Why source from Japan
Japanese commercial harvesting (Akita / Yamagata) and the fucoxanthin-positioning supplement category were both pioneered domestically.
Key spec
Fucoxanthin 0.05-0.3% dry weight; soluble dietary fibre 30-40%; alginate 15-25%.
Typical end-product
Premium retail packs (frozen / fresh), miso soup additions, fucoxanthin metabolic-support supplements.
At a glance
- Suppliers listed
- 2 suppliers
- Typical MOQ
- 20–100 kg fresh-frozen; 5–25 kg powder; 1–5 kg fucoxanthin extract
- Typical lead time
- 4–8 weeks (food); 10–14 weeks (extract)
- Regions of origin
- Akita, Yamagata, Niigata, Fukui
- Category
- Marine functional ingredients
- Harvest season
- Late winter – early spring (peak February – April)
- Japan regulatory status
- Food product; iodine content disclosure; FFC notifications exist for fucoxanthin
- Japanese name
- アカモク
- Romaji
- Akamoku
About this ingredient
A brown seaweed (Sargassum horneri) historically considered nuisance bycatch but now positioned as a premium functional food on the back of fucoxanthin content. Akita, Yamagata and Niigata are the primary commercial production regions. The texture changes dramatically when chopped — releasing soluble dietary fibre that gives akamoku its signature thick, slippery mouthfeel. Used in soups, salads, and increasingly in fucoxanthin-extract supplements for metabolic-health positioning.
Regulatory status
| Japan | Food product; iodine content disclosure; FFC notifications exist for fucoxanthin |
|---|---|
| EU | Food import; iodine cap monitoring; Novel Food check for fucoxanthin extracts |
| United States | GRAS for traditional food use; DSHEA NDI for fucoxanthin supplements |
| China | Imported seaweed; GACC + AQSIQ inspection |
Looking for alternatives?
Common reasons buyers swap to a different ingredient — and what we'd suggest based on this ingredient's profile.
Vegan / plant-based alternatives
Akamoku (Gulfweed Seaweed) is animal-derived. If you need a non-animal source with similar functions, consider:
Fucoidan
フコイダン
INCI Fucoidan (from various brown seaweeds); MOQ from 1–10 kg.
Plant-based· shares 3 categories
Astaxanthin
アスタキサンチン
INCI Astaxanthin; FFC notification(s) on file; MOQ from 1–10 kg (oil-based concentrate).
Plant-based· shares 3 categories
GABA (Gamma-Aminobutyric Acid)
γ-アミノ酪酸
FFC notification(s) on file; MOQ from 10–50 kg.
Plant-based· shares 3 categories
Easier EU regulatory path
Akamoku (Gulfweed Seaweed) faces a more restrictive regulatory pathway in EU. These alternatives have a simpler status in that market:
Hokkaido Scallop
北海道ホタテ
Adductor protein 18-22%; taurine 600-800 mg/100g; shell-derived calcium >38% in calcined powder.
Simpler in EU· shares 4 categories
Fucoidan
フコイダン
INCI Fucoidan (from various brown seaweeds); MOQ from 1–10 kg.
Simpler in EU· shares 3 categories
Rishiri Kombu (Premium Hokkaido Kelp)
利尻昆布
Glutamate 1.5–3.5% dry weight; iodine 200–600 mg/100g; dashi clarity ranks among highest of all kombu varieties.
Simpler in EU· shares 3 categories
When does it make sense to swap an ingredient? Read the swap guide →
Japanese suppliers
Marine Bio Co., Ltd.
マリーンバイオ株式会社
OkinawaFucoxanthin extract from Sargassum
Yaizu Suisankagaku Industry Co., Ltd. (YSK)
焼津水産化学工業株式会社
Yaizu, ShizuokaEnglish supportExport experienceMarine biomass extraction
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Last updated: 2026-05-04