Products · Cooking oils & fats · Marianne’s Harvest
Marianne’s Harvest Classic Avocado Oil
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An avocado oil named pure and not oxidized in UC Davis’s 2020 test, now in two certifier listings and publishing lot results. It is refined, in dark glass, and Marianne’s does not say how it is refined.
Best for Cooks who want a neutral, high-heat avocado oil backed by the most purity evidence we found, and who accept a refined oil.
- Our quality rating
- Good (4 of 5)
- Price range
- Mid-range
- Verified marks
- Seed Oil Free Certified, Clean Label Project listing
- Size
- 16.9 fl oz (500 mL) dark glass bottle with a pop-up spout; a 2 L size is sold at Costco
- Made in
- Avocados from Mexico, Colombia, Peru and East Africa, depending on the harvest; made by Adams Group, California
approx. $17 for 16.9 fl oz (500 mL)
See it on Marianne’s Harvest’s site →We are not affiliated with Marianne’s Harvest. This link goes to the maker’s own page, with no tracking code. How we're funded.
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How we evaluated it
Why we chose it What put it on our list
- UC Davis tested 22 avocado oils and reported in June 2020 that “only two brands produced samples that were pure and nonoxidized”: Marianne’s Avocado Oil and Chosen Foods, both refined and made in Mexico.
- Two certifier listings are current. The Seed Oil Free Alliance lists Marianne’s Classic Avocado Oil 500 mL as certified (the brand since August 2025). Clean Label Project’s certified products list includes Marianne’s Avocado Oil 500mL, dated July 30, 2026. Marianne’s calls it a Purity Award.
- Marianne’s publishes results for every load of crude oil it received from November 2025 to August 2026, tested before the oil enters its facility for fatty acids, sterols and tocopherols against Codex ranges. The median was 59.9% oleic acid and 11.4% linoleic acid (the omega-6 fat).
- The 500 mL bottle is dark glass, per the maker’s FAQ and its product photo.
- It names where the avocados come from, by season: Mexico, Colombia, Peru, Kenya, Ethiopia and South Africa.
Trade-offs What to weigh before you buy
- The published numbers are Marianne’s own medians for incoming crude oil, not for finished bottles. It tests fatty acids in-house and says the sterol and tocopherol tests are third-party verified, but does not name the lab. UC Davis’s 2020 result is for the oil sold then. UC Davis’s 2026 news page names no brand, and its list of the foods tested does not include Marianne’s. Marianne’s says it was the study’s reference oil; the Seed Oil Free Alliance says the same and notes UC Davis did not endorse any product. The other brand named pure in 2020, Chosen Foods, is not listed here: none of its four avocado-oil dressings and mayonnaises matched authentic avocado oil in that 2026 study.
- It is refined “at low temperatures”. Marianne’s does not say whether solvents such as hexane are used.
- The Seed Oil Free Alliance licenses its seal to brands for a fee, and its stated purpose is verifying that a product contains no seed oils, not freshness. Marianne’s says the Clean Label Project listing means independent testing for heavy metals, pesticides and other contaminants; we did not read the results.
- Where the avocados come from changes with the harvest, so a given bottle may not say which country. Our avocado oil guide says the case for avocado oil is mostly its fat profile, with little human outcome data.
What to know Details worth knowing first
Avocado oil is the cooking oil most often found to be stale or cut with cheaper oils. UC Davis found only two brands pure and not oxidized in its 2020 test, and Marianne’s was one. What makes it stand out now is that the evidence is not only a single old study. Two certifiers list the oil, and Marianne’s publishes what it finds in each load.
The oil is refined, so it tastes neutral and the maker puts its smoke point at 500°F. Our guide to avocado oil says to use refined avocado oil for high-heat cooking. The bottle is dark glass, which is what we look for.
The gaps are small but real. Marianne’s does not say whether solvents are used in refining, and the lab behind its sterol and tocopherol results is not named. For how it compares with other oils at high heat, see which oils hold up.
Quality & testing How it measures up against our checklist
- Third-party tested
- Yes
- Tested by
- UC Davis (2020 study), Seed Oil Free Alliance and Clean Label Project
| What we checked | What we found |
|---|---|
| Purity you can check Verified | UC Davis’s 2020 study named Marianne’s as one of two brands with pure, nonoxidized samples. The Seed Oil Free Alliance and Clean Label Project both list the 500 mL oil today. Marianne’s says it tests every load of crude oil before it enters its facility. |
| Fat profile stated, with omega-6 Maker’s claim | Published medians for loads received November 2025 to August 2026: 19.0% palmitic, 8.3% palmitoleic, 59.9% oleic, 11.4% linoleic, 1.0% alpha-linolenic. Marianne’s own data. |
| Made without solvents Not verified | Described as “gently refined at low temperatures”. No extraction method or solvent statement found. |
| Packaging that blocks light, with a date Maker’s claim | Dark glass in the 500 mL size, per the maker’s FAQ and photo. We did not see a date on a bottle. |
| A traceable source Maker’s claim | Countries named by season: Mexico, Colombia, Peru, Kenya, Ethiopia and South Africa. No farm or mill named. |
What the labels mean
- Verified We opened an independent record that confirms it: a certifier’s listing, a regulator’s list or a lab report. It is linked under Sources.
- Maker’s claim The maker says so on its own page or label. We read it but found no independent record.
- Not verified We looked and could not confirm it, or the maker does not say. Treat it as unknown.
Sources Where our facts come from
- Marianne’s Harvest Classic Avocado Oil product page. Maker’s page. Open ↗
- Marianne’s Harvest: Our results vs. Codex. Maker’s page. Median fatty acid, sterol and tocopherol results, with Codex ranges. Open ↗
- UC Davis: Study finds 82 percent of avocado oil rancid or mixed with other oils (June 2020). Test report. Names Marianne’s and Chosen Foods as the two brands with pure, nonoxidized samples. Open ↗
- UC Davis media kit for the 2026 study of avocado-oil foods: table of studied products. Test report. Lists the 74 samples tested (37 foods, two samples each) and marks those consistent with authentic oil. Marianne’s is not among them. The four Chosen Foods avocado-oil dressings and mayonnaises are, and none is marked. Open ↗
- Seed Oil Free Alliance: Marianne’s Harvest certified products. Certifier or regulator listing. Certified since August 2025; lists the Classic Avocado Oil 500 ml. The Alliance licenses its seal for a fee. Open ↗
- Clean Label Project: search results for Marianne’s. Certifier or regulator listing. Lists Marianne’s Avocado Oil 500mL, dated July 30, 2026. Marianne’s calls it a Purity Award. Open ↗
Where to buy Other stores and the prices we saw
- Walmart.com approx. $17 for 16.9 fl oz (listed at $16.98, down from $19.98). Sold by Marianne and fulfilled by Walmart. Marianne’s also lists Sprouts, Target and Amazon.
Prices as we saw them on October 22, 2026. They change often. These links carry no tracking code and earn us nothing.
Alternatives Other options to compare
- Marianne’s Harvest Organic Beef Tallow From the same maker, for frying and roasting. USDA organic.
- Cobram Estate California Select Extra Virgin Olive Oil For raw and low-heat cooking. Our olive oil page covers the evidence.