Walnut oil
Walnut oil suppliers and sourcing guide
Walnut oil is pressed from the kernels of the English or Persian walnut, Juglans regia, much of it from California, France and China. It is high in linoleic acid and contains alpha-linolenic acid, so it is less stable than most nut oils. It is sold as roasted (toasted) culinary oil, cold-pressed oil for foods and supplements, and refined oil for cosmetics.
- Category
- Oils and fats
- Also known as
- Juglans regia seed oil · English walnut oil · Juglans Regia (Walnut) Seed Oil
- Facts checked
- November 2026
Forms and grades of walnut oil
Suppliers sell different products under the same name. Specify the one you need.
Roasted oil
Oil pressed from toasted kernels for a stronger nutty flavor, used in dressings and finishing.
Cold-pressed oil
Oil pressed from raw kernels, lighter in flavor, used in foods, supplements and natural cosmetics.
Refined oil
Refined and deodorized oil with neutral flavor and less protein, used in cosmetics and some foods.
Organic
Oil from certified organic walnuts.
What to check on the COA
Compare each result with your own specification when the lot arrives.
- Fatty acid profile
- Fatty acid composition by GC of the methyl esters (AOCS Ce 1-62 or an equivalent ISO method), reported as percent of total fatty acids; linoleic and alpha-linolenic acids are the key figures.
- Peroxide and anisidine values
- Peroxide value (AOCS Cd 8b-90) for primary oxidation and p-anisidine value for secondary oxidation, often combined as TOTOX; these show how fresh the oil is at release.
- Free fatty acids
- Free fatty acids or acid value by titration (AOCS Ca 5a-40 or Cd 3d-63), which rises with poor seed handling, hydrolysis and age.
- Aflatoxins
- Aflatoxins B1, B2, G1 and G2 by HPLC or LC-MS/MS, relevant to nut oils, especially unrefined grades.
- Allergen and identity
- Supplier statement on refining level and allergen status, plus identity tests such as iodine value; unrefined oil carries walnut protein.
Storage, lots and expiry
Storage and shelf life
Store sealed, cool and dark, and refrigerate after opening; walnut oil turns rancid faster than most nut oils. Buy in sizes that match usage to limit air exposure. Shelf life is set by the supplier specification.
Lots and expiry dates
Flavor, color and oxidation values vary with roast level and kernel quality, so record them and the aflatoxin result for each lot. Rotate first-expiry, first-out, and keep allergen controls in place for any facility that also handles non-nut products.
Regulatory status
Facts from regulators and standards bodies, each linked to its source.
FDA lists tree nuts as a major food allergen and says the type of tree nut, such as walnuts, must be declared on the label.
Source: fda.gov (opens in a new tab)FDA's food allergies page says its enforcement of allergen labeling does not include highly refined oils.
Source: fda.gov (opens in a new tab)21 CFR 101.12 names walnut oil as an example in the 'seasoning oils and seasoning sauces' category, with a reference amount of 1 tbsp.
Source: ecfr.gov (opens in a new tab)Health Canada's Natural Health Products Ingredients Database lists Juglans Regia (Walnut) Seed Oil as a non-medicinal occlusive skin-conditioning agent for topical use only.
Source: webprod.hc-sc.gc.ca (opens in a new tab)
This is general information, not regulatory advice. Status differs by country and by how the ingredient is used, so check the rules for your product and market.
Walnut oil suppliers
Manufacturers and distributors whose own websites say they sell it.
We are checking walnut oil suppliers now
Every listing is checked against the supplier’s own website before it goes live, so this list fills in over the coming weeks. The specs and COA checklist above are ready today.
Sell walnut oil? Request a listingFrequently asked questions
What forms of walnut oil can brands buy?
Common forms include roasted oil, cold-pressed oil, refined oil and organic. Ask each supplier for the specification sheet of the exact grade they quote.
What should the COA for walnut oil include?
Expect fatty acid profile, peroxide and anisidine values, free fatty acids, aflatoxins and allergen and identity, each with its method, specification and result for that lot.
How should walnut oil be stored?
Store sealed, cool and dark, and refrigerate after opening; walnut oil turns rancid faster than most nut oils. Buy in sizes that match usage to limit air exposure. Shelf life is set by the supplier specification.
What is the regulatory status of walnut oil?
FDA lists tree nuts as a major food allergen and says the type of tree nut, such as walnuts, must be declared on the label. FDA's food allergies page says its enforcement of allergen labeling does not include highly refined oils. 21 CFR 101.12 names walnut oil as an example in the 'seasoning oils and seasoning sauces' category, with a reference amount of 1 tbsp. Health Canada's Natural Health Products Ingredients Database lists Juglans Regia (Walnut) Seed Oil as a non-medicinal occlusive skin-conditioning agent for topical use only.
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