Traditional · Fermented foods
Aspergillus Oryzae Ferment
麹 (Kōji)
Also known as: Koji, Rice Koji
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| Category | Traditional |
|---|---|
| INCI name | Aspergillus / Rice Ferment Extract (for rice-substrate koji preparations) |
| Japanese labeling name | コウジエキス (for cosmetic extract forms) |
| Common Japanese notations | 麹, コウジ, 米麹 |
| Origin | Fermented (Aspergillus oryzae cultured on rice or other substrate) |
| Typical functions | Fermentation starter (food applications), Skin conditioning (cosmetic applications) |
| Regulatory status in Japan | Aspergillus oryzae is Japan's designated national microorganism. Food applications are regulated under the Food Sanitation Act; cosmetic ferment extracts are listed in the JSCI (Japanese Cosmetic Industry Association) labeling name dictionary. |
Koji — Aspergillus oryzae cultured on steamed rice — is the organism that makes Japanese fermentation possible. It is the starter for sake, soy sauce, miso, mirin, and rice vinegar, and it is culturally central enough that it was designated Japan's national fungus (kokkin) in 2006. In cosmetics, koji and its extracts connect directly to the fermentation heritage that underpins many Japanese beauty ingredients.
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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.
Common OEM product categories
Finished-product categories where Japanese OEM manufacturers commonly formulate with this ingredient.
- Sake, soy sauce, miso, mirin production
- Shio-koji, ama-zake
- Cosmetic extracts positioning around fermentation heritage
Ingredient profile
Koji is produced by inoculating steamed rice (or soybeans, barley, or other substrates) with Aspergillus oryzae spores and incubating under controlled temperature and humidity for several days. The resulting fermented material is called koji (specifically rice-koji when the substrate is rice).
Cosmetic applications typically use water or hydro-alcoholic extracts of koji preparations. These extracts concentrate the enzymes, amino acids, polysaccharides, and secondary metabolites produced by Aspergillus oryzae during fermentation.
The Koji family — four-tier hierarchy. Japanese fermentation entries form a clear lineage: (1) Tane-Koji (種麹, the spore-form starter culture sold by specialist tane-koji-ya producers — typically referenced in Sourcing rather than the Glossary); (2) Aspergillus Oryzae Ferment / Koji (this entry, the cultivated mold itself, used as the substrate base for downstream fermentations); (3) Shio Koji and Amazake (koji-derived liquid preparations — salt-koji marinade and the sweet non-alcoholic koji beverage, respectively); (4) major commercial fermented products that all start from Aspergillus oryzae cultivation — miso, soy sauce, sake, mirin, rice vinegar.
OEM applications
In food production, koji is the essential intermediate for producing nearly every major Japanese fermented seasoning. The food-grade material is handled under separate food-safety regulation from cosmetic applications.
In cosmetics, koji-derived extracts appear in essences, toners, and fermented-beauty product lines. They are often paired with sake-related ingredients (sake lees extract, rice ferment filtrate) to reinforce a unified fermentation story.
Regulatory classification in Japan
Aspergillus oryzae is Generally Recognized as Safe in food applications under Japanese regulation, with a long history of use.
Cosmetic extracts derived from Aspergillus oryzae fermentation are listed in the JSCI (Japanese Cosmetic Industry Association) labeling name dictionary under category-specific names (e.g., コウジエキス, コメ発酵エキス).
Regulatory classification in other markets
| EU | Aspergillus oryzae-derived ingredients are listed in CosIng under various fermentation-ingredient INCI names. Permitted for cosmetic use. |
|---|---|
| USA | GRAS status for Aspergillus oryzae in food applications. Cosmetic uses are widely accepted. |
| China | Suppliers should verify their specific cosmetic preparation against IECIC listings. |
| Korea | Permitted as a food and cosmetic ingredient under the relevant regulatory frameworks. |
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.
Alternative ingredients
Related ingredients commonly evaluated as substitutes.
Quick answers
- What is Aspergillus Oryzae Ferment?
- Koji — Aspergillus oryzae cultured on steamed rice — is the organism that makes Japanese fermentation possible. It is the starter for sake, soy sauce, miso, mirin, and rice vinegar, and it is culturally central enough that it was designated Japan's national fungus (kokkin) in 2006. In cosmetics, koji and its extracts connect directly to the fermentation heritage that underpins many Japanese beauty ingredients.
- What is the regulatory status of Aspergillus Oryzae Ferment in Japan?
- Aspergillus oryzae is Japan's designated national microorganism. Food applications are regulated under the Food Sanitation Act; cosmetic ferment extracts are listed in the JSCI (Japanese Cosmetic Industry Association) labeling name dictionary.
- What products typically use Aspergillus Oryzae Ferment?
- Sake, soy sauce, miso, mirin production / Shio-koji, ama-zake / Cosmetic extracts positioning around fermentation heritage
- Where does Aspergillus Oryzae Ferment come from?
- Fermented (Aspergillus oryzae cultured on rice or other substrate)
- What is the INCI / JSCI labeling name for Aspergillus Oryzae Ferment?
- INCI: Aspergillus / Rice Ferment Extract (for rice-substrate koji preparations) / JSCI: コウジエキス (for cosmetic extract forms)
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Regulatory guidance
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FAQ for OEM buyers
Q. Why is Aspergillus oryzae considered Japan's national microorganism?
Aspergillus oryzae (kojikin) was officially designated Japan's national microorganism (kokkin) by the Brewing Society of Japan in 2006 in recognition of its central role in producing sake, miso, soy sauce, mirin, and other foundational fermented foods. This cultural/historical positioning is often referenced in OEM product narratives.
Sources · Last reviewed: 2026-04-26
- Brewing Society of Japan — Designation of kokkin (Aspergillus oryzae) (Industry knowledge)
Q. Is Aspergillus oryzae considered safe for food applications globally?
Yes — Aspergillus oryzae has GRAS status in the United States (FDA) for enzyme production and is widely accepted in EU/Japan/Asia for traditional fermented food production. The strain does not produce aflatoxins under normal conditions, distinguishing it from related species like A. flavus.
Sources · Last reviewed: 2026-04-26
Q. What is the difference between rice koji, barley koji, and soybean koji?
All are A. oryzae cultures, but differ by substrate: rice koji is the basis for sake, mirin, amazake, and most miso; barley (mugi) koji produces barley miso and certain shochu; soybean (mame) koji is used for hatcho miso and some soy sauce styles. Each substrate yields different enzyme balances and flavor profiles.
Sources · Last reviewed: 2026-04-26
- Industry knowledge — Japanese koji and fermentation industry
Industry-knowledge claim — not yet pinned to a single primary source
Q. What format options exist for OEM koji and koji-related ingredients?
Common formats include dry rice koji (kome-koji) in 200 g-25 kg packs, fresh refrigerated koji for short-shelf-life applications, shio-koji and amazake liquid bases for foodservice, and concentrated koji extract for cosmetic and supplement use. Industrial users often source from specialist seed-koji suppliers like Bio'c or Akita Konno.
Sources · Last reviewed: 2026-04-26
- Industry knowledge — Japanese koji manufacturing supply chain
Industry-knowledge claim — not yet pinned to a single primary source
Use cases
Shio-koji seasoning (refrigerated jar/pouch)
- Positioning
- Trendy fermentation seasoning for marination and dressing
- Formulation notes
- Cooked rice + koji + salt + water aged 1-2 weeks; refrigerated retail SKU.
Sources
- Industry knowledge — Japanese fermented seasoning market
Industry-knowledge claim — not yet pinned to a single primary source
Amazake (non-alcoholic rice koji beverage)
- Positioning
- Traditional drink positioned as 'drinkable IV' (nomu tenteki)
- Formulation notes
- Rice koji + steamed rice + water; PET bottle 150-1000 mL or pouch.
Sources
- Industry knowledge — Japanese amazake market
Industry-knowledge claim — not yet pinned to a single primary source
Rice ferment filtrate cosmetic essence
- Positioning
- Fermented-beauty premium skincare line
- Typical usage level
- 1-30% in essence formulations
- Formulation notes
- INCI: Aspergillus / Rice Ferment Extract; pairs with sake yeast extract narrative.
Sources
- Industry knowledge — Japanese fermented-beauty cosmetic formulation
Industry-knowledge claim — not yet pinned to a single primary source
Industrial koji as sake/shochu/miso/soy-sauce intermediate
- Positioning
- B2B supply to brewery and seasoning manufacturers
- Formulation notes
- Rice/barley/soybean koji; specifications by enzyme activity (alpha-amylase, protease).
Sources
- Industry knowledge — Japanese seed-koji supplier market
Industry-knowledge claim — not yet pinned to a single primary source
Search the academic literature
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Official regulatory databases
External links to public Japanese / international regulatory authorities. We are not affiliated.
References
- Brewing Society of Japan — koji and sake fermentation overview
- JSCI (Japanese Cosmetic Industry Association) labeling name directory — fermentation-derived extract entries
Last updated: 2026-04-22. Ingredient entries are reviewed at least annually against current regulatory listings.