This paper shows that guarana is more than an energy-drink stimulant: across human, animal, and laboratory evidence it emerges as a biologically active compound with signals in cognition, metabolism, fatigue, and oxidative stress, but with clear safety concerns when pushed into high-stimulant or mixed-product use. The full read is worth it because it separates where guarana itself looks genuinely promising, where the signal comes mainly from guarana-containing formulations, and where the real clinical and toxicologic limits begin.
Abstract: The aim of this review is to synthesize the current scientific literature regarding the biological activities, clinical efficacy, and safety profile of guarana across human, animal, and in vitro models. The review utilises 167 original studies with 251199 total participants (topic deduplicated ΣN). The evidence map suggests that guarana has its clearest human signals in acute cognitive performance and metabolic regulation, alongside notable safety concerns at higher stimulant exposures. In particular, guarana-containing interventions were associated with body fat reductions of 5.53% at 4 weeks and 15.6% at 12 weeks in one formulation study, while delayed gastric emptying and weight loss of about 5.1 kg over 45 days were reported in overweight adults using a South American herbal preparation. Across experimental and translational studies, these effects are supported by a plausible mechanistic profile involving methylxanthines, polyphenols, antioxidant activity, adipogenesis inhibition, and modulation of lipid and carbohydrate metabolism. Clinically, this supports a potential role for guarana in short-term cognitive support, exercise-related performance, and selected fatigue or weight-management settings, but also reinforces the need for caution in people at cardiovascular or neurologic risk because serious adverse events have been reported with guarana-containing stimulant products. The next phase of research should prioritize standardized guarana-only preparations, dose-ranging pharmacokinetic and safety studies, and adequately powered longer-term randomized trials that can distinguish guarana-specific benefits from those of caffeine and multi-ingredient formulations.
Final search date and database lock: 2026-03-29 00:28:15 CET
Plan: Pro (expanded craft tokens; source: PubMed)
Source: PubMed
Total Abstracts/Papers: 343
Downloaded Abstracts/Papers: 343
Included original and non-original Abstracts/Papers (all): 202
Included original Abstracts/Papers (Vote counting by direction of effect): 167
Reference Index (links used in paper): 161
Total participants (topic deduplicated ΣN): 251199
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