How long does it take to fix B3 deficiency?
                                
                                
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                                    3 min read                                
                            
                                With proper treatment, most people begin to see improvement from vitamin B3 (niacin) deficiency symptoms within a few days. The exact timeline for how long it takes to fix B3 deficiency, also known as pellagra in severe cases, depends on the severity of the condition and the individual's overall health and response to supplementation.