What Chemicals Do Onions Contain? A Deep Dive into Onion Composition
                                
                                
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                                    4 min read                                
                            
                                According to the National Onion Association, onions contain a variety of health-promoting phytochemicals, including flavonoids and organosulfur compounds. This complex chemical makeup is what gives onions their distinct flavor, aroma, and a range of potential health benefits, which vary depending on the onion's color and variety.