Guayusa is a caffeinated leaf drink from Ecuador that some people use for sustained energy and mental focus

Guayusa is a plant native to the Amazon rainforest in Ecuador. For centuries, Indigenous Kichwa people have brewed its leaves into a tea to stay alert during nighttime hunts. Today, people drink guayusa for its caffeine content and the steady energy it provides—without the jitters some experience from coffee.

The leaf comes from a tree called Ilex guayusa, which grows in Ecuador's cloud forests. When you brew dried guayusa leaves, you get a drink that tastes earthy and slightly bitter, similar to green tea but stronger. The caffeine content is high: a single cup can contain as much caffeine as a cup of coffee, sometimes more depending on how long you steep it.

Guayusa is not a medical treatment. It is a beverage with caffeine, and like any caffeinated drink, it affects different people in different ways. If you are considering guayusa as part of your routine, understanding what it actually does—and what it does not do—helps you make an informed choice.

Key Takeaways

  • Guayusa contains roughly 50 to 90 milligrams of caffeine per cup, comparable to coffee, and produces a sustained energy boost rather than a sharp spike.
  • The leaf has been used by Ecuadorian Indigenous communities for centuries, but scientific research on its health effects in humans remains limited.
  • People report using guayusa for focus, alertness, and sustained energy during work or study, though individual responses vary widely.
  • Guayusa may cause sleep disruption, increased heart rate, or digestive upset in some people, especially those sensitive to caffeine.

How guayusa caffeine compares to coffee and other teas

Guayusa contains more caffeine than most herbal teas but roughly the same amount as a cup of brewed coffee. A typical 8-ounce cup of guayusa tea has 50 to 90 milligrams of caffeine, depending on how long you steep the leaves and how much leaf you use. For comparison, an 8-ounce cup of brewed coffee contains 80 to 100 milligrams, and a cup of black tea contains 25 to 50 milligrams.

The difference people often notice is not the total amount of caffeine but how it feels in the body. Many describe guayusa as producing a "clean" energy—a gradual rise in alertness without the sharp peak and crash that coffee sometimes brings. This may be because guayusa contains other compounds alongside caffeine that affect how your body processes it, though research on these compounds in humans is sparse.

If you are sensitive to caffeine or have a condition that makes high-caffeine drinks risky for you, guayusa carries the same cautions as coffee. Drinking it in the afternoon or evening can interfere with sleep, and it may increase heart rate or cause jitteriness in some people.

What research says about guayusa's effects

Scientific studies on guayusa in humans are limited. Most research has been done in test tubes or on animals, which means the results do not necessarily translate to how guayusa affects a person who drinks it. A few small human studies have looked at guayusa's caffeine content and general safety, but large, rigorous trials examining specific health claims are not yet available.

What we do know from existing research: guayusa leaves contain caffeine and compounds called polyphenols, which are also found in tea, coffee, and many plants. Polyphenols have antioxidant properties in laboratory settings, but whether drinking guayusa gives you meaningful antioxidant benefits in your body is not yet clear from human research.

The traditional use of guayusa by Kichwa communities over centuries suggests it is generally safe for most people when consumed as a tea. However, traditional use is not the same as scientific proof of health benefits. If you are pregnant, nursing, have heart problems, or take medications that interact with caffeine, talk with your doctor before adding guayusa to your routine.

Common reasons people drink guayusa

People report drinking guayusa mainly for sustained mental focus and alertness. Students and professionals sometimes use it during long work or study sessions because they say it keeps them sharp without the energy crash they get from coffee. Night-shift workers and people who need to stay awake during specific hours also turn to guayusa for this reason.

Some people prefer guayusa to coffee because they find the taste more pleasant or because they experience fewer digestive side effects. Others are drawn to it because of its cultural history and the fact that it comes from a specific place and tradition rather than a mass-produced commodity.

A smaller number of people use guayusa as part of a broader interest in traditional plant medicines or Amazonian ethnobotany. For them, guayusa represents a connection to Indigenous knowledge and sustainable harvesting from rainforest ecosystems.

Possible side effects and who should avoid guayusa

Because guayusa contains significant caffeine, the side effects are similar to those of coffee or strong tea. Some people experience jitteriness, anxiety, or an increased heart rate. Others report sleep disruption if they drink it too late in the day. Digestive upset, including stomach irritation or the urge to urinate more frequently, can also occur.

Certain groups should be cautious or avoid guayusa altogether. If you are pregnant or nursing, high caffeine intake is generally discouraged, and you should check with your doctor. People with heart arrhythmias, high blood pressure, or anxiety disorders may find that guayusa worsens their symptoms. If you take medications—especially those for heart conditions, anxiety, or sleep—caffeine can interfere with how they work, so a conversation with your doctor or pharmacist is important.

If you have never had guayusa before, starting with a small amount (half a cup) can help you see how your body responds before you make it a regular part of your routine.

How to prepare guayusa tea at home

Guayusa is sold as dried leaves, usually in bulk or in tea bags. To brew it, use about one teaspoon of dried leaves per 8 ounces of hot water. Steep for 3 to 5 minutes for a lighter brew or 5 to 10 minutes for a stronger one. The longer you steep, the more caffeine and flavor you extract.

Some people prefer to use water that is just below boiling (around 200°F) rather than a rolling boil, which can make the tea taste less bitter. You can drink guayusa plain or add honey, lemon, or other flavors to suit your taste. Unlike some herbal teas, guayusa leaves can be steeped multiple times, so you can reuse the same leaves for a second or third cup with slightly less caffeine each time.

Guayusa is not widely available in every grocery store, but it can be ordered online from specialty tea retailers, some health food stores, or directly from Ecuadorian suppliers. Prices vary, but guayusa is generally more expensive than common teas because it is less widely cultivated and must be imported.

Guayusa and sustainable sourcing from Ecuador

Most guayusa comes from small farms and wild-harvested plants in Ecuador's Amazon region. When you buy guayusa, you are supporting farmers and communities in Ecuador, which is one reason some people choose it over other caffeinated beverages. However, not all guayusa is sourced equally, and some producers pay more attention to environmental and labor practices than others.

If sustainable sourcing matters to you, look for guayusa labeled as fair trade or organic, or buy from suppliers who describe their sourcing practices. These certifications and descriptions do not may provide perfection, but they are signals that the producer has met certain standards for environmental care and fair payment to farmers.

Frequently Asked Questions

Is guayusa safe to drink every day?

For most people without caffeine sensitivity or medical conditions that contraindicate caffeine, daily guayusa consumption is likely safe. However, drinking high-caffeine beverages every day can lead to caffeine dependence, meaning you may experience headaches or fatigue if you stop. If you drink guayusa daily, monitor how you feel and consider taking occasional breaks.

Does guayusa have any calories or sugar?

Plain brewed guayusa tea has virtually no calories and no sugar. If you add honey, milk, or other ingredients, those will add calories and sugar. Check the label if you buy pre-made guayusa drinks, as some commercial versions contain added sugars.

Can I drink guayusa if I am sensitive to caffeine?

Guayusa contains as much or more caffeine than coffee, so it is not a good choice if you are caffeine-sensitive. If you want to try it, start with a very small amount (a few sips) to see how your body responds, and avoid it in the afternoon or evening to protect your sleep.

How does guayusa taste compared to green tea or coffee?

Guayusa tastes earthy and slightly bitter, more similar to green tea than to coffee, but with a stronger, more robust flavor. Some people describe it as grassy or woody. Taste is personal, so you may enjoy it or find it too strong—trying a small amount first is the best way to know.

Is guayusa the same as yerba mate?

No. Guayusa and yerba mate are both caffeinated South American plant beverages, but they come from different plants and regions. Yerba mate comes from Paraguay, Argentina, and Brazil and has a different flavor and caffeine profile. Both are caffeinated teas, but they are distinct drinks.