Muroto Deep Sea Water
室戸海洋深層水 (Muroto Kaiyō Shinsō-sui)
Why source from Japan
Cape Muroto's continental-shelf bathymetry yields the most stable deep-sea water profile in Japan; 30+ year-old commercial extraction infrastructure.
Key spec
Magnesium 1,200–1,400 mg/L; calcium 380–420 mg/L; Mg/Ca ratio ~3; nitrates and silica enriched vs surface water.
Typical end-product
Premium mineral-water RTD, deep-sea-water cosmetic toners and serums, magnesium-fortified salt.
At a glance
- Suppliers listed
- 1 supplier
- Typical MOQ
- 100–1,000 L bulk; 5–25 kg dried minerals
- Typical lead time
- 4–8 weeks
- Regions of origin
- Kōchi (Muroto, Aki), Toyama, Okinawa (Kume Island)
- Category
- Marine functional ingredients
- Harvest season
- Year-round (continuous extraction)
- Japan regulatory status
- Food / cosmetic ingredient; mineral disclosure under JAS / cosmetics labelling
- Japanese name
- 室戸海洋深層水
- Romaji
- Muroto Kaiyō Shinsō-sui
About this ingredient
Deep ocean water sourced 300–600 m below the surface off Cape Muroto in Kōchi. Stable temperature, mineral balance (Mg-rich), and low bacterial load make it a high-grade ingredient for cosmetic moisturisers, mineral beverage, and salt production. Kōchi Prefecture's Muroto and Aki facilities are the largest commercial deep-sea-water sources in Japan; Toyama Bay and Okinawa Kume Island also produce. Branded retail mineral waters and cosmetic moisturising lines have built a multi-decade premium category around the Muroto label specifically.
Regulatory status
| Japan | Food / cosmetic ingredient; mineral disclosure under JAS / cosmetics labelling |
|---|---|
| EU | Mineral water classification; CosIng listed (Sea Water / Maris Aqua) |
| United States | GRAS for food / beverage use; MoCRA cosmetic use |
| China | GB 2760 food-additive register; verify import |
Looking for alternatives?
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Vegan / plant-based alternatives
Muroto Deep Sea Water is animal-derived. If you need a non-animal source with similar functions, consider:
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FFC notification(s) on file; MOQ from 1-100 kg (pharmaceutical-grade powder).
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柚子エキス
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フコイダン
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Japanese suppliers
Ako Kasei Co., Ltd.
赤穂化成株式会社
Ako, HyogoEst. 1947English supportExport experienceFSSC 22000ISO 22000Operator of Muroto deep-sea-water extraction plant
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Last updated: 2026-05-05