called a “mate”) and fill it about two-thirds full with yerba. Cover the top with your hand and shake it gently upside down so the finer leaf particles settle away from where the straw will go. Then tilt the gourd so the yerba forms a slope, piled high on one side with an empty pocket on the other.
Pour a small amount of cool or room-temperature water into that empty pocket. This step “wakes up” the leaves without scorching them. Let it sit for about a minute until the water absorbs. Then insert the bombilla, a metal straw with a filter at the bottom, into the moistened side. Heat your water to 70 to 75°C (about 160 to 170°F). This is well below boiling. Water that’s too hot turns the drink harsh and bitter. Pour it slowly into the gourd on the side opposite the yerba mound, filling just below the top of the leaves. Sip, refill, pass to the next person, repeat.
A good batch of yerba can handle 10 to 15 refills before the flavor fades, which is why a single session can deliver so much more caffeine than one cup suggests.
Tereré: The Cold Version
In Paraguay, where summer heat makes hot drinks impractical for much of the year, mate is traditionally served ice-cold as tereré. The preparation swaps hot water for cold or iced water, and the drink is commonly flavored with fresh herbs, squeezed citrus, or fruit juice. Lemon and orange are classic additions, along with mint leaves. Some versions include a touch of sweetener. Tereré is Paraguay’s national drink, distinct enough from hot mate to have its own cultural identity, and it’s the version most likely to appeal to newcomers who find the earthy bitterness of traditional mate too intense.
One Safety Concern Worth Knowing
For years, mate was loosely associated with higher rates of esophageal cancer in South America. In 2016, the International Agency for Research on Cancer clarified the picture considerably. Mate itself, consumed at normal temperatures, is not classifiable as a carcinogen. The risk comes from drinking temperature. Any beverage consumed above 65°C is classified as “probably carcinogenic” to the esophagus, and in regions where mate is traditionally drunk very hot (around 70°C or above), cancer rates are higher. The same pattern shows up in China and Iran with tea, and in Turkey with other hot drinks. The takeaway is straightforward: let your water cool to the recommended 70 to 75°C range before pouring, and you avoid the issue entirely.
A Growing Global Market
Mate has moved well beyond South America. The global yerba mate market is valued at roughly $2.1 billion in 2025 and is projected to reach $3 billion by 2032, growing at about 5.3% per year. Latin America still accounts for nearly 40% of worldwide production, with Argentina as the largest producer and Brazil as the top exporter (about $102 million in exports in 2024, with Argentina close behind at $82.5 million). Paraguay is increasingly targeting Asian markets to diversify its sales. In North America and Europe, mate shows up in canned energy drinks, loose-leaf teas, and supplement capsules, though the traditional gourd-and-bombilla method remains the most common way it’s consumed globally.