Food · Seasonings
Bonito Extract (Katsuobushi)
鰹節エキス (Katsuobushi ekisu)
Also known as: Skipjack Tuna Extract, Bonito Dashi Extract
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| Category | Food |
|---|---|
| INCI name | Not applicable (food use)↗ |
| Japanese labeling name | Not applicable (food use) |
| Common Japanese notations | 鰹節エキス, カツオブシエキス |
| Origin | Animal-derived (dried, fermented, smoked skipjack tuna) |
| Typical functions | Umami flavoring (primary), Functional peptide source (anserine, carnosine) |
| Regulatory status in Japan | Food regulated under the Food Sanitation Act. Functional-food applications (imidazole dipeptides) may be notified under the Foods with Function Claims system. |
Katsuobushi — the dried, smoked, and fermented form of skipjack tuna — is the essential ingredient of Japanese dashi stock. A secondary product stream concentrates the extract for seasoning applications, and isolated components (including anserine and carnosine, collectively known as imidazole dipeptides) have entered the supplement and functional food categories.
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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
Functions
Regulatory tags
Common OEM product categories
Finished-product categories where Japanese OEM manufacturers commonly formulate with this ingredient.
- Dashi base stock
- Seasoning pastes and sauces
- Imidazole-dipeptide-positioned supplements
Ingredient profile
Katsuobushi is produced by boiling, smoking, and sun-drying skipjack tuna, sometimes followed by inoculation with Aspergillus glaucus for extended fermentation. The finished product is shaved into flakes for dashi preparation.
Extract-grade katsuobushi is concentrated through water or enzymatic processing. The extract contains free amino acids (notably inosine-monophosphate-bound and free forms), imidazole dipeptides, and umami-active nucleotides.
OEM applications
In food, katsuobushi is the primary umami source in Japanese cooking — the base of dashi, a topping for okonomiyaki and takoyaki, and a component of many sauces.
In supplements, anserine and carnosine isolated from katsuobushi are sold under various positioning, including Foods with Function Claims where specific notifications have been accepted.
Regulatory classification in Japan
Food regulation under Food Sanitation Act.
Functional-food applications under the Consumer Affairs Agency Foods with Function Claims system where specific notifications are on file.
Regulatory classification in other markets
| EU | Katsuobushi and derivatives are traditional foods outside the EU, and imports may require specific food safety documentation. Fish-derived functional peptides may fall under Novel Food regulation. |
|---|---|
| USA | Food use and supplement use are established. |
| China | Umami-use preparations permitted under food classifications. |
| Korea | Similar Japanese-cuisine-style applications exist. |
Market reference formulations
Example finished products will be added after each product's current full ingredient list has been verified.
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.
Certifications commonly available
Certification schemes commonly obtainable for this raw material. Always confirm the specific supplier's current certificate before contracting.
| Scheme | Availability | |
|---|---|---|
| Halal | Unavailable | Mold-fermentation step (Aspergillus glaucus) and traditional process do not align with Halal slaughter chains; some 'Halal-friendly' products use shorter / mold-free curing |
| Kosher | Inherent / On-request | Bonito has scales/fins (Kosher); processing chain cert needed |
| Pareve | On-request |
Documented adulteration risks
Known fraud / adulteration patterns reported by regulators or industry bodies. Specify CoA params and screening tests on every PO.
- Substitution with cheaper ソウダガツオ (Auxis), マルソウダ (frigate tuna), or sodagatsuo species in lower-grade kezuribushi
- 削り節 from non-true-katsuobushi (荒節 only, without mold-curing) sold as 本枯節
Detection: DNA species verification; visual mold-curing stage marker (4 moldings = 本枯節 grade)
全国削節工業協会 表示ガイドライン
Alternative ingredients
Related ingredients commonly evaluated as substitutes.
Quick answers
- What is Bonito Extract (Katsuobushi)?
- Katsuobushi — the dried, smoked, and fermented form of skipjack tuna — is the essential ingredient of Japanese dashi stock. A secondary product stream concentrates the extract for seasoning applications, and isolated components (including anserine and carnosine, collectively known as imidazole dipeptides) have entered the supplement and functional food categories.
- What is the regulatory status of Bonito Extract (Katsuobushi) in Japan?
- Food regulated under the Food Sanitation Act. Functional-food applications (imidazole dipeptides) may be notified under the Foods with Function Claims system.
- What products typically use Bonito Extract (Katsuobushi)?
- Dashi base stock / Seasoning pastes and sauces / Imidazole-dipeptide-positioned supplements
- Where does Bonito Extract (Katsuobushi) come from?
- Animal-derived (dried, fermented, smoked skipjack tuna)
- What is the INCI / JSCI labeling name for Bonito Extract (Katsuobushi)?
- INCI: Not applicable (food use) / JSCI: Not applicable (food use)
Explore related ingredients
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Other ingredients commonly used in the same finished-product families.
Sharing similar functions
Ingredients that overlap on functional benefit tags.
From the same origin
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Regulatory guidance
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FAQ for OEM buyers
Q. What is katsuobushi and how is it different from the extract form?
Katsuobushi is skipjack tuna (Katsuwonus pelamis) that has been simmered, smoked over wood, sun-dried, and in the highest 'karebushi' grades inoculated with Aspergillus glaucus for repeated mold-fermentation cycles. The shaved flakes are the traditional dashi base. Katsuobushi extract is a downstream product made by hot-water or enzymatic extraction of the dried fish, then concentrated to a liquid or spray-dried to a powder, with umami components (free glutamate and inosinate / IMP) and amino acids standardized for use in seasoning bases.
Sources · Last reviewed: 2026-04-26
Q. Why does dashi made with katsuobushi taste so strongly of umami?
Dried katsuobushi is one of the richest known dietary sources of inosine 5'-monophosphate (IMP), the nucleotide identified by Kuninaka in 1957 as producing strong synergy with glutamate. When katsuobushi (IMP-rich) is combined with kombu (glutamate-rich) in the standard Japanese ichiban-dashi, the perceived umami intensity is several times the sum of the individual ingredients — the classic glutamate-nucleotide synergy effect.
Q. Are anserine and carnosine from katsuobushi recognized as functional ingredients in Japan?
Yes. Imidazole dipeptides (anserine and carnosine), naturally concentrated in skipjack tuna muscle and therefore in katsuobushi, have been notified as functional ingredients under Japan's Foods with Function Claims (機能性表示食品 / FFC) system administered by the Consumer Affairs Agency. Notified claims relate principally to support for cognitive function and reduction of physical fatigue in healthy adults; the specific permitted wording is set per notification.
Sources · Last reviewed: 2026-04-26
Q. Is katsuobushi safe to import into the EU?
Katsuobushi is a fishery product and is subject to EU import controls for products of animal origin: import only from EU-listed third-country establishments, accompanied by a health certificate, and entry through a Border Control Post. There has been a long-standing point of friction around polycyclic aromatic hydrocarbons (PAHs) generated by the smoking step — Regulation (EU) 2023/915 sets maximum levels for benzo(a)pyrene and the sum of four PAHs in smoked fishery products that some traditionally smoked katsuobushi can exceed without process adjustment.
Sources · Last reviewed: 2026-04-26
Use cases
Ramen and noodle soup base concentrates
- Positioning
- Authentic Japanese dashi-style umami platform combined with shoyu / miso / tonkotsu carriers for export ramen and soba lines.
- Typical usage level
- Liquid extract: 1–5% in finished broth; spray-dried powder: 0.3–1.5% in dry seasoning sachets.
- Formulation notes
- Pair with kombu glutamate (or MSG) to exploit IMP–glutamate synergy; salt and sugar carry the umami forward in chilled-storage broth bases.
Japanese-style sauces and tare (teriyaki, tsuyu, ponzu)
- Positioning
- Premium 'authentic Japanese' positioning where katsuobushi is highlighted on the front label.
- Typical usage level
- 0.5–3% as liquid extract in sauce formulations.
- Formulation notes
- Heat-stable to typical sauce pasteurization (85–95 °C); flavor degrades with prolonged retort, so prefer post-thermal addition for retort lines.
Imidazole dipeptide supplements (anserine / carnosine)
- Positioning
- FFC-notified positioning around cognitive function and physical fatigue support, sold as soft gels, tablets, or single-serve drinks.
- Formulation notes
- Purified imidazole-dipeptide preparations are typically dosed at 200–500 mg of combined anserine + carnosine per daily serving in registered FFC products; verify the exact level claimed in the relevant Consumer Affairs Agency notification.
Savory snack seasoning powders
- Positioning
- Japanese-style 'umami-rich' coating for rice crackers (senbei), potato chips, and roasted nuts.
- Typical usage level
- 5–15% of the seasoning blend (which itself is dosed at 3–8% on the snack base).
- Formulation notes
- Spray-dried form with maltodextrin or starch carrier flows well through standard seasoning tumblers.
Sources
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
- 農林水産省 (Ministry of Agriculture, Forestry and Fisheries) food classification — katsuobushi
Last updated: 2026-04-22. Ingredient entries are reviewed at least annually against current regulatory listings.