How long does it take for B complex to start working?
                                
                                
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                                    5 min read                                
                            
                                According to a systematic review published in 2019, B-complex supplements may boost mood and reduce symptoms of depression and anxiety. For many people, the pressing question is **how long does it take for B complex to start working?** The answer varies, depending on individual health status, the severity of any existing deficiency, and the specific B vitamin in question.