What's the Most Caffeinated Drink Ever?
                                
                                
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                                    5 min read                                
                            
                                According to the FDA, up to 400 mg of caffeine daily is safe for most healthy adults, yet some beverages far exceed this amount in a single serving. For those seeking an extreme jolt, pinpointing the single most caffeinated drink can be tricky as the answer changes depending on whether you measure by total content or density.