Edible Seaweed
Edible seaweed consists of marine algae that are fit for human consumption and are sold fresh, chilled, frozen or dried. It is used directly as a food ingredient in cuisines worldwide.
Prices, specifications and international trade for edible seaweed under HS 121221.
Edible Seaweed Price
Published reference · Jul 1, 2026
Edible seaweed is quoted in USD/t at KOR. Historical customs values may differ from the headline reference.
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South Korea led reported edible seaweed exports in 2025, at $564M.
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Edible seaweed grading factors include Fit for human consumption and Form (fresh, chilled, frozen, dried).
Grading Factors
Quality assessment for edible seaweed considers Fit for human consumption and Form (fresh, chilled, frozen, dried).
- Fit for human consumption
Products must be suitable for direct consumption by humans, as defined in HS subheading 1212.21.00.00.
- Form (fresh, chilled, frozen, dried)
Edible seaweed may be presented in fresh, chilled, frozen, or dried states, all covered under heading 1212.
Common Defects
Recorded defects for edible seaweed include Discoloration, Sand or grit, and Mold or sliminess.
- Discoloration
Yellowing, browning, or dark spots on the fronds can result from oxidation, prolonged light exposure, or poor drying, affecting visual appeal and taste.
- Sand or grit
Residual sand or shell fragments in the product create an unpleasant mouthfeel and can damage teeth; often due to inadequate washing after harvest.
- Mold or sliminess
Visible mold growth or a slimy texture indicates microbial spoilage, often from excess moisture during storage or insufficient drying.
Edible Seaweed Facts and HS Code
Edible seaweed belongs to ingredients and additives within produce, nuts, spices and food ingredients. Its customs classification covers HS 121221.
Edible Seaweed HS Code
| Also known as | sea vegetables, marine algae |
|---|---|
| Product type | Raw |
| Form | Fresh |
| Position in the chain | Primary |
| Category | Ingredients and additives — Produce, nuts, spices and food ingredients |
| HS codes | 121221 |
| HS6 description | Seaweeds and other algae; fit for human consumption, fresh, chilled, frozen or dried, whether or not ground |
| Quoted in | USD/t |
| Reference location | KOR |
Production & Handling
Edible seaweed storage guidance: Store dried edible seaweed in a cool, dry, and dark place, protected from moisture and strong odors. For fresh or chilled forms, maintain consistent refrigeration to prevent spoilage and preserve texture.
Production and Storage
| Perishability | High |
|---|---|
| Temperature regime | Ambient |
| Storage conditions | Store dried edible seaweed in a cool, dry, and dark place, protected from moisture and strong odors. For fresh or chilled forms, maintain consistent refrigeration to prevent spoilage and preserve texture. |
| Production methods | Farmed, Wild capture |
| Processing steps |
|
Packaging
Typical edible seaweed packaging includes Vacuum-sealed plastic bags, Bulk bales or compressed blocks, and Food-grade plastic tubs with lids.
- Vacuum-sealed plastic bags
Used for dried seaweed to protect against moisture and odors, extending shelf life and preserving quality; common for retail and food service portions.
- Bulk bales or compressed blocks
For larger quantities, dried seaweed is compressed into blocks or bales wrapped in plastic, facilitating transport and storage while minimizing volume.
- Food-grade plastic tubs with lids
For fresh or chilled seaweed, sealed tubs maintain humidity and prevent drying out, often used for restaurant or direct-to-consumer supply.
Uses & Risks
Edible seaweed is used in Culinary applications, Food additives, and Nutritional supplements.
End Uses
- Culinary applications
Used directly in dishes such as sushi, soups, and salads
- Food additives
Incorporated as flavoring, thickening or gelling agents in processed foods
- Nutritional supplements
Processed into powders or extracts for health‑food products
Uses and Related Commodities
| Downstream industries | Food manufacturing, Food service and restaurants, Retail and grocery, Snack food production, Nutraceutical and supplement manufacturing |
|---|
Sourcing risks
| Risk | Mitigation |
|---|---|
Heavy metal accumulation Food safetyHigh Seaweed can absorb arsenic, lead, or cadmium from seawater, posing a health risk if consumed in large quantities. | Source from clean waters, test lots for heavy metals, and limit intake through portion guidance. |
Ocean warming and acidification ClimateMedium Rising sea temperatures and acidification can affect growth rates and quality of wild and farmed seaweed. | Diversify sourcing regions, support resilient farming practices, and monitor environmental conditions. |
Microbial contamination Food safetyMedium Pathogens like Vibrio or E. coli can be present in fresh or improperly dried seaweed, causing foodborne illness. | Ensure proper washing, drying, and storage; use heat treatment where applicable. |
Edible Seaweed Questions
- What forms of edible seaweed are classified as fit for human consumption?
- Edible seaweed is classified as seaweeds and other algae that are fresh, chilled, frozen or dried, whether or not ground, and are fit for human consumption.
- How should edible seaweed be stored to maintain quality?
- Edible seaweed should be kept in a cool, dry environment; fresh or chilled seaweed requires refrigeration, while dried seaweed should be stored in airtight containers away from moisture and heat.
- What are common processing steps for edible seaweed before it reaches the market?
- Typical processing includes cleaning, washing, optional blanching, followed by drying or freezing, and finally grinding or cutting if a ground form is required.