A powder of the leaf of kumaizasa (Sasa senanensis), a dwarf bamboo grass that grows wild in Hokkaido, Japan. The leaves are washed, dried and milled with nothing added, giving a green powder with a matcha-like taste; a lot analysis measured 67.3 g of dietary fibre per 100 g. Supplied in 350 mesh and 120 mesh grades for green drink powders, granules, tablets and capsules.
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 powder is made in Japan from the leaves of kumaizasa that grows wild in Hokkaido. The process is short and physical: the leaf is washed, dried and milled, with nothing added, so the powder is the whole dried leaf rather than an extract.
Step 1 · Hokkaido, Japan
Leaves of wild kumaizasa, chosen for their large, thick leaf blades
Step 2 · leaf part
The leaf part of the plant is carefully washed
Step 3 · dried leaf
The washed leaves are dried before milling
Step 4 · 100% leaf, nothing added
Milled into powder by a process designed to keep the flavour of the leaf
Step 5 · 350 mesh or 120 mesh
Two particle sizes, the 350 mesh grade being the finer grind
Step 6 · 10 kg
Shelf life 1 year from manufacture, 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.
The 350 mesh grade is the finer grind of the two. Tell us whether you are making a drink powder, tablets or capsules, and we send a sample of the grade that fits.
That is the reference daily amount and the dose used in a two-week human study. It is more than one or two capsules hold, so plan a stick pack, a scoop of drink powder, granules or a tablet serving. One kilogram gives about 238 servings at that level.
A dried wild-plant powder is usually checked for heavy metals and microbial counts by the importer. Ask for the lot data before you order and check it against the limits of your market.
Fibre and digestive wording is regulated differently in the USA, the Gulf, Australia and the CIS. The study on this powder describes what was measured; the wording on your label is set by your market and your regulatory adviser.
No certificate is on file for this powder. In the UAE a halal certificate is required for supplements, so 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.
Kumaizasa Bamboo Grass Leaf Powder is the dried, milled leaf of Sasa senanensis, a dwarf bamboo grass that grows wild in Hokkaido, Japan. It is a whole-leaf ingredient, not an extract, and its main component is dietary fibre: 67.3 g per 100 g in a lot analysis. Iizuka Shoukai supplies it from Japan to brand owners and contract manufacturers.
The powder is a fibre-rich green base with a mild, matcha-like taste. It can be taken as aojiru, the Japanese green drink powder stirred into water, and the reference daily amount of 4,200 mg sits easily in one stick pack or scoop. In a green blend it combines with other Japanese leaf powders such as Barley Young Leaf Extract Powder or Organic Ashitaba Powder.
Granules, tablets and hard capsules are the intended supplement formats. Because the taste is close to matcha, the powder also works in ordinary foods such as bread, noodles and cookies. At 4,200 mg per day it takes several capsules, so stick packs, drink powders, granules and tablets are the practical choices where the daily amount should sit in one serving.
Tell us your format, target market and the other ingredients in the formula. We confirm the mesh grade, the documents your market needs and the lot data before you commit to a trial. 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; see our Japanese supplement ingredients and contract manufacturing.
Kumaizasa, Sasa senanensis (Fr. et Sav.) Rehder, is a dwarf bamboo of the grass family, Poaceae. It is an evergreen plant of the cool-temperate regions of eastern Asia, found in Japan, Sakhalin, the Kuril Islands and parts of the Korean peninsula, and it can dominate the understory of beech forests (J Plant Res 2021; 134(2): 209-221). Hokkaido is one of its main growing areas, and it is often said that about three quarters of Japan's wild Sasa by weight grows there.
The plant stays green through the northern winter. Most of its tissues, from leaves to rhizomes, survive frost by deep supercooling, keeping the water inside unfrozen well below zero; the cold hardiness of the leaf blades rises from about -11 °C in August to about -20 °C in December (Front Plant Sci 2015; 5: 791). The leaves that overwinter under snow keep photosynthesising after snowmelt, which matters for the plant in early spring (J Plant Res 2024; 138(2): 215-230).
In Japanese trade the leaf powder is labelled both as kumaizasa powder and as kumazasa powder. Botanically these are two species of the same genus: kumaizasa is Sasa senanensis, while kumazasa is Sasa veitchii, as Japan's National Institutes of Biomedical Innovation, Health and Nutrition points out in its ingredient database. On an export label and in a registration file, name the species, Sasa senanensis, so that the two match.
Sasa leaves have long been used in Japan to wrap food, for example sasa-dango rice dumplings and sasa-zushi, sushi pressed in a bamboo leaf, because the leaf helps keep food fresh. The plant also appears in the classic Chinese materia medica Bencao Gangmu. In Japan kumaizasa is not on the list of ingredients used exclusively as medicines, so the leaf is handled as a food ingredient.
The main component is dietary fibre: a lot analysis by a Japanese food analysis laboratory found 67.3 g per 100 g of dried powder. The fibre is holocellulose, the structural carbohydrate of the plant cell wall, made of cellulose and hemicellulose; in the human study described below, 4.2 g of powder supplied 2.2 g of holocellulose. The product sheet also lists, per 100 g, 210 mg calcium, 73.6 mg magnesium, 20.1 mg iron, 12,100 µg carotene as beta-carotene equivalent and 15.6 mg vitamin E as alpha-tocopherol. At 4,200 mg per day that is about 9 mg calcium and 0.8 mg iron, so treat the powder as a fibre ingredient rather than a mineral or vitamin source.
Most laboratory work on Sasa senanensis uses extracts of the leaf. A long series of cell studies used an alkaline extract and described it as a complex of lignin, carbohydrate and chlorophyll-derived components (In Vivo 2010; 24(5): 735-743), and commercial leaf extracts differ from one another in composition (In Vivo 2012; 26(2): 259-264). An extract carries soluble compounds and leaves most of the fibre behind; this powder is the opposite, the whole leaf with its fibre. Use the extract literature to understand the plant, and use the data for this powder 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.
A randomised, double-blind, placebo-controlled study in Japan enrolled 77 healthy adults aged 20 to 64 who tended towards infrequent bowel movements. The test group (38 people) took 4.2 g of the powder a day, stirred into about 150 mL of water or hot water, for two weeks; the placebo group (39 people) took dextrin. Bowel-movement frequency, stool characteristics including odour, and abdominal condition were assessed by questionnaire with visual analogue scales (Functional Foods in Health and Disease 2019; 9(5): 341-356). Read the full paper for the results by endpoint before you rely on it.
A 28-day repeated-dose toxicity study and a micronucleus test were run on the powder, with no changes attributable to it. Ask for the lot data on heavy metals and microbial counts and check them against the limits of your market.
Plan it as a gram-level fibre ingredient. The 350 mesh grade is the finer grind of the two. Fibre powders take up moisture, so check flow and tablet hardness in a pilot batch and protect finished packs from humidity.
Start at the minimum order. Free sample. Specification, SDS and lot CoA on request.
Request a sample or quotationKumaizasa Bamboo Grass Leaf Powder is the dried, milled leaf of Sasa senanensis, a dwarf bamboo grass that grows wild in Hokkaido, Japan. It is a whole-leaf ingredient, not an extract, and its main component is dietary fibre: 67.3 g per 100 g in a lot analysis. Iizuka Shoukai supplies it from Japan to brand owners and contract manufacturers.
The powder is a fibre-rich green base with a mild, matcha-like taste. It can be taken as aojiru, the Japanese green drink powder stirred into water, and the reference daily amount of 4,200 mg sits easily in one stick pack or scoop. In a green blend it combines with other Japanese leaf powders such as Barley Young Leaf Extract Powder or Organic Ashitaba Powder.
Granules, tablets and hard capsules are the intended supplement formats. Because the taste is close to matcha, the powder also works in ordinary foods such as bread, noodles and cookies. At 4,200 mg per day it takes several capsules, so stick packs, drink powders, granules and tablets are the practical choices where the daily amount should sit in one serving.
Tell us your format, target market and the other ingredients in the formula. We confirm the mesh grade, the documents your market needs and the lot data before you commit to a trial. 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; see our Japanese supplement ingredients and contract manufacturing.
Kumaizasa, Sasa senanensis (Fr. et Sav.) Rehder, is a dwarf bamboo of the grass family, Poaceae. It is an evergreen plant of the cool-temperate regions of eastern Asia, found in Japan, Sakhalin, the Kuril Islands and parts of the Korean peninsula, and it can dominate the understory of beech forests (J Plant Res 2021; 134(2): 209-221). Hokkaido is one of its main growing areas, and it is often said that about three quarters of Japan's wild Sasa by weight grows there.
The plant stays green through the northern winter. Most of its tissues, from leaves to rhizomes, survive frost by deep supercooling, keeping the water inside unfrozen well below zero; the cold hardiness of the leaf blades rises from about -11 °C in August to about -20 °C in December (Front Plant Sci 2015; 5: 791). The leaves that overwinter under snow keep photosynthesising after snowmelt, which matters for the plant in early spring (J Plant Res 2024; 138(2): 215-230).
In Japanese trade the leaf powder is labelled both as kumaizasa powder and as kumazasa powder. Botanically these are two species of the same genus: kumaizasa is Sasa senanensis, while kumazasa is Sasa veitchii, as Japan's National Institutes of Biomedical Innovation, Health and Nutrition points out in its ingredient database. On an export label and in a registration file, name the species, Sasa senanensis, so that the two match.
Sasa leaves have long been used in Japan to wrap food, for example sasa-dango rice dumplings and sasa-zushi, sushi pressed in a bamboo leaf, because the leaf helps keep food fresh. The plant also appears in the classic Chinese materia medica Bencao Gangmu. In Japan kumaizasa is not on the list of ingredients used exclusively as medicines, so the leaf is handled as a food ingredient.
The main component is dietary fibre: a lot analysis by a Japanese food analysis laboratory found 67.3 g per 100 g of dried powder. The fibre is holocellulose, the structural carbohydrate of the plant cell wall, made of cellulose and hemicellulose; in the human study described below, 4.2 g of powder supplied 2.2 g of holocellulose. The product sheet also lists, per 100 g, 210 mg calcium, 73.6 mg magnesium, 20.1 mg iron, 12,100 µg carotene as beta-carotene equivalent and 15.6 mg vitamin E as alpha-tocopherol. At 4,200 mg per day that is about 9 mg calcium and 0.8 mg iron, so treat the powder as a fibre ingredient rather than a mineral or vitamin source.
Most laboratory work on Sasa senanensis uses extracts of the leaf. A long series of cell studies used an alkaline extract and described it as a complex of lignin, carbohydrate and chlorophyll-derived components (In Vivo 2010; 24(5): 735-743), and commercial leaf extracts differ from one another in composition (In Vivo 2012; 26(2): 259-264). An extract carries soluble compounds and leaves most of the fibre behind; this powder is the opposite, the whole leaf with its fibre. Use the extract literature to understand the plant, and use the data for this powder 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.
A randomised, double-blind, placebo-controlled study in Japan enrolled 77 healthy adults aged 20 to 64 who tended towards infrequent bowel movements. The test group (38 people) took 4.2 g of the powder a day, stirred into about 150 mL of water or hot water, for two weeks; the placebo group (39 people) took dextrin. Bowel-movement frequency, stool characteristics including odour, and abdominal condition were assessed by questionnaire with visual analogue scales (Functional Foods in Health and Disease 2019; 9(5): 341-356). Read the full paper for the results by endpoint before you rely on it.
A 28-day repeated-dose toxicity study and a micronucleus test were run on the powder, with no changes attributable to it. Ask for the lot data on heavy metals and microbial counts and check them against the limits of your market.
Plan it as a gram-level fibre ingredient. The 350 mesh grade is the finer grind of the two. Fibre powders take up moisture, so check flow and tablet hardness in a pilot batch and protect finished packs from humidity.
Not botanically. Both are dwarf bamboo grasses of the genus Sasa, and in Japanese trade the leaf powder is labelled either way, but kumaizasa is Sasa senanensis and kumazasa is Sasa veitchii. This powder is made from Sasa senanensis that grows wild in Hokkaido. Name the species on your label and in your registration file so that they match.
Iizuka Shoukai supplies Kumaizasa Bamboo Grass Leaf Powder from a 10 kg minimum order, packed 10 kg per pack in a 350 mesh or 120 mesh grade, 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 50 g evaluation sample is available for registered companies developing a product.
The reference daily amount is 4,200 mg, the same dose used in a two-week human study, so one kilogram covers about 238 daily servings. The intended formats are green drink powders, granules, tablets and hard capsules; because the daily amount is more than one or two capsules hold, stick packs, drink powders, granules and tablets are the practical choices. The matcha-like taste also suits bread, noodles and cookies.
That depends on your market, not on the ingredient. A two-week placebo-controlled study in Japan measured bowel-movement frequency, stool characteristics and abdominal condition in adults who tended towards infrequent bowel movements, and in Japan the evidence was prepared for the Foods with Function Claims system, which applies in Japan only. Digestive wording is regulated in most markets. We describe what was studied and leave the claim wording to you and your regulatory adviser.
