A hot-water extract of the edible brown seaweed Ecklonia stolonifera, known in Japan as tsuru-arame, made in Japan from seaweed harvested off the coast of Aomori Prefecture and powdered. The producer's human study used 2,160 mg per day, and the powder is intended for granules, tablets and capsules. Packed in 1 kg aluminium bags, with a shelf life of 4 years unopened.
Tell us what you are developing and which documents you need. We reply from Japan within one working day with the product specification, SDS and the CoA of the current lot.
The extract is made in Japan from tsuru-arame harvested off the coast of Aomori Prefecture. The process is short: harvest, drying, hot-water extraction of the leaf and powdering. Water is the extraction solvent; no organic solvent appears in the producer's process description.
Step 1 · Aomori Prefecture
Tsuru-arame is harvested from the sea by local fishermen
Step 2 · after harvest
The harvested seaweed is hung to dry
Step 3 · leaf, hot water
The leaf (blade) of the seaweed is extracted with hot water
Step 4 · extract powder
The extract is made into a powder for granules, tablets and capsules
Step 5 · 1 kg aluminium bag
Packed in aluminium bags; shelf life 4 years unopened
The grade on this page. Other grades, where available, are specified on request.
Example lot values are published in the developer's guide below. They are an example, not a specification; your lot's CoA governs.
A Japanese trading company selling directly to brand owners and contract manufacturers. No distributor layer between you and the documents.
Every shipment travels with the Certificate of Analysis of its own lot, with the measured values and the full safety panel.
A small first order lets you run a pilot batch before committing to bulk. Larger volumes are quoted by volume and delivery terms.
For registered companies developing a product. Tell us the format you plan and we will say honestly what to expect.
After payment is received. Freight quoted on request. Specification and SDS before you order, CoA with the goods.
If you are comparing ingredients for a new SKU, these questions separate one material from another quickly.
Brown seaweeds carry iodine and arsenic, and the limits for both differ by market. Ask for the lot data before you fix the serving size.
That is the amount used in the producer's human study. It is more than one standard capsule holds, so plan a multi-capsule or tablet serving, granules or a stick pack. One kilogram gives about 460 servings at that level.
Weight, fat and blood-glucose wording is regulated differently in the USA, the Gulf, Australia and the CIS. The producer's studies describe what was measured; the wording on your label is set by your market and your regulatory adviser.
The seaweed has a long food history in Japan, but a concentrated extract can be assessed separately from the whole seaweed. Check the status for your destination before the first order.
No certificate is on file for this extract. If your market or brand needs one, ask us before you order.
Tell us at the inquiry stage which parameters your importer expects on the CoA, and whether you need an SDS, allergen or GMO statement.
What each component is, what the processing changes, and what published research on the raw material has examined. No health claims; references on request.
Ecklonia Stolonifera Extract Powder is a Japanese hot-water extract of tsuru-arame, an edible brown seaweed of the kelp family harvested off the coast of Aomori Prefecture. It is a whole-extract ingredient rather than an isolated compound, used at gram level: the producer's human study used 2,160 mg per day. Iizuka Shoukai supplies it from Japan to brand owners and contract manufacturers.
The producer positions the extract for weight-management and metabolic concepts. Its own research examined two digestive enzymes in vitro, alpha-glucosidase for carbohydrates and pancreatic lipase for fats, a sucrose-load test in rats, and abdominal fat area measured by CT in a small open human study. Independent research on the seaweed centres on its phlorotannins, polyphenols found only in brown algae. In a formula it is usually combined with ingredients studied around other mechanisms, for example Ascophyllan Extract Powder, researched around the intestinal hormone GLP-1, or Capsinoid Granules, researched around energy expenditure.
The producer's intended formats are granules, tablets and capsules. At 2,160 mg per day the extract takes several capsules or a large tablet serving, so granules and stick packs are practical where the daily amount must sit in one serving. The extract has also been used in a soup-stock powder packed in sachets, a savoury format that suits a seaweed ingredient.
Tell us your format, target market and the other actives in the formula. We check the documents your market needs, including iodine and arsenic data for the lot, before you commit to a trial.
Ecklonia stolonifera Okamura is a brown seaweed of the kelp family, called tsuru-arame in Japanese. It grows along the Sea of Japan coast from Aomori in the north to northern Kyushu, and on the coasts of Korea. Its long, root-like holdfast creeps over rocks like a vine and sends up new shoots, which is where both the Japanese name and the species name come from. Coastal communities on the Sea of Japan have eaten it for generations (Mar Drugs 2022; 20(10): 607).
It is a close relative of Ecklonia cava and of Eisenia bicyclis (arame), and they share several of the same phlorotannins, such as eckol and dieckol. It is a different seaweed from Ascophyllum nodosum, the North Atlantic rockweed of another order of brown algae that is the source of ascophyllan; if you need a standardised ascophyllan extract, see our Ascophyllan Extract Powder.
A 2022 review lists polysaccharides, alginic acid, fucoxanthin, fatty acids and phlorotannins among its compounds and names the phlorotannins as the main active ingredients studied (Mar Drugs 2022; 20(10): 607). Phlorotannins are polyphenols built from phloroglucinol units and occur only in brown algae. In this seaweed the best-characterised are eckol, dieckol and phlorofucofuroeckol A; an HPLC method for all three found dieckol the most abundant in ethanol and ethyl acetate extracts (Arch Pharm Res 2010; 33(4): 539-544).
The solvent decides which compounds end up in an extract. Most published work on Ecklonia stolonifera uses ethanol extracts, solvent fractions or isolated phlorotannins. This product is a hot-water extract, and the producer lists polysaccharides as its main component group. Use the literature to understand the seaweed, and use the specification of this powder, not literature values, for your formula and your label.
The research below is listed so that your R&D and regulatory teams know what exists. None of it is a claim for the finished product; wording on a label is set by the rules of your market.
Phlorotannins isolated from Ecklonia stolonifera and Eisenia bicyclis were tested in vitro against alpha-glucosidase, the enzyme that splits disaccharides into monosaccharides in the small intestine, and against the enzyme PTP1B, with inhibition kinetics for each compound (Biosci Biotechnol Biochem 2011; 75(8): 1472-1480).
Five phlorotannins from the seaweed were tested in 3T3-L1 cells, a standard model of fat-cell formation, at 12.5-100 µM for lipid accumulation and adipocyte marker genes (Fitoterapia 2014; 92: 260-269). Extracts of the seaweed have been fed to mice on a high-fat diet, with lipolysis and thermogenic gene expression in fat tissue as endpoints (Cells 2020; 9(4): 871), and an ethanol extract was given for 16 weeks with body weight, fat mass and liver lipids measured (J Med Food 2024; 27(3): 242-249).
In vitro, the extract was tested against alpha-glucosidase at 30-1,000 µg/mL and against pancreatic lipase at 30-100 µg/mL. In rats given 2,500 mg/kg of sucrose, the extract at 100 and 300 mg/kg was compared with a control group, with blood glucose followed for 140 minutes and analysed as area under the curve. In an open study without a control group, 13 adults (9 men, 4 women) with a visceral fat area of 100 cm2 or more took 2,160 mg per day for two months; visceral and subcutaneous fat area were measured by abdominal CT, and blood tests were run for safety. This is a small pilot; it describes what was measured, not an expected result for a consumer.
The producer reports a 28-day repeated-dose oral toxicity study at 2,000 mg/kg, a micronucleus test at 500, 1,000 and 2,000 mg/kg and an Ames test, with no safety concern in any of them. Brown seaweeds carry iodine and arsenic, so request lot data for both and check them against the intake limits of your market.
Plan it as a gram-level ingredient. It suits tablets, granules and stick packs, and savoury powder formats such as soup stock. Iizuka Shoukai also runs OEM production of capsules, tablets and stick packs at our own plant in Gunma, Japan, if you would rather receive a finished private-label product than the raw powder; see our Japanese supplement ingredients and contract manufacturing.
Start at the minimum order. Free sample. Specification, SDS and lot CoA on request.
Request a sample or quotationEcklonia Stolonifera Extract Powder is a Japanese hot-water extract of tsuru-arame, an edible brown seaweed of the kelp family harvested off the coast of Aomori Prefecture. It is a whole-extract ingredient rather than an isolated compound, used at gram level: the producer's human study used 2,160 mg per day. Iizuka Shoukai supplies it from Japan to brand owners and contract manufacturers.
The producer positions the extract for weight-management and metabolic concepts. Its own research examined two digestive enzymes in vitro, alpha-glucosidase for carbohydrates and pancreatic lipase for fats, a sucrose-load test in rats, and abdominal fat area measured by CT in a small open human study. Independent research on the seaweed centres on its phlorotannins, polyphenols found only in brown algae. In a formula it is usually combined with ingredients studied around other mechanisms, for example Ascophyllan Extract Powder, researched around the intestinal hormone GLP-1, or Capsinoid Granules, researched around energy expenditure.
The producer's intended formats are granules, tablets and capsules. At 2,160 mg per day the extract takes several capsules or a large tablet serving, so granules and stick packs are practical where the daily amount must sit in one serving. The extract has also been used in a soup-stock powder packed in sachets, a savoury format that suits a seaweed ingredient.
Tell us your format, target market and the other actives in the formula. We check the documents your market needs, including iodine and arsenic data for the lot, before you commit to a trial.
Ecklonia stolonifera Okamura is a brown seaweed of the kelp family, called tsuru-arame in Japanese. It grows along the Sea of Japan coast from Aomori in the north to northern Kyushu, and on the coasts of Korea. Its long, root-like holdfast creeps over rocks like a vine and sends up new shoots, which is where both the Japanese name and the species name come from. Coastal communities on the Sea of Japan have eaten it for generations (Mar Drugs 2022; 20(10): 607).
It is a close relative of Ecklonia cava and of Eisenia bicyclis (arame), and they share several of the same phlorotannins, such as eckol and dieckol. It is a different seaweed from Ascophyllum nodosum, the North Atlantic rockweed of another order of brown algae that is the source of ascophyllan; if you need a standardised ascophyllan extract, see our Ascophyllan Extract Powder.
A 2022 review lists polysaccharides, alginic acid, fucoxanthin, fatty acids and phlorotannins among its compounds and names the phlorotannins as the main active ingredients studied (Mar Drugs 2022; 20(10): 607). Phlorotannins are polyphenols built from phloroglucinol units and occur only in brown algae. In this seaweed the best-characterised are eckol, dieckol and phlorofucofuroeckol A; an HPLC method for all three found dieckol the most abundant in ethanol and ethyl acetate extracts (Arch Pharm Res 2010; 33(4): 539-544).
The solvent decides which compounds end up in an extract. Most published work on Ecklonia stolonifera uses ethanol extracts, solvent fractions or isolated phlorotannins. This product is a hot-water extract, and the producer lists polysaccharides as its main component group. Use the literature to understand the seaweed, and use the specification of this powder, not literature values, for your formula and your label.
The research below is listed so that your R&D and regulatory teams know what exists. None of it is a claim for the finished product; wording on a label is set by the rules of your market.
Phlorotannins isolated from Ecklonia stolonifera and Eisenia bicyclis were tested in vitro against alpha-glucosidase, the enzyme that splits disaccharides into monosaccharides in the small intestine, and against the enzyme PTP1B, with inhibition kinetics for each compound (Biosci Biotechnol Biochem 2011; 75(8): 1472-1480).
Five phlorotannins from the seaweed were tested in 3T3-L1 cells, a standard model of fat-cell formation, at 12.5-100 µM for lipid accumulation and adipocyte marker genes (Fitoterapia 2014; 92: 260-269). Extracts of the seaweed have been fed to mice on a high-fat diet, with lipolysis and thermogenic gene expression in fat tissue as endpoints (Cells 2020; 9(4): 871), and an ethanol extract was given for 16 weeks with body weight, fat mass and liver lipids measured (J Med Food 2024; 27(3): 242-249).
In vitro, the extract was tested against alpha-glucosidase at 30-1,000 µg/mL and against pancreatic lipase at 30-100 µg/mL. In rats given 2,500 mg/kg of sucrose, the extract at 100 and 300 mg/kg was compared with a control group, with blood glucose followed for 140 minutes and analysed as area under the curve. In an open study without a control group, 13 adults (9 men, 4 women) with a visceral fat area of 100 cm2 or more took 2,160 mg per day for two months; visceral and subcutaneous fat area were measured by abdominal CT, and blood tests were run for safety. This is a small pilot; it describes what was measured, not an expected result for a consumer.
The producer reports a 28-day repeated-dose oral toxicity study at 2,000 mg/kg, a micronucleus test at 500, 1,000 and 2,000 mg/kg and an Ames test, with no safety concern in any of them. Brown seaweeds carry iodine and arsenic, so request lot data for both and check them against the intake limits of your market.
Plan it as a gram-level ingredient. It suits tablets, granules and stick packs, and savoury powder formats such as soup stock. Iizuka Shoukai also runs OEM production of capsules, tablets and stick packs at our own plant in Gunma, Japan, if you would rather receive a finished private-label product than the raw powder; see our Japanese supplement ingredients and contract manufacturing.
No. Ecklonia stolonifera is a kelp-family seaweed of the Sea of Japan, while ascophyllan is a polysaccharide described in Ascophyllum nodosum, a North Atlantic rockweed. The raw tsuru-arame contains alginic acid and fucoidan along with polyphenols, and the producer lists polysaccharides as the main component group of this hot-water extract, but the documents we hold describe it by species, part, solvent and use level, not by a single marker compound. If you need a standardised ascophyllan extract, see our Ascophyllan Extract Powder.
Iizuka Shoukai supplies Ecklonia Stolonifera Extract Powder from a 1 kg minimum order, packed in 1 kg aluminium bags, and sends the price for your volume with the quotation. Larger orders are quoted by volume and freight is quoted on request. Material ships from Japan 1-1.5 weeks after payment when stock is available; otherwise timing is confirmed in your quotation. Payment is 100% prepayment by SWIFT or Stripe. A free evaluation sample is available for registered companies developing a product, and we also offer OEM manufacturing of capsules, tablets and stick packs at our own plant in Gunma, Japan.
The producer's human study used 2,160 mg of the extract per day, so one kilogram covers about 460 daily servings. The producer's intended formats are granules, tablets and capsules; because the daily amount is above what one standard capsule holds, tablets, granules and stick packs are the practical choices, and the extract has also been used in a soup-stock powder in sachets. Check iodine and arsenic for the lot before you fix the serving size.
That depends on your market, not on the ingredient. The producer's studies examined alpha-glucosidase and pancreatic lipase in vitro, blood glucose after a sucrose load in rats, and visceral and subcutaneous fat area by CT in a small open human study without a control group. Claims about weight, fat and blood glucose are restricted in most markets. We describe what was studied and leave the claim wording to you and your regulatory adviser.
