Guayusa Tea Benefits: What the Research Really Says

What are the benefits of Guayusa tea?

Guayusa (Ilex guayusa) is a naturally caffeinated Amazonian leaf traditionally consumed in Ecuador. Today, people often choose it as a morning or daytime drink for its caffeine, distinctive flavour and long cultural history.

Guayusa is also frequently surrounded by ambitious health claims. Some are based on interesting early research, while others go beyond what scientists have actually demonstrated. Here is a more grounded look at what we currently know.

1. Guayusa is a natural source of caffeine

The clearest reason Guayusa can support alertness and energy is simple: the leaf naturally contains caffeine. The exact amount in a cup can vary with the leaf, serving size, water temperature and brewing time.

Caffeine is well studied and can temporarily increase alertness and reduce feelings of fatigue. Guayusa therefore offers another naturally caffeinated option for people who enjoy tea but want something different from coffee or traditional tea.

For a deeper look at caffeine, see our guide to Guayusa caffeine.

2. Guayusa contains theobromine and plant polyphenols

Research examining Guayusa leaves and extracts has identified caffeine, theobromine, chlorogenic acids and a variety of polyphenolic compounds.

These compounds are one reason Guayusa continues to attract scientific interest. However, identifying beneficial plant compounds in a leaf is not the same as proving that drinking the tea prevents or treats disease.

3. Guayusa has demonstrated antioxidant activity in laboratory research

Laboratory studies of Guayusa tea preparations have measured polyphenol content and antioxidant activity. Researchers have also studied its effects in cellular models.

This tells us that Guayusa contains biologically interesting plant compounds. It does not mean that a cup of Guayusa should be marketed as a treatment for oxidative stress or any medical condition. Human health outcomes require much stronger clinical evidence.

4. Early human research on energy, mood and cognition is promising but limited

Human research on Guayusa is still relatively small. A randomized, double-blind crossover study compared caffeine from Guayusa extract with other caffeine sources and found some differences in physiological response, while also reporting no significant differences in heart rate or blood pressure in that small study.

Other controlled research has examined acute mood and cognitive outcomes following standardized Guayusa extracts.

These results are interesting, but there is an important distinction: the studies used standardized extracts with controlled doses. They do not prove that every traditionally brewed cup of Guayusa will produce the same effects.

5. What about the famous “no jitters, no crash” claim?

Many Guayusa drinkers describe the experience as smoother than coffee. That can be a genuine personal experience, but it should not be treated as a guarantee.

Guayusa still contains caffeine, and caffeine affects people differently depending on dose, tolerance, genetics, medications, sleep and individual sensitivity.

The available human research is not strong enough to promise that Guayusa cannot cause jitters or a caffeine crash.

If you are curious about the practical differences, read Guayusa vs Coffee.

6. Is Guayusa healthy?

It is more useful to think of Guayusa as a naturally caffeinated plant beverage rather than a miracle supplement.

It contains caffeine and a range of naturally occurring plant compounds, and emerging research is exploring its potential effects. But broader claims involving detoxification, disease prevention, dramatic weight loss or guaranteed cognitive enhancement are not established by strong human evidence.

For most people, the simplest appeal is also the strongest: Guayusa is an interesting Amazonian leaf with natural caffeine, a rich cultural tradition and a smooth, approachable flavour.

How to enjoy Guayusa

Guayusa can be prepared hot, iced or as a cold brew. Brewing strength can be adjusted to taste, which also changes how much caffeine ends up in your cup.

See our complete guide to brewing Guayusa for serving amounts, steeping times and cold-brew instructions.

Sources & further reading

• Clinical and Translational Science: randomized crossover study of caffeine from Guayusa extract
• 2025 review of Guayusa history, traditional uses, chemistry and biological activity

The Upina approach

We believe Guayusa has a compelling story without exaggerating what it can do. Its traditional use in the Ecuadorian Amazon, naturally occurring caffeine and emerging scientific research already make it a remarkable plant.

Our goal is to share Guayusa in a way that respects both its cultural roots and the evidence.

New to the plant? Start with What Is Guayusa?, learn where to buy Guayusa in Canada, or read our U.S. Guayusa buying guide. The 5 Pound size includes free shipping to the USA.

Note: This article is for general educational purposes and is not medical advice. Guayusa contains caffeine. People who are pregnant, breastfeeding, sensitive to caffeine, taking medications or managing a health condition should consider appropriate professional guidance regarding caffeine intake.