Corn masa flour
Corn masa flour suppliers and sourcing guide
Corn masa flour is dried, ground nixtamalized corn. Whole corn kernels (Zea mays) are cooked and steeped in water with food-grade lime (calcium hydroxide), which loosens the hull and changes the starch and protein; the corn is then washed, ground into masa, dried and milled. Brands buy white, yellow and blue corn masa flours in fine to coarse grinds for tortillas, tortilla chips, tamales and snacks.
- Category
- Food staples and powders
- Also known as
- Masa harina · Nixtamalized corn flour · Instant corn masa flour · Zea mays
- Facts checked
- November 2026
Forms and grades of corn masa flour
Suppliers sell different products under the same name. Specify the one you need.
White, yellow and blue corn
Masa flours from different corn types, which differ in color, flavor and the finished product they suit.
Fine grind
For table tortillas and other products that need a smooth dough.
Coarse grind
For tortilla chips, tamales and snacks with more texture.
Enriched
Masa flour with added iron, B vitamins and, in some grades, folic acid.
Organic or non-GMO
Made from certified organic or non-GMO verified corn.
What to check on the COA
Compare each result with your own specification when the lot arrives.
- Moisture
- Oven moisture, usually held low for shelf life.
- Granulation
- Sieve analysis, which sets dough texture and how the flour suits tortillas versus chips.
- pH and calcium
- pH of a slurry and calcium content, which reflect how much lime remained after washing.
- Mycotoxins
- Aflatoxins and fumonisins by HPLC or validated rapid tests, since both occur in corn.
- Water absorption and viscosity
- Water absorption or a pasting profile, which tell how much water the dough will take.
- Microbiology
- Total plate count, yeast and mold, coliforms and E. coli.
Storage, lots and expiry
Storage and shelf life
Store masa flour sealed in a cool, dry area with pest control; because it is made from whole corn it contains germ oil and can turn stale or rancid over months. Keep it away from strong odors. Shelf life is set by the supplier's specification.
Lots and expiry dates
Granulation, color, water absorption and pH vary by corn lot and mill. Record mycotoxin results, granulation and corn origin for each lot, and keep GMO status documents on file if you make non-GMO claims.
Regulatory status
Facts from regulators and standards bodies, each linked to its source.
21 CFR 172.345 permits folic acid to be added to corn masa flour at not more than 0.7 milligrams per pound of corn masa flour.
Source: ecfr.gov (opens in a new tab)21 CFR 184.1205 affirms calcium hydroxide, also known as slaked lime, as GRAS for use in food with no limitation other than current good manufacturing practice.
Source: ecfr.gov (opens in a new tab)21 CFR 101.91 allows a "gluten-free" claim on a food that inherently does not contain gluten only when any unavoidable presence of gluten is below 20 ppm.
Source: ecfr.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.
Corn masa flour suppliers
Manufacturers and distributors whose own websites say they sell it.
We are checking corn masa flour 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 corn masa flour? Request a listingFrequently asked questions
What forms of corn masa flour can brands buy?
Common forms include white, yellow and blue corn, fine grind, coarse grind, enriched and organic or non-GMO. Ask each supplier for the specification sheet of the exact grade they quote.
What should the COA for corn masa flour include?
Expect moisture, granulation, pH and calcium, mycotoxins, water absorption and viscosity and microbiology, each with its method, specification and result for that lot.
How should corn masa flour be stored?
Store masa flour sealed in a cool, dry area with pest control; because it is made from whole corn it contains germ oil and can turn stale or rancid over months. Keep it away from strong odors. Shelf life is set by the supplier's specification.
What is the regulatory status of corn masa flour?
21 CFR 172.345 permits folic acid to be added to corn masa flour at not more than 0.7 milligrams per pound of corn masa flour. 21 CFR 184.1205 affirms calcium hydroxide, also known as slaked lime, as GRAS for use in food with no limitation other than current good manufacturing practice. 21 CFR 101.91 allows a "gluten-free" claim on a food that inherently does not contain gluten only when any unavoidable presence of gluten is below 20 ppm.
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