Nearly 9 in 10 ‘Avocado Oil’ Products Flunk Authenticity Test

That bag of avocado oil potato chips in the pantry might not hold what its label promises. A new study from the University of California, Davis found that 89% of snack foods, mayonnaises, and salad dressings labeled as containing avocado oil had a chemical makeup inconsistent with the real thing, raising a pointed question about whether shoppers are paying for something they never actually get.

Avocado oil has boomed in popularity as buyers reach for alternatives to conventional vegetable oils. Food companies noticed and “made with avocado oil” now appears on chip bags, mayo jars, and dressing bottles, usually at a noticeable markup. A front-of-package oil claim tends to signal “premium” to a shopper, so it carries real weight. UC Davis researchers decided to put those claims to the test, and the numbers came back badly for the industry.

Of 74 products purchased from California retail stores and online, 89% of avocado oil products showed fatty acid and sterol profiles that did not match those of authentic avocado oil, according to the findings published in the journal Applied Food Research. Olive oil products told a very different story: 90% of olive oil chips passed, and every olive oil dressing and mayonnaise tested genuine.

How Researchers Tested the Avocado Oil Claims

Researchers zeroed in on three product types in which avocado and olive oils are sold as premium ingredients: chips, mayonnaise, and salad dressings. Those categories cover very different foods, one fried at high heat, one a creamy spread, one a pourable liquid, which let the team check authenticity across a range of real-world conditions. Only products listing a single oil, with no other edible oils in the ingredients, made the cut. A few plain vegetable oil products were also collected as a chemical reference point. In all, 74 products were analyzed: 28 avocado oil chips, 12 avocado oil dressings, 14 avocado oil mayonnaises, 10 olive oil chips, 6 olive oil dressings, and 4 olive oil mayonnaises. Two separate production runs of each product were purchased, and each was tested twice to catch batch-to-batch differences.

Pulling the fat out of a chip or an emulsified mayo is no small job. Once extracted, each oil was measured for two chemical fingerprints: its fatty acid composition and a set of naturally occurring plant compounds called sterols, which reliably distinguish oil types. Those profiles were then checked against internationally recognized Codex Alimentarius standards, which are designed to accommodate the natural variation found in real avocado and olive oil. Small, single-marker deviations were forgiven; only broader patterns counted as a failure.

Why Avocado Oil Labels Failed So Often

Breaking the results down by product paints a grim picture. Among avocado oil chips, 93% were inconsistent with the real oil. Every avocado oil dressing failed, a 100% miss rate. Mayonnaise did a little better, with 71% classified as inconsistent.

Failing products carried the fingerprint of cheaper substitutes. Authentic avocado oil has its own signature levels of certain fats, and the failing samples flipped that pattern, looking far more like common vegetable oils such as soybean or canola. One fat in particular, cis-vaccenic acid, was a dead giveaway. Real avocado oil has a good amount of it. The products that failed had far less, about the same as a plain vegetable oil.

One sample went beyond mere dilution. Its fatty acid and sterol profile matched soybean oil, not avocado oil at all, a sign that soybean oil may have been swapped in wholesale rather than used to stretch a smaller amount of the genuine article. Even brand loyalty offered no guarantee. One company sold both avocado-oil and olive-oil potato chips; neither avocado-oil version passed, while one of its olive-oil chips did.

Why Olive Oil Held Up Better

Olive oil claims survived the same scrutiny far more comfortably, with nearly every product matching authentic olive oil. Researchers credit olive oil’s much longer regulatory track record: international standards are well established, and oversight of the olive oil market is more developed than that governing avocado oil, a newer arrival on the premium shelf. That oversight gap may be leaving more room for cheaper oils to slip into avocado oil products unnoticed.

Cooking cannot explain away the results either. A fair objection is that high-heat frying, or the mixing that makes mayonnaise, might warp an oil’s chemistry enough to make real oil look fake. To settle it, researchers made their own chips and mayonnaise in the lab using verified, pure avocado and olive oil, then analyzed the fat. Changes were tiny, far too small to account for the huge deviations seen on store shelves. Frying nudged the key markers by a fraction of a percent, and making mayonnaise moved them even less.

Does a Higher Price Mean Real Avocado Oil?

For anyone assuming a bigger price tag buys peace of mind, the data offer a reality check. Avocado oil products generally cost more per ounce than comparable vegetable oil versions, yet paying more guaranteed nothing. Some of the cheapest avocado oil products in the study were among the rare few that passed, while pricier options failed. Certification was scarce too: only two olive oil dressings in the study carried any third-party verification at the time of purchase.

Consistency was shaky even within a single product. For the two avocado oil chips that passed, only one of the two production runs collected actually cleared the bar; the other run failed. A product made with real avocado oil one month may not be the next, likely because manufacturers source the same ingredient from multiple suppliers.

Study authors point to a blind spot in food oversight: oil fraud in processed foods receives little attention, since most testing focuses on bottles of oil sold directly to consumers. Buried inside a multi-ingredient product, an oil is harder to catch, harder to police, and easier to fake. Until clearer standards and stronger enforcement reach the processed food aisle, the label on that chip bag may be worth a lot less than it promises.

Disclaimer: This article summarizes findings from a peer-reviewed study for general informational purposes and is not intended as dietary, medical, or purchasing advice. The research analyzed a limited set of products purchased in California in 2025 and 2026 and reflects only the specific lots tested; results may not represent every product, brand, or production batch. Product authenticity can vary over time. Readers with questions about a specific product should consult the manufacturer or a qualified professional.

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