Ilex paraguariensis (Yerba Mate): A Narrative Review of Bioactive Compounds, Biological Activities, and Green Extraction Technologies

Your morning coffee might have a leafy rival—one packed with antioxidants and caffeine, yet wrapped in a steaming cup of tradition. But does yerba mate actually deliver on its health promises, or is it just another wellness myth?

Yerba mate, a beloved South American brew, is more than a caffeine kick. Its leaves harbor caffeoylquinic acids, methylxanthines, flavonoids, and saponins—a chemical arsenal that has sparked decades of research. Yet, with so many claimed benefits, scientists have struggled to separate hype from hard evidence.

This review, covering studies from 2015 to 2026, sifted through thousands of papers to find the strongest signals. The clearest support points to antioxidant and anti-inflammatory activity, plus possible effects on lipids, blood sugar, and body weight. But most of this evidence comes from lab dishes and animal models, not robust human trials.

Human studies are scarce, short, and wildly inconsistent in dose and formulation. Safety, meanwhile, hinges on how much caffeine you consume, how hot you drink it, and whether contaminants sneak in during processing. Drinking scalding mate or inhaling smoke-derived polycyclic aromatic hydrocarbons are avoidable risks.

The verdict? Yerba mate shows promise as a functional beverage, but therapeutic claims are premature. For now, enjoy it responsibly—mind the temperature, watch your caffeine, and wait for better science to brew.

Key Points

• Yerba mate's strongest evidence: antioxidant, anti-inflammatory, metabolic effects.
• Human studies limited, short, and heterogeneous in dose.
• Safety depends on caffeine, temperature, contaminants, and medication use.