Yerba mate is a caffeinated drink made from the leaves of a South American plant, and it contains about as much caffeine as a cup of tea but less than coffee
Yerba mate is a beverage brewed from the dried leaves and stems of the yerba mate plant, which grows in Paraguay, Argentina, and Brazil. A typical 8-ounce serving contains roughly 85 milligrams of caffeine—more than black tea (around 40 to 70 milligrams) but less than a cup of brewed coffee (around 95 to 200 milligrams, depending on brew strength). The drink has a slightly bitter, grassy flavor and is traditionally served hot in a gourd and sipped through a metal straw called a bombilla.
People drink yerba mate for the same reason they drink coffee or tea: the caffeine boost. But yerba mate also contains other compounds—including polyphenols, saponins, and xanthines—that some research suggests may have effects on energy, digestion, and mental focus. The drink is popular in South America as a social beverage, similar to how coffee functions in North America or tea in Asia.
Key Takeaways
- Yerba mate contains about 85 milligrams of caffeine per 8-ounce serving, placing it between tea and coffee in caffeine content.
- The drink comes from the leaves of a plant native to South America and is traditionally served hot in a gourd with a metal straw.
- Research suggests yerba mate may support alertness and mental focus, though most studies are small and more research is needed.
- Yerba mate contains compounds called polyphenols that function as antioxidants, which your body uses to manage cell damage from normal metabolism.
- Drinking yerba mate carries similar caffeine-related side effects as coffee and tea, including sleep disruption and jitteriness in sensitive people.
How yerba mate compares to coffee and tea on caffeine
If you're coming from the Coffee & Caffeine section, you already know that caffeine is a stimulant that increases alertness by blocking adenosine receptors in your brain. Yerba mate delivers this effect at a middle point: more caffeine than most teas, less than most coffee. An 8-ounce cup of yerba mate typically has 85 milligrams of caffeine, though this varies depending on how long the leaves steep and how finely they're ground. Commercial yerba mate drinks in cans or bottles may contain anywhere from 65 to 196 milligrams per serving, so checking the label matters if you're tracking your total caffeine intake.
The caffeine in yerba mate hits your system at roughly the same speed as coffee, meaning you'll feel the effect within 15 to 45 minutes. The duration is also similar—most people experience the peak effect for 3 to 5 hours, then a gradual decline. If you're sensitive to caffeine or drink yerba mate late in the day, it can interfere with sleep the same way coffee does.
What research shows about yerba mate and energy or focus
Most studies on yerba mate and mental performance are small, and researchers have not yet done large, long-term trials that would let us make strong claims. That said, the existing research points in a consistent direction: yerba mate appears to improve alertness and reaction time in ways similar to caffeine itself. One study found that people who drank yerba mate performed better on attention tasks compared to a placebo. Another found that a single dose improved reaction time and accuracy on a computer-based test.
The question researchers still can't fully answer is whether yerba mate's effects come entirely from its caffeine content or whether the other compounds in the drink—polyphenols, saponins, and theobromine (a stimulant also found in chocolate)—add something extra. Some laboratory studies suggest these compounds may enhance cognitive function, but human studies testing this directly are rare. For now, the safest conclusion is that yerba mate works as a caffeine source, and the other compounds may contribute, but we don't yet have proof of how much.
Antioxidants in yerba mate and what they do
Yerba mate contains polyphenols, a class of compounds that function as antioxidants. Your cells naturally produce reactive molecules called free radicals as a byproduct of metabolism and exposure to things like sunlight and pollution. Antioxidants neutralize these free radicals, preventing them from damaging cell structures. In theory, this reduces inflammation and slows aging at the cellular level.
Yerba mate is rich in polyphenols—in fact, it contains more polyphenols per serving than green tea, according to some analyses. However, the amount of polyphenols you absorb from drinking yerba mate depends on how it's prepared, how much you drink, and your individual digestion. Most human studies on yerba mate's antioxidant effects are small or done in laboratory settings rather than in people's bodies. This means we know yerba mate contains these compounds, but we don't yet have clear evidence that drinking it regularly reduces disease risk or slows aging in humans.
Possible digestive effects of yerba mate
Some people report that yerba mate helps with digestion or reduces bloating, and a few small studies suggest the drink may stimulate stomach acid production and increase bile flow—both of which support digestion. However, these studies are limited in size and scope. For people with acid reflux or sensitive stomachs, the caffeine and acidity in yerba mate can actually trigger symptoms, so it's not a universal digestive aid.
If you're considering yerba mate for digestive reasons, start with small amounts and observe how your body responds. Some people feel better; others experience heartburn or stomach upset. There's no research showing that yerba mate is better for digestion than other caffeinated beverages, so if you already drink coffee or tea without problems, yerba mate is unlikely to offer a digestive advantage.
Side effects and who should limit or avoid yerba mate
Because yerba mate contains caffeine, it carries the same side effects as coffee and tea: jitteriness, anxiety, sleep disruption, and increased heart rate in sensitive people. If you're already at your daily caffeine limit or if caffeine makes you anxious, yerba mate will have the same effect. Pregnant people are often advised to limit caffeine to 200 milligrams per day, so a cup of yerba mate counts toward that total.
Yerba mate also contains compounds called saponins, which some research suggests may interact with certain medications or reduce the absorption of some nutrients. If you take medications regularly, especially blood thinners or heart medications, ask your doctor before making yerba mate a daily habit. Additionally, yerba mate is acidic, so frequent consumption may contribute to tooth enamel erosion over time—a concern shared with coffee and acidic sodas.
How to prepare and drink yerba mate
Traditional preparation involves loose yerba mate leaves steeped in hot (not boiling) water—around 160 to 180 degrees Fahrenheit—for 3 to 5 minutes. The drink is served in a gourd and sipped through a metal straw called a bombilla, which has a filter at the bottom to keep leaves out of your mouth. In South America, yerba mate is often shared socially, with one gourd passed around a group.
If you don't have a gourd or bombilla, you can brew yerba mate like tea in a regular cup or infuser, or buy it pre-made in cans and bottles. Commercial yerba mate drinks vary widely in caffeine content, added sugar, and other ingredients, so reading the label is important if you're tracking intake. Some brands add herbs like mint or fruit flavors; others are plain. Start with a small amount to see how your body responds before making it a regular part of your routine.
Frequently Asked Questions
Does yerba mate have more caffeine than green tea?
Yes. Green tea typically contains 25 to 50 milligrams of caffeine per 8-ounce cup, while yerba mate contains around 85 milligrams. If you're sensitive to caffeine, yerba mate will have a stronger effect than green tea but less than coffee.
Can I drink yerba mate every day?
Yes, if you tolerate caffeine well and stay within your total daily caffeine intake. Most health organizations suggest limiting caffeine to 400 milligrams per day for adults. One cup of yerba mate fits easily within that limit, but if you also drink coffee or other caffeinated beverages, track your total.
Is yerba mate bad for your teeth?
Yerba mate is acidic, so frequent consumption may erode tooth enamel over time—a risk shared with coffee, tea, and citrus drinks. Drinking it through a straw and rinsing your mouth with water afterward can reduce this risk.
Does yerba mate interact with medications?
Yerba mate contains compounds that may interact with blood thinners, heart medications, and some other drugs. If you take medications regularly, ask your doctor or pharmacist before making yerba mate a daily habit.
What's the difference between hot and cold yerba mate?
The caffeine content is roughly the same whether you drink yerba mate hot or cold. Cold versions may have slightly different flavor profiles depending on steeping time, but the stimulant effect is comparable.