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Researchers found that of the products tested, 93% of chips, 71% of mayonnaises and 100% of salad dressings labeled as authentic avocado oil contained other oils.
by Amy Quinton July 15, 2026

If you've been reaching for chips, mayonnaise or salad dressing labeled "made with avocado oil," there's a good chance the oil inside isn't pure avocado oil, despite it being the only listed oil ingredient. University of California, Davis, researchers tested processed foods marketed as containing avocado oil. They found 48 of the 54 avocado oil-labeled products were adulterated with cheaper oils. The study was published in Applied Food Research.

Researchers purchased the products in 2025 and 2026 from online retailers and California stores. They represent only a portion of the avocado oil processed food market.

"Consumers are increasingly paying a premium for products made with avocado oil or olive oil,” said lead author Selina Wang, Professor of Cooperative Extension in the UC Davis Department of Food Science and Technology. "They deserve to get what they pay for and food manufacturers deserve confidence that the ingredients they purchase from suppliers are authentic."

Researchers found that of the products tested, 93% of chips, 71% of mayonnaises and 100% of salad dressings labeled as authentic avocado oil contained other oils. By contrast, when researchers applied the same purity tests to 20 olive oil-labeled processed foods, only one failed.

The gap between avocado and olive oil results reflects the fact that olive oil authenticity has been studied, tested and scrutinized for decades. Avocado oil is a relatively new and expensive product category and has not been monitored at the same level. As a result, consumers have less protection against misleading labels.

This is the latest in a series of UC Davis findings on the authenticity of avocado oil. A 2020 study found 82% of commercial bottled avocado oil were either rancid or mixed with other oils. A later study found 70% of private label oils were rancid or adulterated.

Researchers measure fatty acids and sterols — chemical “fingerprints” unique to each oil — to verify authenticity. One potential concern is that processing, such as deep frying, blending or emulsifying, can change those chemical fingerprints. Wang’s team tested that directly and found fatty acids and sterols changed minimally. The study also used conservative criteria when evaluating authenticity.

“In our experience we’ve noticed natural variables, such as geographic origin and avocado variety, can change these fingerprints,” said Wang. “So we gave the samples some wiggle room, giving them a 10% margin of deviation to account for that, but 89% of the avocado products still failed.”

Wang said brands whose products failed may not know they are using adulterated oil. Many food companies source their oils from third-party brokers or from several different suppliers. Without rigorous testing, food companies may never detect adulterated oil. Wang said the adulteration likely originates with oil suppliers.

"If consumers are buying potato chips that say they’re made with 100% avocado oil, that should be the product that they're getting,” noted Wang. “I don't think there is enough accountability throughout the supply chain. Suppliers of adulterated oil may be hiding behind a couple of layers of supply chain, making it difficult to identify where the problem originated.”

Wang said at the same time, food companies could do more to monitor and verify the authenticity of the oil they purchase.

Consumers face the same outcome either way: They pay premium prices for products that aren’t what they claim to be. Avocado oil products in the study were priced comparably to olive oil products or higher — yet olive oil products were overwhelmingly pure while avocado oil products were overwhelmingly not.

Grocery stores now stock far more avocado oil products than they did just a few years ago. Chips, mayonnaise and salad dressings "made with avocado oil" now occupy prime real estate in major grocery chains, marketed in many cases to consumers who are intentionally trying to avoid other oils. Wang's data suggests most of those consumers are not getting what they pay for.

Other authors of the study include Natalie Lopez-Alvarez, Xueqi Li and Benjamin Vizgordiski. The study received no outside funding.

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Originally posted by konata88:
If true, there are CEO's that need to be removed from office and criminally charged. The buck stops with them.

This seems to focus on products made with avocado oil (ie - chips). But what about just plain avocado oil (ie - Marianne's sold at costco)?

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If true, there are CEO's that need to be removed from office and criminally charged.

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There is, apparently, no legal definition of Avocado oil.

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Originally posted by egregore:
OK, so avocado oil might not be 100% pure. But the article doesn't say what other oils, or what percentage of them the avocado oil actually contains.

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Originally posted by Aglifter:
Highly unlikely the U.S. company is knowingly lying on the ingredient label. That is a major issue and can result in handcuffs.

Adulterated food is a serious issue, but it’s also just straight fraud.

(At least in dairy, NO ONE adulterates it. At least not if you’re sane.)

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chips, mayonnaises and salad dressings

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Originally posted by Georgeair:

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chips, mayonnaises and salad dressings

Why do I care about the smoke point in a prepared product?

If this were a test of an actual bottle of avocado oil, I can see the indignation.

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Originally posted by trapper189:
What do the labels of these products say?

If a bag of chips says it's made with avocado oil and the ingredient list says avocado oil and list 50 other types of oil, then the label would be truthful.

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Originally posted by trapper189:
I'm not knowledgeable enough to understand the test methods, but could the discrepancy be due to residual oil? A company making potato chips probably makes a variety of them. It's likely the varieties are made with the same equipment, but in different batches. Is it possible when a kettle of olive oil is emptied and avocado oil is poured in that some olive oil remains? Would that affect these tests?

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Originally posted by 229DAK:
If the product simply says "Made with Avocado Oil", then I do not expect 100% avocado oil.