Yerba Mate Extract

Won't boost muscle strength — a clinical trial found zero difference vs. placebo. No proven fat-burning effect on its own; any thermogenic effect seen in studies came from multi-ingredient blends with high caffeine, not yerba mate alone. No human evidence it fights cancer, prevents Alzheimer's, or kills Salmonella in your gut. Lab results don't automatically translate to benefits in people.

• Genotoxicity concern: In vitro studies found yerba mate extract caused DNA damage, micronuclei formation, and cell death in human lymphocytes at tested concentrations — partly attributed to its caffeine content.
• Cancer risk association: Yerba mate consumption has been linked in prior literature to increased risk of certain cancers (noted in the genotoxicity paper), though this is not fully resolved.
• Thermogenic products often combine yerba mate with high-dose caffeine (340 mg in one study), making it impossible to attribute effects to yerba mate specifically — watch for proprietary blends that hide individual doses.
• Animal study showed yerba mate decreased body weight in chickens and interfered with probiotic effectiveness — potential interactions with gut health supplements.
• Aluminum content: Yerba mate plants grown in acidic soils absorb aluminum, a neurotoxic metal. One study measured aluminum in extracts and found behavioral changes in worm models with long-term exposure.