Can niacin cause an allergic reaction? Differentiating Allergy from Niacin Flush
                                
                                
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                                    4 min read                                
                            
                                While the distinctive niacin flush is a common, non-allergic side effect of high-dose niacin supplementation, severe allergic reactions, although rare, can occur. Understanding the difference between these two types of reactions is crucial for anyone taking vitamin B3 supplements, especially for managing cholesterol.