Food · Fermented foods

Okinawa Mozuku (Okinawan Brown Seaweed)

おきなわもずく (Okinawa-mozuku)

Also known as: Okinawa mozuku, Cladosiphon okamuranus, オキナワモズク, 沖縄もずく

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At a glance

Category	Food
Japanese labeling name	おきなわもずく
Common Japanese notations	おきなわもずく, 沖縄もずく, オキナワモズク
Origin	Cladosiphon okamuranus; cultivated in Okinawan coastal waters; principal modern production region Okinawa Prefecture (over 90% of domestic supply, with Onna-son, Itoman, and Ishigaki as major areas)
Typical functions	Mozuku-su (vinegared mozuku) — defining retail format, Fucoidan functional positioning (Cladosiphon mozuku is the principal commercial fucoidan source), Premium Okinawan gift retail, Foodservice and household soup ingredient
Regulatory status in Japan	Standard agricultural product labeling. Okinawa origin essential. Distinct from related cladosiphon-okamuranus-extract entry (which focuses on the cosmetic/functional extract). Multiple FFC registrations exist for fucoidan-positioned products. Not a designated allergen.

Okinawa mozuku (おきなわもずく) — Cladosiphon okamuranus — is the principal Japanese brown seaweed for vinegared mozuku-su (the defining retail format) and the leading commercial source of fucoidan for functional supplement positioning. Okinawa Prefecture dominates production at over 90% of domestic supply, with Onna-son, Itoman, and Ishigaki as major cultivation areas. See cladosiphon-okamuranus-extract for the related cosmetic/functional extract.

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Classification

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Product applications

Functions

Flavoring486

Regulatory tags

Culinary ingredient512

Origin

Marine-derived163

Common OEM product categories

Finished-product categories where Japanese OEM manufacturers commonly formulate with this ingredient.

Mozuku-su retail packs (volume retail format)
Fresh salted mozuku (for preparation)
Fucoidan supplements (Cladosiphon-derived)
Premium Onna mozuku Okinawa gift retail

Ingredient profile

Cladosiphon okamuranus, distinct from related mozuku species. Slimy textured, harvested in late spring through summer.

Production: Okinawa (over 90% domestic).

OEM applications

Mozuku-su retail packs — defining application.

Fucoidan FFC supplement and functional food.

Premium Okinawan gift retail.

For OEM: mozuku-su retail OEM, fucoidan supplement OEM, premium Okinawan gift retail.

Regulatory classification in Japan

Standard food labeling. Okinawa origin essential. FFC fucoidan registrations available. Not a designated allergen.

Regulatory classification in other markets

EU	Niche specialty in Asian cuisine and functional food channels.
USA	Established in functional food (fucoidan) and Asian cuisine channels.
China	Established functional food market.
Korea	Niche specialty positioning.

Market reference formulations

Example finished products will be added after verification of Okinawa origin (Onna / Itoman / Ishigaki).

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 Okinawa Mozuku (Okinawan Brown Seaweed)?: Okinawa mozuku (おきなわもずく) — Cladosiphon okamuranus — is the principal Japanese brown seaweed for vinegared mozuku-su (the defining retail format) and the leading commercial source of fucoidan for functional supplement positioning. Okinawa Prefecture dominates production at over 90% of domestic supply, with Onna-son, Itoman, and Ishigaki as major cultivation areas. See cladosiphon-okamuranus-extract for the related cosmetic/functional extract.
What is the regulatory status of Okinawa Mozuku (Okinawan Brown Seaweed) in Japan?: Standard agricultural product labeling. Okinawa origin essential. Distinct from related cladosiphon-okamuranus-extract entry (which focuses on the cosmetic/functional extract). Multiple FFC registrations exist for fucoidan-positioned products. Not a designated allergen.
What products typically use Okinawa Mozuku (Okinawan Brown Seaweed)?: Mozuku-su retail packs (volume retail format) / Fresh salted mozuku (for preparation) / Fucoidan supplements (Cladosiphon-derived) / Premium Onna mozuku Okinawa gift retail
Where does Okinawa Mozuku (Okinawan Brown Seaweed) come from?: Cladosiphon okamuranus; cultivated in Okinawan coastal waters; principal modern production region Okinawa Prefecture (over 90% of domestic supply, with Onna-son, Itoman, and Ishigaki as major areas)
What is the INCI / JSCI labeling name for Okinawa Mozuku (Okinawan Brown Seaweed)?: JSCI: おきなわもずく

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Sharing similar functions

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Official regulatory databases

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References

文部科学省 (Ministry of Education, Culture, Sports, Science and Technology) Standard Tables of Food Composition — おきなわもずく

Last updated: 2026-04-28. Ingredient entries are reviewed at least annually against current regulatory listings.