What is the problem with guarana?
                                
                                
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                                    4 min read                                
                            
                                According to research, guarana seeds contain between 2.5% and 7.0% caffeine by weight, significantly higher than coffee beans which contain only 1–2%. This potent stimulant content is the primary factor behind many of the problems associated with guarana, especially when consumed in excessive amounts through energy drinks or dietary supplements.