How long does 200mg of caffeine last in your system?
                                
                                
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                                    4 min read                                
                            
                                According to the U.S. Food and Drug Administration (FDA), a single 200mg dose of caffeine is generally safe for most healthy adults and provides a noticeable stimulant effect. However, the duration of this effect is not a one-size-fits-all answer, as it depends heavily on individual biological factors.