Herbs (Global Traditional) · South American
Yerba Mate (Ilex paraguariensis) (Ilex paraguariensis)
Moderate Evidencebotanical
Hermetica Superfood Encyclopedia
Yerba mate contains caffeine (0.7-1.7% dry weight) and polyphenols that provide stimulant effects through adenosine receptor antagonism and antioxidant activity. The herb demonstrates catalase-like activity with IC50 values of 2.52 mg/mL in DPPH assays.
Yerba Mate is derived from the leaves and stems of Ilex paraguariensis, a perennial shrub native to South America, particularly Argentina, Brazil, Paraguay, and Uruguay. The plant is harvested, roasted by direct fire, dried under hot air, milled, aged for sensory attributes, and packaged for use as a tea beverage. It contains xanthine alkaloids (caffeine 0.7-1.7% dry weight, theobromine, theophylline) alongside polyphenols like chlorogenic acids and flavonoids.
The research dossier reveals no specific human clinical trials, RCTs, or meta-analyses with PubMed PMIDs on Yerba Mate. While general references note potential stimulant, antioxidant, antimicrobial, and diuretic activities, these are not tied to human trials, indicating a significant gap in clinical evidence.
No clinically studied dosage ranges are available as human trials are absent. Traditional use involves infusions from dried leaves/stems, with variable bioactive compound transfer (14-50% of minerals extracted into infusions). Spray-dried extracts show high polyphenol content (178 mg/g total phenolics), but no dosing protocols have been established. Consult a healthcare provider before starting any new supplement.
Yerba Mate (Ilex paraguariensis) dried leaf composition per 100g dry weight: Moisture 8-10g, Protein 10-13g (moderate bioavailability; contains all essential amino acids including leucine ~0.8g, lysine ~0.6g), Total Carbohydrates 40-50g, Dietary Fiber 20-28g (predominantly insoluble cellulose and hemicellulose; limited fermentability data), Fat 4-6g (primarily linoleic and linolenic acids). Key Bioactive Compounds: Methylxanthines - Caffeine 0.7-1.7g/100g dry weight (primary stimulant alkaloid), Theobromine 0.1-0.5g/100g, Theophylline trace amounts <0.05g/100g. Polyphenols (total phenolic content 80-150mg GAE/g dry extract): Chlorogenic acids dominant - 3-caffeoylquinic acid (neochlorogenic), 5-caffeoylquinic acid (chlorogenic acid) collectively 50-120mg/g dry extract; Rutin (quercetin-3-rutinoside) 4-16mg/g; Quercetin 1-5mg/g; Kaempferol glycosides ~2-4mg/g; Dicaffeoylquinic acids (3,4-, 3,5-, 4,5-isomers) collectively 10-30mg/g. Saponins (ursolic and oleanolic acid derivatives) 3-7g/100g dry weight - may reduce cholesterol absorption and affect gut permeability. Minerals: Potassium 700-900mg/100g, Magnesium 200-280mg/100g, Manganese 40-80mg/100g (notably high; chronic excessive intake may pose neurotoxicity risk), Iron 35-50mg/100g (non-heme; bioavailability reduced by polyphenol binding, estimated <5% absorption), Calcium 600-700mg/100g, Zinc 2-4mg/100g, Phosphorus 90-120mg/100g. Vitamins: Vitamin C 10-20mg/100g dry leaf (significantly degraded during hot water infusion >80°C), Vitamin B1 (Thiamine) 0.5-0.9mg/100g, Vitamin B2 (Riboflavin) 0.8-1.2mg/100g, Vitamin B3 (Niacin) 5-8mg/100g, Vitamin E (tocopherols) 2-5mg/100g. Prepared infusion (1L brewed at 70-80°C, standard 50g herb): Caffeine 150-300mg/L, Total polyphenols 600-1200mg GAE/L, Potassium ~300-400mg/L - bioavailability of water-soluble compounds (methylxanthines, chlorogenic acids) is relatively high (estimated 60-80% extraction efficiency); fat-soluble compounds poorly extracted into aqueous infusion. Note: Smoke-dried (traditional) preparations may contain polycyclic aromatic hydrocarbons (PAHs) including benzo[a]pyrene; air-dried preparations present significantly lower PAH burden.
Yerba mate's caffeine content (0.7-1.7% dry weight) blocks adenosine A1 and A2A receptors, preventing drowsiness and promoting alertness. The high polyphenol content, including chlorogenic acids and saponins, provides antioxidant activity through free radical scavenging and catalase-like enzyme activity. These compounds work synergistically to reduce oxidative stress while maintaining central nervous system stimulation.
Current evidence for yerba mate comes primarily from in-vitro studies demonstrating antioxidant activity with IC50 values of 2.52 mg/mL in DPPH assays. Stimulant effects are supported by mechanism-based evidence through its documented caffeine content and adenosine receptor antagonism. Human clinical trials are limited, with most benefits extrapolated from traditional use and preliminary laboratory studies. More controlled human studies are needed to establish therapeutic dosages and clinical efficacy.
Yerba mate may cause caffeine-related side effects including insomnia, anxiety, increased heart rate, and digestive upset. It can interact with stimulant medications, blood thinners, and MAO inhibitors due to its caffeine and polyphenol content. Pregnant and breastfeeding women should limit intake due to caffeine content. Long-term consumption of very hot yerba mate preparations has been associated with increased esophageal cancer risk in some populations.
