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Oat fiber

Oat fiber suppliers and sourcing guide

Oat fiber is an insoluble fiber made from oat hulls, the outer husk removed when oats are milled for food. The hulls are cooked or treated with alkali, often bleached with hydrogen peroxide to lighten the color, then washed, dried and ground to a fine white or tan powder that is mostly cellulose and hemicellulose. Bakers and meat processors buy it to add fiber, hold water and replace flour, choosing by particle length and color.

See suppliersWhat to ask for on the COA
Category
Fibers
Also known as
oat hull fiber · oat hull fibre · Avena sativa hull fiber · insoluble oat fiber
Facts checked
November 2026

Forms and grades of oat fiber

Suppliers sell different products under the same name. Specify the one you need.

  • Bleached oat hull fiber

    Peroxide-bleached, white to off-white, mild flavor; used in breads, tortillas and low-carb baking.

  • Unbleached oat fiber

    Tan to light brown, made without bleaching; used where color is not an issue.

  • Fiber length grades

    Short-fiber grades for smooth doughs and drinks, longer fibers for water binding in meat and bakery.

  • Gluten-free grades

    From hulls of oats handled to keep wheat, barley and rye out, supplied with gluten testing.

  • Organic

    Made from certified organic oat hulls without bleaching, under organic certification.

What to check on the COA

Compare each result with your own specification when the lot arrives.

Total dietary fiber
Total, soluble and insoluble fiber by AOAC 991.43 or 2011.25; commercial grades are usually above 85% total fiber.
Moisture
Loss on drying; affects flow and water binding.
Particle size or fiber length
Sieve analysis or laser diffraction to confirm the grade.
Water binding capacity
Grams of water held per gram of fiber, the main functional spec for bakery and meat.
Color and residual peroxide
Whiteness reading and a check that bleaching agent residues are gone, for bleached grades.
Microbiology
Total plate count, yeast and mold, coliforms or Enterobacteriaceae, E. coli and Salmonella.

Storage, lots and expiry

Storage and shelf life

Oat fiber is stable as a dry powder; keep it in sealed multiwall bags in a cool, dry area off the floor. It picks up moisture and odors from the room, so re-seal opened bags. Suppliers set a best-before date from manufacture, often one to two years for unopened bags.

Lots and expiry dates

Fiber length, water binding and whiteness can change between lots and between suppliers, which changes dough absorption, so record those values from each COA. Note whether the lot is bleached and keep gluten results on file for gluten-free products.

Regulatory status

Facts from regulators and standards bodies, each linked to its source.

  • GRN 261, for oat hull fiber notified by Grain Millers for use in bread, crackers, cereals, snacks, breaders and meat products, closed on Feb 3, 2009 with FDA having no questions.

    Source: hfpappexternal.fda.gov (opens in a new tab)

  • GRN 342, for oat hull fiber notified by J. Rettenmaier USA for use in comminuted meat and in whole muscle and comminuted poultry products, closed on Dec 23, 2010 with FDA having no questions.

    Source: hfpappexternal.fda.gov (opens in a new tab)

  • Health Canada's List of Permitted Food Additives with Other Accepted Uses permits hydrogen peroxide as a bleaching agent on oat hulls used to make oat hull fibre, at good manufacturing practice levels.

    Source: canada.ca (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.

Oat fiber suppliers

Manufacturers and distributors whose own websites say they sell it.

We are checking oat fiber 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 oat fiber? Request a listing

Frequently asked questions

What forms of oat fiber can brands buy?

Common forms include bleached oat hull fiber, unbleached oat fiber, fiber length grades, gluten-free grades and organic. Ask each supplier for the specification sheet of the exact grade they quote.

What should the COA for oat fiber include?

Expect total dietary fiber, moisture, particle size or fiber length, water binding capacity, color and residual peroxide and microbiology, each with its method, specification and result for that lot.

How should oat fiber be stored?

Oat fiber is stable as a dry powder; keep it in sealed multiwall bags in a cool, dry area off the floor. It picks up moisture and odors from the room, so re-seal opened bags. Suppliers set a best-before date from manufacture, often one to two years for unopened bags.

What is the regulatory status of oat fiber?

GRN 261, for oat hull fiber notified by Grain Millers for use in bread, crackers, cereals, snacks, breaders and meat products, closed on Feb 3, 2009 with FDA having no questions. GRN 342, for oat hull fiber notified by J. Rettenmaier USA for use in comminuted meat and in whole muscle and comminuted poultry products, closed on Dec 23, 2010 with FDA having no questions. Health Canada's List of Permitted Food Additives with Other Accepted Uses permits hydrogen peroxide as a bleaching agent on oat hulls used to make oat hull fibre, at good manufacturing practice levels.

More fibers

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