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Soy fiber

Soy fiber suppliers and sourcing guide

Soy fiber is made from soybeans (Glycine max), most often from the inner cotyledon left after dehulled, defatted soy flakes are processed into soy protein. Cotyledon fiber is a mix of cellulose, hemicellulose and pectic substances that holds a lot of water; soy hull fiber, from the seed coats, is higher in cellulose. Both are dried and milled into cream-colored powders used in meat products, bakery and nutrition bars.

See suppliersWhat to ask for on the COA
Category
Fibers
Also known as
soy cotyledon fiber · soybean fiber · soy polysaccharide · Glycine max
Facts checked
November 2026

Forms and grades of soy fiber

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

  • Soy cotyledon fiber

    Fiber from the inner bean, a co-product of soy protein production; high water binding and mild flavor.

  • Soy hull fiber

    Milled seed coats, mostly insoluble fiber, darker in color.

  • Soluble soy polysaccharide

    Extracted soluble fiber used to keep proteins suspended in acidified milk drinks.

  • Non-GMO identity-preserved

    From non-GMO soybeans with identity preservation paperwork and PCR testing.

  • Organic

    From certified organic soybeans, 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, reported on an as-is or dry basis.
Protein
Residual protein by Dumas or Kjeldahl; shows how much of the powder is not fiber.
Moisture
Loss on drying; affects flow, caking and microbial stability.
Water holding capacity
Grams of water held per gram of fiber, the main functional spec for meat and bakery.
GMO testing
PCR screening for genetically modified soy events, for non-GMO claims.
Microbiology
Total plate count, yeast and mold, coliforms or Enterobacteriaceae, E. coli and Salmonella.

Storage, lots and expiry

Storage and shelf life

Keep soy fiber in sealed, lined bags in a cool, dry place away from strong odors, and re-seal opened bags to keep out moisture. Suppliers set a best-before date for unopened packaging. Store and label it as a soy allergen.

Lots and expiry dates

Protein carryover, water holding and color vary with the soy protein process the fiber came from, so check them on each COA. Keep GMO test results and identity-preservation documents with non-GMO lots.

Regulatory status

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

  • Health Canada's list of dietary fibres reviewed and accepted by its Food Directorate lists soy cotyledon fibre, derived from dehulled and defatted soybean flakes processed in mild alkaline conditions, as an accepted dietary fibre.

    Source: canada.ca (opens in a new tab)

  • FDA's food allergen labeling guidance lists soybeans among the major food allergens that food labels must declare.

    Source: 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.

Soy fiber suppliers

Manufacturers and distributors whose own websites say they sell it.

We are checking soy 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 soy fiber? Request a listing

Frequently asked questions

What forms of soy fiber can brands buy?

Common forms include soy cotyledon fiber, soy hull fiber, soluble soy polysaccharide, non-GMO identity-preserved and organic. Ask each supplier for the specification sheet of the exact grade they quote.

What should the COA for soy fiber include?

Expect total dietary fiber, protein, moisture, water holding capacity, gMO testing and microbiology, each with its method, specification and result for that lot.

How should soy fiber be stored?

Keep soy fiber in sealed, lined bags in a cool, dry place away from strong odors, and re-seal opened bags to keep out moisture. Suppliers set a best-before date for unopened packaging. Store and label it as a soy allergen.

What is the regulatory status of soy fiber?

Health Canada's list of dietary fibres reviewed and accepted by its Food Directorate lists soy cotyledon fibre, derived from dehulled and defatted soybean flakes processed in mild alkaline conditions, as an accepted dietary fibre. FDA's food allergen labeling guidance lists soybeans among the major food allergens that food labels must declare.

More fibers

All 32 fibers

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