Why Do I Feel So Weird After Taking Vitamins?
                                
                                
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                                    4 min read                                
                            
                                According to the National Institutes of Health, while generally safe, multivitamins can sometimes cause side effects, with gastrointestinal issues being among the most common. If you've ever thought, "Why do I feel so weird after taking vitamins?", you're not alone, and the reasons can range from how you take them to the specific ingredients.