According to ConsumerLab.com, there was only one major olive oil you could trust: “California Olive Ranch 100% California Extra Virgin Olive Oil.”
Like just about every other major corporation I hate Costco's politics, but I like their Olive Oil. I actually prefer the flavor of their normal Italian Extra Virgin, but the Kirkland Signature, Organic Extra Virgin Olive Oil, 2 L Item 692731 is suppose to have more of the good stuff that supposedly makes olive oil good for you. It has been tested by multiple organizations and found to be legit.