Why do I feel jittery after taking vitamins?
                                
                                
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                                    5 min read                                
                            
                                Recent studies and anecdotal evidence suggest that high doses of certain vitamins, especially B-complex, can act as metabolic stimulants, potentially leading to feelings of anxiety and restlessness. This jittery sensation is a more common side effect than many people realize and can be caused by a variety of factors related to how and what you are taking.