Rice hull concentrate
Rice hull concentrate suppliers and sourcing guide
Rice hull concentrate is a fine powder made from the outer husks of rice (Oryza sativa), which are cleaned, milled and sieved; some suppliers also wash or heat-treat the hulls. Rice hulls are naturally high in silica and insoluble fiber. Brands buy it, often certified organic, as a plant-based flow and anticaking agent in capsules, tablets and powder blends, usually as a replacement for magnesium stearate or silicon dioxide, and some grades are sold as rice hull fiber for foods.
- Also known as
- Rice hull powder · Oryza sativa (rice) hull powder · Rice hull fiber · Rice husk powder
- Facts checked
- November 2026
Forms and grades of rice hull concentrate
Suppliers sell different products under the same name. Specify the one you need.
Flow-agent grade
Finely milled rice hull powder sold for capsule filling, tableting and powder flow.
Organic
Certified organic rice hull concentrate, widely used in organic-labeled supplements.
Fiber grade
Rice hull fiber sold as an insoluble fiber and bulking ingredient for foods.
Blends
Rice hull powder combined with other rice fractions, sold as all-rice flow agents.
What to check on the COA
Compare each result with your own specification when the lot arrives.
- Identity and description
- Appearance and microscopy of the milled hull, plus source confirmation.
- Moisture
- Loss on drying; damp powder flows poorly and is more prone to mold.
- Ash and silica
- Total ash and silica content by gravimetric analysis, which reflect the mineral share of the hull.
- Heavy metals
- Arsenic, cadmium, lead and mercury by ICP-MS; rice takes up arsenic and cadmium from soil and water, so these limits deserve attention.
- Particle size
- Sieve analysis, which affects flow performance and capsule fill.
- Microbiology
- Total plate count, yeast and mold, coliforms or E. coli, and Salmonella, which matter most when the ingredient goes uncooked into powders, capsules or tablets.
Storage, lots and expiry
Storage and shelf life
Store sealed in a cool, dry place off the floor and away from odors, since the fibrous powder absorbs moisture. Shelf life is set by the supplier; retest moisture and micro on older stock.
Lots and expiry dates
Ash, silica and arsenic levels can vary with growing region and crop year. Record origin and metals results per lot and set limits for arsenic and cadmium in your own specification.
Regulatory status
Facts from regulators and standards bodies, each linked to its source.
Health Canada's Natural Health Products Ingredients Database lists Oryza sativa (rice) hull powder, with the husk of Oryza sativa as the source material and anticaking agent and glidant among its non-medicinal purposes.
Source: webprod.hc-sc.gc.ca (opens in a new tab)GRN 478 (rice hull fiber, notified by SunOpta Ingredients Group as a source of dietary fiber) closed on Sep 14, 2015 with FDA having no questions.
Source: hfpappexternal.fda.gov (opens in a new tab)GRN 426 (rice hull fiber, notified by RIBUS, Inc. for use as an anticaking agent and flow aid in foods) closed in 2012 after FDA ceased to evaluate it at the notifier's request.
Source: hfpappexternal.fda.gov (opens in a new tab)
This is general information, not regulatory advice. Status differs by country and by how the ingredient is used, so check the rules for your product and market.
Rice hull concentrate suppliers
Manufacturers and distributors whose own websites say they sell it.
We are checking rice hull concentrate suppliers now
Every listing is checked against the supplier’s own website before it goes live, so this list fills in over the coming weeks. The specs and COA checklist above are ready today.
Sell rice hull concentrate? Request a listingFrequently asked questions
What forms of rice hull concentrate can brands buy?
Common forms include flow-agent grade, organic, fiber grade and blends. Ask each supplier for the specification sheet of the exact grade they quote.
What should the COA for rice hull concentrate include?
Expect identity and description, moisture, ash and silica, heavy metals, particle size and microbiology, each with its method, specification and result for that lot.
How should rice hull concentrate be stored?
Store sealed in a cool, dry place off the floor and away from odors, since the fibrous powder absorbs moisture. Shelf life is set by the supplier; retest moisture and micro on older stock.
What is the regulatory status of rice hull concentrate?
Health Canada's Natural Health Products Ingredients Database lists Oryza sativa (rice) hull powder, with the husk of Oryza sativa as the source material and anticaking agent and glidant among its non-medicinal purposes. GRN 478 (rice hull fiber, notified by SunOpta Ingredients Group as a source of dietary fiber) closed on Sep 14, 2015 with FDA having no questions. GRN 426 (rice hull fiber, notified by RIBUS, Inc. for use as an anticaking agent and flow aid in foods) closed in 2012 after FDA ceased to evaluate it at the notifier's request.
More starches, carriers and excipients
- MaltodextrinMaltodextrin (CAS 9050-36-6) · Hydrolyzed starch
- Tapioca starchCassava starch · Manihot esculenta starch
- Corn starchMaize starch · Zea mays starch
- Potato starchSolanum tuberosum starch · Starch, potato
- Rice starchOryza sativa starch · Starch, rice
- Modified food starchFood starch-modified · Modified starch
- Pregelatinized starchStarch, pregelatinized · Pregelatinised starch
- Tapioca maltodextrinCassava maltodextrin · Maltodextrin from tapioca
- Magnesium stearateOctadecanoic acid, magnesium salt · Magnesium octadecanoate
- Stearic acidOctadecanoic acid · C18:0 fatty acid
- Silicon dioxideSilica · Colloidal silicon dioxide
- Microcrystalline celluloseMCC · Cellulose gel
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