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A New Warning About Olive Oil

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Clearly, consuming spoiled oil (of any kind) will likely do more harm than good.

To protect the oil, Dr. Moerck recommends treating it with the same care as you would other sensitive omega-3 oils:

  • Keep in a cool, dark place
  • Purchase smaller bottles rather than larger to ensure freshness
  • Immediately replace the cap after each pour

To help protect extra virgin olive oil from oxidation, Dr. Moerck suggests putting one drop of astaxanthin into the bottle. You can purchase astaxanthin, which is an extremely potent antioxidant, in soft gel capsules. Just prick it with a pin and squeeze the capsule into the oil.

The beautiful thing about using astaxanthin instead of another antioxidant such as vitamin E, is that it is naturally red, whereas vitamin E is colorless, so you can tell the oil still has astaxanthin in it by its color.

As the olive oil starts to pale in color, you know it’s time to throw it away.

You can also use one drop of lutein in your olive oil. Lutein imparts an orange color and will also protect against oxidation. Again, once the orange color fades, your oil is no longer protected against rancidity and should be tossed.

This method is yet another reason for buying small bottles. If you have a large bottle, you may be tempted to keep it even though it has begun to oxidize.

The Worst Cooking Oils of All

Polyunsaturated fats are the absolute worst oils to use when cooking because these omega-6-rich oils are highly susceptible to heat damage.

This category includes common vegetable oils such as:

  • Corn
  • Soy
  • Safflower
  • Sunflower
  • Canola
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Read more: Basics, Diet & Nutrition, Eating for Health, Food, Health, Raw, , , , , , , , , , , , , ,

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Dr. Mercola

Dr. Mercola has been passionate about health and technology for most of his life. As a doctor of osteopathic medicine, he treated many thousands of patients for over 20 years. In the mid 90ís he integrated his passion for natural health with modern technology via the internet and developed a website, to spread the word about natural ways to achieve optimal health.


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9:50AM PDT on Jun 19, 2014

thanks for the cool suggestion.

2:04AM PDT on Jun 4, 2014


7:33PM PDT on May 24, 2014

I cook in organic olive oil or organic coconut oil :)

7:22PM PDT on May 24, 2014

Excellent. Very informative.

11:08PM PDT on May 19, 2014


11:36AM PDT on May 19, 2014

I appreciate this fairly new thinking. I do love the flavor of cooking with olive oil in Italian cuisine. I will definitely use coconut oil from now on for cooking other things.. It would probably be ok to use olive oil in Italian if I am careful not to cook at too high a temp just to add the flavor for sauces. I am well aware of all the benefits of the use coconut for many things such as coconut water, skin preparations certain recipes (etc).

I do, however agree with Judith M and Nicholas K for their knowledgeable comments

8:32AM PDT on May 19, 2014

Now, Dr. Mercola, let me tell YOU something about PALM OIL, starting with expressing my shock that you even mention it as a beneficial oil.

Are you not yet aware of the alarming environmental devastation that palm oil plantations cause to the rainforests? Palm oil is now a ubiquitous ingredient in so many foods and other products, that the demand for it is responsible for massive destruction of rainforests in order to establish palm oil plantations. In fact, the rainforests are vanishing before the bulldozer at such calamitous rate that indigenous animal species are now, in several cases, on the verge of extinction. ORANGUTANS are one of these severely endangered creatures. Their habitat is shrinking as I write this.

In future, please consider all the ramifications of anything you recommend in your "health" articles. Palm oil may or may not bring benefits to an individual human, but the industry that produces and supplies it is bringing about a very serious condition to the biosphere -- e.g., the health of the planet and ultimately, to us human inhabitants. If you care nothing for Orangutans and other sentient beings, at least consider how the rainforests benefit us and how a substance mentioned by you is NOT beneficial.

4:28AM PDT on May 19, 2014

Check before use

5:08PM PDT on May 18, 2014

What next! Will there be anything left for us to eat. "who know's" Thank-you for sharing,Theresa R. Thank's a Bunch for the article Dr. Mercola.

4:32PM PDT on May 18, 2014

Thank you! (Now goes sheepishly to put bottle of olive oil back in cabinet and off the counter.)

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Disclaimer: The views expressed above are solely those of the author and may not reflect those of
Care2, Inc., its employees or advertisers.

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