AskHACCP: Sub-Ingredients, Allergens, and the Food Safety System
Do you know everything that's in your seasoning blend?
A seasoning blend, sauce, or marinade may appear as one ingredient in your recipe, but what's inside it can affect far more than flavor. Sub-ingredients can introduce allergens, change labeling requirements, and even influence the safety of your finished product.
For food producers, understanding those ingredients isn't simply a labeling exercise. It's part of managing your formulation, suppliers, production process, and food safety system.
What Are Sub-Ingredients?
Sub-ingredients are the ingredients within a multi-ingredient component.
For example, a purchased soy sauce might contain water, soybeans, wheat, and salt. A seasoning blend could contain salt, spices, sugar, and milk powder.
The name "seasoning" alone does not tell your team everything it needs to know.
Maintain current specifications and allergen information for each purchased component and review the complete composition, including ingredients contained within other ingredients. Trade names, product names, and familiarity with a supplier are not substitutes for reviewing the actual formulation.
This becomes especially important when suppliers, ingredients, or formulations change.
Understanding the Nine Major Food Allergens
Food allergens are typically proteins that can trigger an immune response in sensitive individuals. For someone with a food allergy, even a small amount of the allergen can cause a serious reaction.
Under U.S. federal law, nine foods and food groups are recognized as major food allergens:
Milk
Eggs
Fish, such as salmon, cod, and tuna
Crustacean shellfish, such as shrimp, crab, and lobster
Tree nuts, such as almonds, walnuts, and pecans
Peanuts
Wheat
Soybeans
Sesame
Sesame became the ninth major food allergen on January 1, 2023, under the Food Allergy Safety, Treatment, Education, and Research (FASTER) Act. [2]
These allergens are not always obvious from the name of a purchased ingredient. Whey can introduce milk, soy sauce may contain wheat and soybeans, and seasoning blends or sauces may contain sesame, milk, or other allergenic ingredients.
This is why reviewing the complete composition of purchased ingredients matters. Identifying allergens is not only about what appears on the finished label. It also informs hazard analysis, allergen cross-contact prevention, sanitation practices, and production controls.
Although these nine account for the large majority of food allergies in the United States, other foods can also cause allergic reactions.
Reading the Ingredient Statement
For FDA-regulated foods, ingredients generally appear by common or usual name in descending order of predominance by weight.
When a food contains a multi-ingredient component, its sub-ingredients may generally be declared by naming the component and listing its individual ingredients in parentheses in descending order within that component. Another permitted approach is to incorporate those individual ingredients into the overall ingredient statement in their appropriate order of predominance in the finished food. [1, 3]
Consider this simplified example:
Ingredients: Water, soy sauce (water, soybeans, wheat, salt), sugar, garlic.
The soy sauce's position reflects the amount of soy sauce used in the product. The order inside the parentheses reflects the composition of the soy sauce itself.
This is only an illustration. The actual formulation, supplier documentation, applicable standards of identity, exemptions, and regulatory requirements determine the correct declaration.
Allergen labeling adds another layer. In this example, soy and wheat require appropriate declaration.
FDA and USDA-FSIS requirements are not identical.
For FDA-regulated packaged foods subject to federal allergen labeling requirements, major food allergen sources must be identified appropriately. Depending on the ingredients, allergen sources may be identified within the ingredient statement or through a separate "Contains" statement. When a "Contains" statement is used, it must identify all major food allergens present as ingredients. [1]
For USDA-FSIS-regulated meat, poultry, and egg products, ingredients containing allergens must be accurately declared in the ingredient statement. Separate allergen statements are generally voluntary and may provide additional clarity for consumers. [4, 5]
For certain allergens, including fish, crustacean shellfish, and tree nuts, FDA labeling requirements also call for identification of the applicable species or specific nut type. [1]
A "Contains" statement does not replace the requirement to accurately declare the ingredients that make up the food.
Where HACCP and Food Safety Come In
Undeclared allergens can present a serious chemical food safety hazard, particularly when formulation changes, ingredient substitutions, or ineffective production controls result in allergens being present without appropriate labeling.
If a seasoning introduces milk into a product, the hazard analysis and operating controls need to account for that ingredient even when milk is never separately handled or added on the production floor.
FSIS has specifically connected undeclared-allergen failures with supplier changes, formulation changes, products placed in the wrong packaging, incorrect labels, inadequately addressed hazards, and ineffective controls. [4]
Sub-ingredient information can also reveal other questions that need to be evaluated.
Does a blend contain an ingredient that introduces an additional biological or chemical hazard?
Has a preservative, acidulant, curing ingredient, salt concentration, or other functional ingredient changed?
Does the safety of the process depend on a formulation characteristic that could change when a supplier or ingredient changes?
The ingredient name alone cannot answer those questions. Intended use, formulation, supplier documentation, processing conditions, supporting evidence, and the applicable regulatory framework all matter.
The appropriate controls depend on the operation, identified hazards, and applicable regulatory requirements.
Under USDA-FSIS HACCP requirements, allergen hazards may be addressed through supported prerequisite programs or critical control points where justified by the hazard analysis. [4]
For FDA-regulated facilities subject to the Preventive Controls for Human Food requirements under 21 CFR Part 117, allergen controls may include measures to prevent allergen cross-contact and verify accurate finished-product labeling.
A Preventive Controls Qualified Individual (PCQI) must prepare or oversee preparation of the facility's food safety plan and perform or oversee certain other required activities under the regulation. [6, 7]
Both frameworks emphasize identifying hazards and implementing appropriate controls, although their specific regulatory requirements differ. Label verification is not automatically a critical control point.
The Substitution That Changes More Than the Recipe
Imagine a processor switching to a less expensive seasoning with the same flavor description.
The original blend contains no milk ingredient. The replacement contains whey.
If purchasing approves that substitution without a food safety and labeling review, production could begin using the new seasoning while the existing packaging remains unchanged.
The problem did not begin at the packaging line.
The ingredient substitution should have triggered a review of the supplier specification, allergen profile, formula, hazard analysis, operating controls, and finished label before the new ingredient entered production.
That is formulation control.
Now consider your own operation: If a supplier changed a seasoning formulation tomorrow, would your current system catch that change before the ingredient entered production?
Build the Review Into Daily Operations
Approve ingredients before use. Maintain current specifications, complete sub-ingredient information, and allergen declarations tied to the actual supplier and item being purchased.
Control substitutions and changes. Review new suppliers, ingredient replacements, reformulations, and specification changes before release to production.
Connect the records. Compare the approved formula, supplier specifications, allergen assessment, hazard analysis, and current label version.
Verify labels during production. Confirm the correct packaging and label at startup, product changes, and changeovers, with documented verification appropriate to the operation.
Respond to discrepancies. Hold affected product, determine the scope of the issue, correct the condition, and evaluate product already distributed when necessary.
The Label Is Part of the System
A finished label should reflect the food that is actually being produced.
That means the ingredient statement cannot operate separately from purchasing, formulation, supplier approval, allergen management, HACCP, preventive controls, and production.
Sub-ingredient review gives your team a more complete picture of the product it is making. It supports hazard analysis, reduces the risk of undeclared allergens, improves formulation control, and keeps the finished label aligned with the actual product.
At AgriForaging Compliance Services, we help food businesses connect those pieces. From ingredient and supplier review to labeling, HACCP, preventive controls, and production systems, the goal is not simply to create a compliant label. It is to build a system in which the formula, the process, and the label tell the same story.
Editorial References
[1] FDA. Guidance for Industry: Questions and Answers Regarding Food Allergens, Including the Food Allergen Labeling Requirements of the Federal Food, Drug, and Cosmetic Act (Edition 5). January 2025.
[2] FDA. Food Allergies: The Nine Major Food Allergens and the FASTER Act.
[3] FDA. 21 CFR 101.4, Food; Designation of Ingredients, particularly subsection (b)(2).
[4] USDA-FSIS. Directive 7230.1, Ongoing Verification of Product Formulation and Labeling Targeting the Nine Most Common ("Big 9") Food Allergens.
[5] USDA-FSIS. How Do You Know If a Food Contains a Major Allergen?
[6] FDA. 21 CFR 117.135(c)(2), Food Allergen Controls.
[7] FDA. 21 CFR 117.180, Requirements Applicable to a Preventive Controls Qualified Individual and a Qualified Auditor.
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