Which food has the most niacin? Surprising sources and what you need to know
                                
                                
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                                    4 min read                                
                            
                                According to the NIH, all tissues in the body convert niacin into its main metabolically active form, the coenzyme nicotinamide adenine dinucleotide (NAD). But which food has the most niacin? While organ meats often top the list for natural sources, fortified products and certain concentrated plant-based ingredients can provide surprisingly high levels in a single, small serving.