Which Costco Olive Oil Has the Most Polyphenols? A Kirkland Breakdown
                                
                                
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                                    4 min read                                
                            
                                According to independent lab tests, Kirkland Signature Organic Extra Virgin Olive Oil contains a moderate level of polyphenols, typically around 370 mg/kg. For shoppers focused on maximizing health benefits, the question of which Costco olive oil has the most polyphenols is crucial, requiring a closer look at the specific varieties available.