What Does a Niacin Flush Feel Like?
                                
                                
                                •
                                
                                
                        
                                    
                                    4 min read                                
                            
                                Over 90% of individuals taking high doses of immediate-release niacin supplements will experience a niacin flush. This temporary but intense reaction can be startling if you don't know what to expect, leaving many to wonder, what does a niacin flush feel like? The sensation is a direct result of blood vessel dilation and typically presents as a hot, prickly, and itchy feeling on the skin.