UC Davis Study Reveals Widespread Adulteration in Avocado Oil Products
Every salad dressing and mayonnaise product labeled as containing avocado oil in a new UC Davis study failed purity testing. Researchers found that manufacturers consistently adulterated these products with cheaper oils, while 93% of avocado oil-labeled chips similarly failed to meet basic standards for ingredient integrity.
The 2026 findings follow a landmark 2020 study from the same institution, which first highlighted systemic issues within the category. This time, researchers utilized Marianne’s avocado oil as the benchmark for 100% purity, measuring all other products against its composition. The results underscore a growing gap between consumer expectations and the reality of processed goods on store shelves.
Most industry players currently rely on loose testing standards that allow products to contain up to 40% adulterants while still passing. In contrast, Marianne’s employs a more rigorous protocol, testing every batch against fatty acid profiles, sterol composition, and tocopherol levels. Registered dietitian Toby Amidor noted that these findings represent a significant breach of consumer trust, as shoppers pay premium prices for oils they believe are pure. For those seeking transparency, the full dataset from the UC Davis research is now available to the public.
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