Japan Ingredient Sourcing
Raw material / 原材料Food ingredients

Wooden-Barrel-Aged Soy Sauce

木桶醤油 (Kioke jōzō shōyu)

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Why source from Japan

Kioke-fermented soy sauce is brewed in traditional Japanese cedar barrels (kioke, 木桶), some of which are over 100 years old and carry resident microbial communities.

Key spec

MOQ from 200–1000 L (tank batch) / 20–100 L (bottled).

Typical end-product

Premium bottled finishing soy sauce (export retail) — 'Craft soy sauce' positioning for premium retail in Europe, North America, and East Asia — small-format glass bottles with producer story and kioke production-method narrative on label.

At a glance

Suppliers listed
7 suppliers
Typical MOQ
200–1000 L (tank batch) / 20–100 L (bottled)
Typical lead time
8–16 weeks
Regions of origin
Shōdoshima (Kagawa), Chiba (Noda / Chōshi), Yuasa (Wakayama), Kyushu
Category
Food ingredients
Harvest season
Year-round (traditional fermentation 1–3 years)
Japan regulatory status
JAS standard applies (丸大豆 / 脱脂加工大豆 distinctions); natural fermentation specifications
Japanese name
木桶醤油
Romaji
Kioke jōzō shōyu

About this ingredient

Kioke-fermented soy sauce is brewed in traditional Japanese cedar barrels (kioke, 木桶), some of which are over 100 years old and carry resident microbial communities. Most modern commercial soy sauce uses stainless-steel tanks; kioke production has contracted to a small number of specialist breweries concentrated in Shōdoshima, Yuasa, and Chiba.

Regulatory status

JapanJAS standard applies (丸大豆 / 脱脂加工大豆 distinctions); natural fermentation specifications
EUFood import rules; check for additive restrictions
United StatesFDA food import rules
ChinaVerify import rules

FAQ for OEM buyers

Q. What MOQ and lead time should buyers expect for kioke-aged soy sauce?

Supplier-disclosed industry ranges are 200–1000 L for tank-batch supply and 20–100 L for bottled formats, with 8–16 week lead times. Because kioke production is small-scale and capacity is fixed by the number of operating barrels at each brewery, allocation to export buyers is typically through long-term relationships or trading-house intermediaries. Plan procurement at least 6 months ahead for any commercial volume.

Sources · Last reviewed: 2026-04-26

Industry-knowledge claim — not yet pinned to a single primary source

Q. What contaminant testing is required for EU export?

EU regulation sets a maximum 3-MCPD limit for soy sauce (currently 0.02 mg/kg in liquid; equivalent calculation on dry matter basis applies) under Commission Regulation (EC) No 1881/2006 and successor regulations. Reputable Japanese producers, including kioke shōyu specialists, can supply COA confirming compliance with the EU limit. Allergen labeling for soybeans and wheat is required for EU and US markets.

Sources · Last reviewed: 2026-04-26

Q. Can buyers source different shōyu varieties from kioke producers?

Most kioke producers focus on koikuchi (regular dark) shōyu, but some also produce tamari, saishikomi (twice-brewed), and other regional varieties using the kioke method. Saishikomi is notable as a more concentrated, slow-aged style sometimes called 'sashimi shōyu.' Specify the variety at RFQ — the kioke method is applied across multiple shōyu types and the production-method positioning translates across them.

Sources · Last reviewed: 2026-04-26

Industry-knowledge claim — not yet pinned to a single primary source

Use cases

  • Premium bottled finishing soy sauce (export retail)

    Positioning
    'Craft soy sauce' positioning for premium retail in Europe, North America, and East Asia — small-format glass bottles with producer story and kioke production-method narrative on label.
    Formulation notes
    Saishikomi (twice-brewed) is the most concentrated style and commands the highest unit price; koikuchi kioke shōyu is the most versatile premium format.

    Sources

  • Restaurant supply — sashimi dipping shōyu

    Positioning
    High-end Japanese restaurant supply where the multi-layered umami and aromatic profile justifies the premium versus mass-market shōyu; kioke production-method noted on menu and table cards.

    Sources

    Industry-knowledge claim — not yet pinned to a single primary source

  • Specialty tare and seasoning base for prepared foods

    Positioning
    Premium prepared-food and ramen-tare manufacturing — kioke shōyu used as a depth ingredient in tare blends or finishing components; positioning translates onto consumer packaging.

    Sources

    Industry-knowledge claim — not yet pinned to a single primary source

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Last updated: 2026-04-24

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