What's 500 mg of magnesium too much?
                                
                                
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                                    4 min read                                
                            
                                According to the NIH Office of Dietary Supplements, the Tolerable Upper Intake Level (UL) for supplemental magnesium in adults is 350 mg per day. A 500 mg dose therefore exceeds this official threshold, increasing the risk of adverse side effects, particularly for those with underlying health conditions.