Part VIII — Does Extra Virgin Olive Oil Contain Heavy Metals, Microbes, or Allergens? | PJ Kabos Guide
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PJ Kabos Guide to Olive Oil — Part VIII
This article is Part VIII of the PJ Kabos Guide to Olive Oil — where ancient olive-growing wisdom meets modern science, your guide to choosing, tasting, and enjoying exceptional extra virgin olive oil — especially high-phenolic varieties, in which we specialize. We hope it inspires you in your olive-oil journey.
In this article, we take a closer look at what may — or may not — be present in olive oil, and how this is both understood and tested.
A Thoughtful Question
Recently, a customer wrote to us with a thoughtful and important question.
Her niece is sensitive to heavy metals, toxins, and allergens, and she wanted to be absolutely sure that the olive oil she was choosing was safe.
We were deeply grateful for her message — because while many of these concerns are well understood within the world of olive oil, they are not always clearly explained or written about.
And they matter.
When we say; "PJ Kabos High-Phenolic Extra Virgin Olive Oil: your trusted oil, straight from our table to yours," this is something we take seriously. We only bring to you a product we ourselves use and trust.
While we obviously understand the finer workings of olive oil and cannot easily be misled, we often find ourselves asking similar questions about other foods we bring to our own table—for instance honey or cocoa.
Takeaway:
The desire to choose good quality products—and to choose safely—is a concern we all carry.
The Simplicity of Extra Virgin Olive Oil
Something that has to be remembered is that extra virgin olive oil is one of the purest foods we can bring into our kitchens and tables. Extra virgin olive oil is, in its essence, remarkably simple.
It is the juice of the olive fruit — obtained by mechanical means, without refining, without additives, and without chemical processing.
Because of this, it differs in an important way from many other foods: It is not a manufactured product, but an extracted one.
This distinction plays a quiet but important role in its safety.
Takeaway:
By its very nature, extra virgin olive oil carries a natural clarity — one that quietly supports both its purity and its safety.
Are there Heavy Metals in Extra Virgin Olive Oil?
Concerns about heavy metals — such as lead, cadmium, mercury, and arsenic — are understandable in today’s world.
In the case of extra virgin olive oil, however, their presence is not typical.
Olive trees draw from the soil, but the oil itself is separated from the water-based components of the fruit where many contaminants, if present, would tend to remain. When olives are grown in clean environments and handled properly, the resulting oil is generally free from these substances.
This also highlights the importance of choosing a producer with a clear history of transparency, trust, and single-origin sourcing.
Laboratory analysis, when performed, often confirms this expectation.
Takeaway:
In well-produced extra virgin olive oil, the presence of heavy metals is not expected—and when tested, this is generally confirmed.
Certificate of Analysis (COA) for Extra Virgin Olive Oil
The following laboratory analysis offers a clear example of what is typically found when extra virgin olive oil is tested for heavy metals and microbiological activity, including yeasts, moulds, and common bacteria.
Quick Guide to Reading This COA
At first glance, a certificate of analysis such as this — issued on March 5, 2026, for our PJ Kabos Family Reserve Organic High-phenolic Extra Virgin Olive Oil Robust (the black bottle)—may appear technical. Yet its meaning is quite easy to understand.
First, under “Metals,” elements such as arsenic, lead, cadmium, and mercury are listed as "not detected.” This is exactly what we would expect to see.
We then come to the microbiological section, where you may notice results such as:
E. coli → <1
Yeasts → <1
Moulds → <1
At first, this notation can seem unclear. Does it mean the oil contains a little bit of something? And what does the “1” represent? In fact, it reflects the limits of measurement rather than the presence of concern while “<1” indicates that the level is below the detection threshold of the testing method.
In practical terms, it means that these microorganisms are not present in any measurable way.
Salmonella is also shown clearly in the above COA as “not detected.”
Together, these results reflect what is typically expected of properly produced extra virgin olive oil.
Takeaway:
When read with understanding, a certificate of analysis (COA) offers something simple: clarity, reassurance, and a quiet confirmation of what extra virgin olive oil is by its nature.
Why Microorganisms Do Not Thrive in Olive Oil
Extra virgin olive oil is not a hospitable environment for microbial life.
This is due to several inherent characteristics:
It contains very little water, and microorganisms require water to grow.
It is composed primarily of fats, which do not support microbial activity.
It contains natural compounds — often referred to as phenolics — which contribute to its stability.
Together, these factors create conditions in which harmful bacteria and moulds do not readily develop.
Takeaway:
Low water content, natural compounds, and its fat composition together make extra virgin olive oil an environment where microorganisms do not readily develop.
A Note on Allergens
Pure extra virgin olive oil contains only one ingredient: olives.
It does not naturally contain common allergens such as:
Soy
Wheat
Dairy
Nuts
Because extra virgin olive oil is a single-ingredient food, it is not generally associated with common allergens. In simple terms, if a person is not allergic to olives, the oil itself would not be expected to pose a concern.
However, for individuals with sensitivities — especially children — it is completely understandable to seek confirmation. Testing for specific allergens can also be carried out if desired.
Takeaway:
In its simplicity, extra virgin olive oil does not naturally carry the allergens found in more complex foods.
On Testing and Verification
In many cases, the safety of extra virgin olive oil in heavy metals, microbes, and allergens is assumed within the field. However, when testing is carried out, the results tend to confirm what the nature of the oil itself already suggests:
Heavy metals are not detected.
Pathogenic bacteria are not detected.
Microbial activity, when measured, falls below detectable limits.
Testing, then, serves not so much to reveal something unexpected, but to make visible what is already inherent.
Takeaway:
In the end, testing simply confirms what good-quality extra virgin olive oil is by its very nature, a pure, one-ingredient product.
A Quiet Confidence
There is something reassuring in understanding how a food behaves by its very nature.
In returning to the desire to choose a safe extra virgin olive oil for our family, we find that the answer is not complicated, but quietly reassuring. It is, perhaps, one of the reasons extra virgin olive oil has been trusted for so long.
Takeaway:
Understanding the nature of extra virgin olive oil helps us choose it not only with knowledge, but with confidence.
Frequently Asked Questions
DOES EXTRA VIRGIN OLIVE OIL CONTAIN HEAVY METALS?
Extra virgin olive oil is not typically a source of heavy metals. When tested, elements such as lead, cadmium, mercury, and arsenic are generally not detected, especially when olives are grown and processed in clean conditions.
WHAT DOES “<1” MEAN ON A LABORATORY REPORT?
The notation “<1” (less than one) indicates that the level of a substance is below the detection limit of the testing method. In practical terms, it means that it is not present in any measurable way.
CAN BACTERIA GROW IN EXTRA VIRGIN OLIVE OIL?
Extra virgin olive oil is not a hospitable environment for microbial growth. Its low water content, fat composition, and natural compounds make it difficult for harmful bacteria and microorganisms to develop. For this reason, oil has long been used as a means of preserving foods — an understanding that predates modern science.
DOES EXTRA VIRGIN OLIVE OIL CONTAIN ALLERGENS?
Pure extra virgin olive oil contains only one ingredient: olives. It is not generally associated with common allergens such as soy, wheat, dairy, or nuts.
According to the European Food Safety Authority (EFSA), food allergens are typically protein-based substances. Extra virgin olive oil, by contrast, is composed primarily of fats and does not contain these proteins. For this reason, it is not considered a typical source of allergens.
DO PHENOLIC COMPOUNDS IN OLIVE OIL PLAY A ROLE IN ITS STABILITY?
Yes. Phenolic compounds, which occur naturally in extra virgin olive oil, contribute not only to its flavor and aroma and health benefits but also to its stability.
These compounds are part of what helps create an environment in which microbial activity is not easily supported. They are also associated with the protective qualities often attributed to high-quality olive oil.
ARE POLYPHENOLS IN OLIVE OIL GOOD FOR YOU?
Polyphenols in extra virgin olive oil are widely studied for their antioxidant and health-supporting properties.
These compounds can help neutralize free radicals and may support the body’s natural defenses against oxidative stress. Researchers are also studying how olive oil phenols may influence inflammation, cardiovascular health, and other biological processes.
Because of these properties, diets that include extra virgin olive oil — such as the Mediterranean diet—are often associated with positive health outcomes.
IS IT SAFE TO CONSUME EXTRA VIRGIN OLIVE OIL DAILY?
Yes. Extra virgin olive oil has been consumed safely for centuries and is widely regarded as a foundational component of traditional diets, particularly in Mediterranean regions.
Used in everyday cooking, drizzled over foods, or even taken in small amounts on its own, it forms part of a balanced and varied way of eating.
Its long history of use, along with its natural composition, contributes to the confidence with which it is enjoyed daily today all over the world.
The Most Recent Harvest (2025–26)
Please note: Phenolic levels and profiles vary with each harvest.
Extremely High-Phenolic Organic Extra Virgin Olive Oil
Phenols: 995 mg/kg (HPLC), at production
Hydroxytyrosol (& derivatives): 14+ mg/20 g (far above the EU health claim threshold)
USDA Organic
Kosher
Primary Use: Daily Phenolic Shot
Secondary Use: Finishing, Vinaigrettes
Taste Intensity: Robust +
Very High-Phenolic Organic Extra Virgin Olive Oil
Phenols: 699 mg/kg (HPLC), at production
Hydroxytyrosol (& derivatives): 10+ mg/20 g (well above the EU health claim threshold)
USDA Organic
Kosher
Primary Use: Daily Phenolic Shot, Finishing
Secondary Use: Baking, Cooking
Taste Intensity: Robust
High-Phenolic Organic Extra Virgin Olive Oil
Phenols: 400+ mg/kg (HPLC), at production
Hydroxytyrosol (& derivatives): 7+ mg/20 g (more than meets the EU health claim threshold)
USDA Organic
Kosher
Primary Use: Finishing & Cooking
Secondary Use: Daily Phenolic Shot
Taste Intensity: Medium
High-Phenolic Extra Virgin Olive Oil
Phenols: 400+ mg/kg (HPLC), at production
Hydroxytyrosol (& derivatives): 5+ mg/20 g (meets the EU health claim threshold)
No Pesticides
Kosher
Primary Use: Finishing & Cooking
Secondary Use: Daily Phenolic Shot
Taste Intensity: Medium
Extra Virgin Olive Oil
Phenols 250-300 mg/kg (HPLC), at production
Hydroxytyrosol (& derivatives): 3+ mg/20 g (below the EU health claim threshold; still an excellent EVOO)
No Pesticides
Kosher
Primary Use: Cooking, Baking
Secondary Use: Finishing
Taste Intensity: Delicate
Contents
PJ Kabos Guide to Olive Oil
Where ancient olive-growing wisdom meets modern science, your guide to choosing, tasting, and enjoying exceptional high-phenolic extra virgin olive oil. We hope it inspires you in your olive-oil journey.
How olive oil quality is defined — and why the difference matters for taste, health, and daily use.
Why extra virgin and high-phenolic olive oils shine in real-life cooking, from sautéing to roasting.
Your simple daily ritual for harnessing the powerful antioxidants in high-phenolic olive oil.
How phenolic compounds support heart, brain, metabolic, joint, and whole-body vitality across the years.
How cholesterol works — and how extra virgin olive oil supports balance and heart health.
A simple guide to the phenolic compounds in olive oil — what phenols and polyphenols are and why they contribute to olive oil’s flavor, stability, and potential health benefits.
VII. What Is a Daily Phenolic Shot of Olive Oil and What Is the EU “Health Claim” Concerning It? | PJ Kabos Guide
How phenolic content varies from oil to oil and from harvest to harvest — and how to choose an olive oil that meets the EU Health Claim.
VIII. Does Extra Virgin Olive Oil Contain Heavy Metals, Microbes, or Allergens? | PJ Kabos Guide
A clear look at whether extra virgin olive oil contains heavy metals, microbes, or allergens — and how its natural composition, along with laboratory testing, helps us understand what is — and is not — present.
Subscribe and stay tuned — more chapters coming soon.
Please enjoy having a look around our websites and PJ Kabos Amazon Store for more about our many high-phenolic olive oils, recipes, history, etc.
And follow along with us on Instagram for photos concerning olive oil production, our groves in Greece, articles about olive oil, family history and more.
Please note: This article is for informational purposes only and should not be considered medical advice. Consult a healthcare professional for personalized guidance regarding your health and medical conditions.
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