Herbs (Global Traditional) · Amazonian
Guayusa (Ilex guayusa) (Ilex guayusa)
Moderate Evidencebotanical1 PubMed Study
Hermetica Superfood Encyclopedia
Guayusa (Ilex guayusa) is an Amazonian holly plant containing caffeine, theobromine, and high levels of chlorogenic acid. Its antioxidant activity stems from polyphenolic compounds that neutralize free radicals and may support cellular protection.
Guayusa (Ilex guayusa) is a caffeinated holly tree native to the Ecuadorian Amazon, where indigenous communities harvest its leaves for traditional tea brewing. The leaves contain methylxanthines like caffeine and theobromine, along with chlorogenic acids, flavonoids, and carotenoids, typically processed through blanching, fermentation, or freeze-drying methods.
No human clinical trials, RCTs, or meta-analyses on guayusa have been conducted. The primary research consists of one in vitro compositional study (PMID 28188617) analyzing phenolic/carotenoid content and antioxidant capacity in processed guayusa leaves, finding chlorogenic acid as the dominant compound at 24.10 mg/g.
No clinically studied dosage ranges are available due to absence of human trials. Traditional use involves brewing dried leaves as tea, while GRAS-approved leaf extracts are standardized for chlorogenic acids but lack specific dosing guidelines. Consult a healthcare provider before starting any new supplement.
Guayusa (Ilex guayusa) is a caffeine-rich holly species consumed primarily as a brewed infusion rather than a whole food, so its nutritional relevance centers on bioactive compounds rather than macronutrients. Key constituents per dry leaf weight: **Methylxanthines** – caffeine 1.4–3.3% (14–33 mg/g dry leaf), theobromine 0.03–0.5%, trace theophylline; a typical 8 oz brewed cup delivers roughly 60–120 mg caffeine depending on preparation. **Phenolic acids & chlorogenic acid derivatives** – total chlorogenic acid content reported at 18–24 mg/g dry leaf in blanched/processed leaves (predominantly 5-caffeoylquinic acid, 3-caffeoylquinic acid, and 4-caffeoylquinic acid isomers); total polyphenol content ranges 30–80 mg GAE/g dry leaf depending on processing method (sun-dried vs. blanched vs. roasted). **Flavonoids** – quercetin and kaempferol glycosides detected at lower concentrations (approximately 0.5–2.0 mg/g dry leaf); rutin also reported. **L-theanine** – present in modest amounts (reported roughly 0.1–0.3% dry weight), which may modulate the stimulant profile of caffeine by promoting calm alertness. **Saponins & triterpenes** – ursolic acid and guayusaponins have been identified but quantitative data remain limited. **Vitamins & minerals** – the brewed infusion provides minor amounts of potassium, magnesium, calcium, manganese, and zinc; vitamin content is negligible in typical infusion volumes. **Essential amino acids** – detected in leaf tissue at low levels (leucine, valine, etc.) but nutritionally insignificant in tea-form consumption. **Fiber & protein** – whole dried leaf contains approximately 8–12% crude protein and 15–20% dietary fiber, but these are largely excluded from brewed preparations. **Antioxidant capacity** – ORAC values reported between 300–580 µmol TE/g dry leaf; DPPH IC50 values in the range of 10–30 µg/mL for methanolic extracts. **Bioavailability notes** – caffeine and theobromine are highly bioavailable from aqueous infusion (>90% absorption). Chlorogenic acids undergo partial hydrolysis by gut esterases and colonic microbiota to caffeic and quinic acids, with overall bioavailability estimated at 30–35%. Flavonoid glycosides have moderate bioavailability (10–30%) depending on glycosylation pattern. L-theanine is readily absorbed via intestinal amino acid transporters. Fat-soluble triterpenes (e.g., ursolic acid) have poor aqueous extraction and low oral bioavailability (<1–5%) unless consumed with lipids or in extract form.
Guayusa's caffeine and theobromine act as adenosine receptor antagonists, blocking fatigue signals and promoting alertness. Chlorogenic acid and other polyphenols donate electrons to neutralize reactive oxygen species through DPPH and ORAC pathways. The combination of methylxanthines may also inhibit phosphodiesterase enzymes, increasing cyclic AMP levels.
Current evidence is limited to in vitro antioxidant studies showing high DPPH and ORAC scavenging capacity. Blanched guayusa leaves retain 24.10 mg/g chlorogenic acid, demonstrating significant antioxidant potential. No human clinical trials have been conducted to validate traditional energy-enhancing claims. Traditional use evidence suggests stimulant effects, but controlled studies are needed to confirm therapeutic benefits.
Guayusa contains caffeine and may cause typical stimulant side effects including jitteriness, insomnia, and increased heart rate. It may interact with caffeine-sensitive medications and enhance effects of other stimulants. Pregnant and breastfeeding women should limit intake due to caffeine content. Individuals with heart conditions or anxiety disorders should consult healthcare providers before use.
