Guayusa

BotanicalBest in the morning

What is it

Guayusa (Ilex guayusa) is a holly-family tree native to the Amazon whose leaves are brewed into a caffeinated tea. It is traditionally consumed by indigenous Ecuadorian and Peruvian communities and increasingly marketed as a yerba mate alternative.

Evidence for 2 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Alertness and energy (caffeine effects)

Strong Evidence

Caffeine content provides expected alertness benefits. The combination with theanine may yield smoother, less jittery alertness.

Antioxidant intake

Good Evidence

Rich in polyphenols similar to other Ilex teas; contributes to daily antioxidant intake.

How it works

Guayusa leaves contain caffeine (typically 2 to 3 percent), theobromine, theophylline, L-theanine, polyphenols, and saponins. The caffeine content per dried leaf is comparable to or higher than yerba mate, and similar to coffee per serving by brewing strength. The combination of caffeine with L-theanine and other compounds is claimed to provide alert energy without the jitter or crash associated with pure caffeine. This combination mirrors the alertness profile of green tea but at higher caffeine content. Guayusa is consumed traditionally as a strong morning infusion. It is rich in chlorogenic acids and other antioxidants. Modern consumption is mostly in tea bags, ready-to-drink beverages, and extracts.

Dosage

Brewed tea: 1 to 3 cups per day provides roughly 70 to 200 mg caffeine total, plus theobromine and theanine. Standardized extracts vary; follow product directions. Caffeine intake should be moderated based on individual tolerance.

When and how to take it

Best in morning or early afternoon. Avoid within 6 to 8 hours of bedtime to minimize sleep disruption. Traditional use is as an early morning brew.

3 commercial forms

Compare the main delivery options and what they’re best suited for.

Guayusa leaf tea

Traditional and most common form.

Standard preparation; caffeine extracted by brewing.

Guayusa extract powder

Used in pre-workout and energy supplements.

Concentrated; varies by manufacturer.

Ready-to-drink guayusa beverages

Brands include RUNA and others.

Bottled tea products.

Safety

Generally well tolerated at typical consumption levels. Side effects mirror caffeine intake: insomnia, anxiety, jitter, GI upset, increased heart rate at high doses. Long-term safety is supported by centuries of traditional use.

Who should be cautious

Pregnancy and breastfeeding: limit caffeine to under 200 mg/day; guayusa adds to caffeine intake. Anxiety, insomnia, cardiac arrhythmias: limit caffeine. Children and adolescents: limit caffeine intake.

Interactions

Caffeine interactions: may potentiate stimulant medications, reduce sedative effects, interact with theophylline, lithium, and CYP1A2-metabolized drugs. Discuss with clinician if on medications.

Frequently asked questions

How does guayusa compare to yerba mate?⌄

Both are Ilex species teas with similar caffeine and theobromine content. Guayusa is generally smoother in flavor and from a different region (Ecuador/Peru vs Argentina/Paraguay/Brazil).

Does guayusa cause caffeine jitter?⌄

Many people report smoother alertness from guayusa than from coffee, possibly due to the theanine content. Individual responses vary.

References

Guayusa on Wikidata — Wikidata link

Guayusa on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Guayusa (PubMed search) — PubMed link

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.