Food · Oils & fats
Walnut Oil
クルミ油 (Kurumi-yu)
Also known as: Juglans Regia Seed Oil
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| Category | Food |
|---|---|
| INCI name | Juglans Regia Seed Oil↗ |
| Japanese labeling name | クルミ油 |
| Common Japanese notations | クルミ油 |
| Origin | Plant-derived (Juglans regia walnut seeds) |
| Typical functions | Culinary fat, Cosmetic emollient |
| Regulatory status in Japan | Food regulated under Food Sanitation Act. Cosmetic use permitted under JSCI dictionary. |
Walnut oil is a delicate finishing oil with a pronounced nutty character. In Japanese specialty markets it is sold both as a finishing culinary oil and used in some cosmetic formulations. The oil is rich in polyunsaturated fatty acids including linoleic and alpha-linolenic acids.
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Classification
Tags below link to other ingredients sharing the same attribute, so you can pivot from one ingredient to its peers.
Product applications
Regulatory tags
Origin
Common OEM product categories
Finished-product categories where Japanese OEM manufacturers commonly formulate with this ingredient.
- Specialty culinary finishing oil
- Face oils and lip products
- Massage oils
Ingredient profile
Walnut oil is cold-pressed from Juglans regia walnut seeds. The fatty acid profile is dominated by polyunsaturates: linoleic acid (50–60 percent) and alpha-linolenic acid (10–15 percent), with smaller proportions of oleic and saturated fatty acids.
OEM applications
In food, walnut oil is used as a finishing oil for salads and pasta. Its low smoke point makes it unsuitable for high-heat cooking.
In cosmetics, walnut oil is used in face oils, lip products, and some specialty formulations.
Regulatory classification in Japan
Food and cosmetic use permitted under the relevant frameworks.
Regulatory classification in other markets
| EU | Food and cosmetic uses permitted. Walnuts are a listed allergen for food labeling purposes. |
|---|---|
| USA | Food and cosmetic uses permitted. Walnuts are a listed major food allergen. |
| China | Permitted. |
| Korea | Permitted. |
Market reference formulations
Example finished products will be added after verification.
All brand names and product names referenced anywhere on this site are the property of their respective owners. Example entries are provided for informational purposes only and do not imply endorsement.
Alternative ingredients
Related ingredients commonly evaluated as substitutes.
Quick answers
- What is Walnut Oil?
- Walnut oil is a delicate finishing oil with a pronounced nutty character. In Japanese specialty markets it is sold both as a finishing culinary oil and used in some cosmetic formulations. The oil is rich in polyunsaturated fatty acids including linoleic and alpha-linolenic acids.
- What is the regulatory status of Walnut Oil in Japan?
- Food regulated under Food Sanitation Act. Cosmetic use permitted under JSCI dictionary.
- What products typically use Walnut Oil?
- Specialty culinary finishing oil / Face oils and lip products / Massage oils
- Where does Walnut Oil come from?
- Plant-derived (Juglans regia walnut seeds)
- What is the INCI / JSCI labeling name for Walnut Oil?
- INCI: Juglans Regia Seed Oil / JSCI: クルミ油
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Regulatory guidance
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FAQ for OEM buyers
Q. What is the typical fatty acid profile of walnut oil?
Walnut oil is rich in polyunsaturated fatty acids, with approximately 50-65% linoleic acid and 9-15% alpha-linolenic acid (ALA). This high PUFA content drives its omega-6:omega-3 nutritional positioning but also makes it highly susceptible to oxidation.
Sources · Last reviewed: 2026-04-26
Q. Why is walnut oil unsuitable for high-heat cooking?
Walnut oil has a smoke point of approximately 160°C, well below typical frying temperatures, and its high PUFA content rapidly oxidizes and develops off-flavors when heated. It is positioned as a finishing oil for salads and pasta rather than a cooking oil.
Sources · Last reviewed: 2026-04-26
- Industry knowledge — culinary oil smoke point references
Q. What allergen labeling rules apply to walnut oil in Japan?
Walnut (kurumi) became a mandatory-display allergen under Japan's Food Labeling Standards effective 2025 (with transition through March 2025), requiring clear allergen labeling on packaged food products containing walnut. Refined walnut oil generally still triggers labeling requirements in Japan unless specifically exempted.
Sources · Last reviewed: 2026-04-26
Q. Is Juglans Regia Seed Oil approved for cosmetic use in major markets?
Yes — Juglans Regia Seed Oil is INCI-registered and listed in JSCI, and can be used as an emollient in standard cosmetics in Japan, EU, and US markets. Tree-nut allergen warnings on product packaging are recommended for sensitive consumers.
Sources · Last reviewed: 2026-04-26
- Personal Care Products Council — INCI Dictionary (Juglans Regia Seed Oil)
- JCIA — JSCI ingredient dictionary
Use cases
Premium finishing oil (salad and pasta drizzle)
- Positioning
- Specialty/gourmet retail; nuanced nutty flavor
- Formulation notes
- Glass bottle 100-250 mL; often nitrogen-flushed for shelf stability.
Sources
- Industry knowledge — gourmet oil retail
Industry-knowledge claim — not yet pinned to a single primary source
Lip balm and lip oil cosmetic
- Positioning
- Conditioning emollient with botanical ingredient story
- Typical usage level
- 5-30% of formula
- Formulation notes
- Combined with castor oil, beeswax, or candelilla wax; tocopherol for oxidation control.
Sources
- Industry knowledge — Japanese lip cosmetic formulation
Industry-knowledge claim — not yet pinned to a single primary source
Face oil / facial serum
- Positioning
- PUFA-rich nourishing oil for dry-skin lines
- Typical usage level
- 5-50%
- Formulation notes
- Blended with squalane or jojoba for texture; antioxidants required.
Sources
- Industry knowledge — Japanese face oil formulation
Industry-knowledge claim — not yet pinned to a single primary source
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Official regulatory databases
External links to public Japanese / international regulatory authorities. We are not affiliated.
References
- JSCI (Japanese Cosmetic Industry Association) labeling name directory — クルミ油
- EU CosIng entry: Juglans Regia Seed Oil
Last updated: 2026-04-22. Ingredient entries are reviewed at least annually against current regulatory listings.