Yerba mate is not green tea. Despite being brewed and sipped in similar ways, the two come from completely different plants, grow on different continents, and have distinct chemical profiles. The confusion is understandable because both are caffeinated, steeped from dried leaves, and often marketed in the same aisle, but that’s where the overlap ends.
Two Different Plants From Two Different Families
Green tea comes from Camellia sinensis, an evergreen shrub native to East Asia that also produces black, white, and oolong tea depending on how its leaves are processed. Yerba mate comes from Ilex paraguariensis, a species of holly native to South America, primarily Argentina, Brazil, Paraguay, and Uruguay. The genus Ilex includes roughly 600 species of holly, and several of them are brewed into traditional drinks across different cultures.
The two plants aren’t even distant relatives within the same botanical family. Green tea belongs to the family Theaceae, while yerba mate belongs to Aquifoliaceae. They evolved separately, on separate continents, and produce different sets of beneficial compounds. Calling yerba mate a type of green tea is a bit like calling a sweet potato a type of potato: similar use, completely different biology.
How the Caffeine Compares
Both drinks contain caffeine, which is one reason people lump them together. Per cup, yerba mate delivers roughly 42 mg of caffeine, while green tea comes in around 35 mg. That’s a modest difference, and both sit well below coffee, which typically ranges from 80 to 120 mg per cup.
The bigger distinction is what else comes along for the ride. Green tea is rich in L-theanine, an amino acid that promotes calm focus by working alongside caffeine. Green tea leaves contain about 6.5 mg of L-theanine per gram. Yerba mate does not appear to contain meaningful amounts of L-theanine. Instead, yerba mate delivers theobromine (the mild stimulant also found in chocolate) and theophylline, which together create a different kind of energy boost. Many mate drinkers describe the feeling as sustained and physical, more like a full-body alertness than the quiet mental clarity that green tea is known for.
Different Antioxidants, Different Strengths
Green tea’s most celebrated compounds are catechins, a group of antioxidants led by one called EGCG. These are responsible for much of green tea’s reputation for supporting heart health and metabolic function. Yerba mate contains very little EGCG. Its antioxidant profile leans instead on chlorogenic acids (the same type found in coffee), flavonoids like quercetin and rutin, and a class of compounds called saponins that green tea lacks entirely.
Those saponins are worth noting. In animal studies, a purified saponin fraction from mate reduced visceral fat weight by 35%, lowered blood triglycerides, and decreased glucose processing in both liver and fat tissue. These effects support mate’s long folk reputation as a weight-management aid, though human research is still limited. Green tea has its own body of weight-related research, centered on catechins rather than saponins, so the two drinks may support metabolic health through entirely different mechanisms.
How They’re Prepared
Green tea is typically brewed with water around 70 to 80°C (160 to 175°F) for one to three minutes, using a few grams of leaves per cup. Yerba mate’s traditional preparation is a different experience altogether. Dried mate leaves are packed into a hollowed gourd (called a matero) to fill about a quarter of the vessel, then steeped with water at 65 to 80°C. A metal straw called a bombilla filters out the leaves as you drink. The same leaves are refilled with water and re-steeped many times over a single session, sometimes for hours.
In Paraguay and southwestern Brazil, a cold version called tereré is just as popular. The leaves are steeped with cold water, often with lemon or citrus juice added. A small clinical study of 23 healthy adults found that drinking cold mate actually produced better cardiovascular effects than hot mate, reducing the heart’s oxygen demand rather than increasing cardiac workload.
A Safety Concern Unique to Yerba Mate
One important difference between these drinks has nothing to do with the plants themselves and everything to do with processing. Most commercial yerba mate is dried using smoke exposure, which introduces polycyclic aromatic hydrocarbons (PAHs) into the leaves. PAHs are the same carcinogenic compounds found in charred meat and cigarette smoke.
The numbers are striking. Traditionally smoked commercial mate samples averaged 1,703 ng/g of total PAHs, compared to just 621 ng/g in a sample that was never smoke-dried. Research has found that PAH metabolites show up in the urine of regular mate drinkers at levels comparable to those seen in cigarette smokers. One study of 244 adults confirmed a dose-response relationship: the more mate consumed, the higher the urinary PAH levels.
This doesn’t mean mate is as dangerous as smoking, but it does mean the processing method matters. If this concerns you, look for brands labeled “unsmoked” or “air-dried,” which significantly reduce PAH exposure. Green tea processing doesn’t involve smoke drying, so this particular issue doesn’t apply.
Which One Should You Choose
If you’re after calm, focused energy with well-studied antioxidant benefits, green tea’s combination of L-theanine and catechins is hard to beat. If you want a stronger physical pick-me-up with a social drinking tradition and a distinct earthy, slightly bitter flavor, yerba mate offers something green tea simply can’t replicate. Neither is a substitute for the other because, despite appearances, they aren’t variations of the same drink. They’re two separate plants with two separate sets of compounds that happen to end up in a cup of hot water.