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If it’s over 6 months old, it isn’t giving you the same nutritional punch. According to the Journal of Food Science, the disease-fighting antioxidants in olive oil are 40% less effective 6 months after the bottle is opened. And that’s true even if you’re storing it properly in a cool, dark place. So only buy small bottles of olive oil. That way they won’t sit around, and you’ll get a full dose of antioxidants.