Can I consume 400 mg of caffeine at once?
                                
                                
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                                    3 min read                                
                            
                                For most healthy adults, a daily caffeine intake of up to 400 mg is considered safe by health authorities. However, the crucial question for many is not about the daily total, but rather: **can I consume 400 mg of caffeine at once?** This high-dose, single-sitting consumption can lead to immediate and unpleasant side effects that differ significantly from a moderate, spread-out intake.