Why is my multivitamin giving me diarrhea? Understanding the culprits
                                
                                
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                                    6 min read                                
                            
                                According to studies, gastrointestinal issues like diarrhea and upset stomach are among the most commonly reported side effects of multivitamins. If you find yourself asking, "Why is my multivitamin giving me diarrhea?" it's important to understand the common factors at play, including high dosages and sensitive ingredients.