Allergen Labeling on Supplements: Major Allergens and Cross-Contact
Dietary supplements follow the same major allergen labeling law as foods. Here is what must be declared, where sesame and fish gelatin fit in, and how buyers should think about cross-contact statements.
Allergen questions reach supplement buyers from every direction: customers reading labels, retail compliance teams, and marketplace listing reviews. Allergen labeling supplements rules are not a separate system. Dietary supplements are regulated as a category of food, so the same federal allergen labeling law that covers a box of crackers covers a bottle of gummies or softgels.
This guide covers which allergens must be declared, how the declaration works on a Supplement Facts label, where ingredients like fish gelatin and soy lecithin fit in, and how to think about cross-contact.
The legal framework for allergen labeling supplements must follow
The Food Allergen Labeling and Consumer Protection Act of 2004 (FALCPA) requires foods, including dietary supplements, to declare major food allergens on the label. The FASTER Act of 2021 added sesame as the ninth major allergen, effective January 1, 2023. A product that contains an undeclared major allergen is considered misbranded, and undeclared allergens are one of the most common reasons for food and supplement recalls.
It helps to know what the law does not cover as well. Only the nine major allergens carry mandatory declaration requirements. Other sensitivities, such as corn, gluten outside of wheat, or specific colors, are handled through the full ingredient list rather than a Contains statement. A "gluten-free" claim is voluntary but, when used, must meet FDA's gluten-free definition of less than 20 parts per million gluten. And if you sell across North America, remember that Canada has its own priority allergen list, which includes mustard and sulphites, and its own rules for natural health products.
Major food allergens in supplements
The nine major food allergens supplements must declare, and some of the places they appear in formulas, are:
| Major allergen | Where it can appear in supplements |
|---|---|
| Milk | Whey or casein protein, lactose fillers, some probiotics grown on dairy media |
| Eggs | Egg-derived lecithin, some specialty ingredients |
| Fish | Fish oil, fish gelatin in softgels or gummies, fish collagen |
| Crustacean shellfish | Glucosamine and chitosan from shrimp or crab shells, krill oil |
| Tree nuts | Nut-based flavors, oils, or botanical carriers |
| Peanuts | Rare, but possible in flavors or oils |
| Wheat | Wheat germ oil, wheat starch, some grass powders |
| Soybeans | Soy lecithin in softgels, soy protein, mixed tocopherols from soy |
| Sesame | Sesame oil carriers, some seed blends |
Fish, crustacean shellfish, and tree nuts must be declared by species. "Contains: fish (tilapia)" is compliant. "Contains: fish" alone is not. FDA also periodically updates its guidance on which species count; for example, recent guidance narrowed the tree nut list, so check the current version rather than older references.
How allergens are declared on the label
FALCPA allows two ways to declare a major allergen:
- In the ingredient list, with the allergen source in parentheses after the ingredient, such as "lecithin (soy)" or "gelatin (fish)."
- In a separate "Contains" statement placed immediately after or next to the ingredient list, such as "Contains: milk, soy."
On a supplement label, dietary ingredients appear in the Supplement Facts panel and other ingredients appear in a list below it. If a major allergen appears in the Supplement Facts panel, its source can be identified there, or it can be covered by a Contains statement. The key requirement is that every major allergen present is clearly declared. Our overview of supplement label basics explains how these sections fit together.
Fish gelatin in a softgel shell is still fish, and the label has to say so, with the species.
Format-specific allergen issues
Different delivery formats bring different allergen considerations, which is one reason format choice matters beyond cost and consumer preference.
- Softgels: shells are usually bovine, porcine, or fish gelatin. Fish gelatin must be declared. Softgel fills often use soy lecithin or soybean oil.
- Gummies: gelatin gummies may use bovine or porcine gelatin, which are not major allergens. Pectin gummies avoid gelatin entirely. See pectin vs. gelatin gummies.
- Capsules: gelatin or plant-based HPMC shells rarely raise allergen issues, but fillers and flow agents should be reviewed.
- Powders: protein powders frequently contain milk or soy, and shared blending equipment raises cross-contact risk.
- Soft chews: often include milk-derived or other food ingredients in the base.
Sesame allergen labeling and the cross-contact problem
Sesame allergen labeling became mandatory in 2023, and it created an unexpected ripple. Some food manufacturers who could not guarantee sesame-free lines chose to add small amounts of sesame intentionally and declare it, rather than risk an undeclared allergen. FDA has said this practice is legal but noted it reduces options for people with sesame allergies. For supplement buyers, the lesson is to read declarations carefully on every new lot and label version.
What cross-contact means
Cross-contact happens when an allergen unintentionally ends up in a product that is not supposed to contain it, usually through shared equipment, shared air handling, or residue on utensils. Current good manufacturing practice under 21 CFR Part 111 requires manufacturers to prevent contamination, and that includes appropriate cleaning, scheduling, and segregation.
Precautionary statements
Statements like "may contain" or "produced in a facility that also processes" are voluntary. FDA has said they should be truthful and not misleading, and they are not a substitute for good manufacturing practices. They are also not standardized, so wording varies widely. Buyers selling into allergy-conscious channels should ask suppliers how these statements are decided.
Label version control matters here too. When a supplier changes a gelatin source, swaps a lecithin, or moves production to a different line, allergen declarations can change. Buyers should ask to be notified of formula and label changes and should compare new artwork against the previous version before accepting a first shipment.
A buyer's allergen checklist
- Confirm every major allergen in the formula is declared, with species for fish, shellfish, and tree nuts
- Ask for the source of lecithin, gelatin, oils, and tocopherols
- Request the supplier's allergen control program summary or allergen statement
- Ask whether any major allergens are run on shared lines, and how changeovers are validated
- Check whether precautionary statements are used and on what basis
- Recheck labels whenever a formula, supplier, or facility changes
Where RV Pharma fits
RV Pharma is a wholesale nutraceutical distributor supplying stock and private-label supplements to retailers, pharmacies, distributors, and e-commerce businesses. Supplement Facts panels for our stock gummies and softgels are published on our product pages, so your team can review ingredient and allergen information before placing an order.
Frequently asked questions
Do dietary supplements have to list allergens?
Yes. Dietary supplements are regulated as foods for allergen labeling, so FALCPA and the FASTER Act apply. Any of the nine major food allergens present must be declared, either in the ingredient list with the source in parentheses or in a Contains statement next to the ingredient list.
Is sesame a major allergen on supplement labels?
Yes. The FASTER Act made sesame the ninth major food allergen, with labeling required for products labeled on or after January 1, 2023. Supplements containing sesame, including sesame oil used as a carrier, must declare it just like any other major allergen.
Does gelatin need to be declared as an allergen?
It depends on the source. Bovine and porcine gelatin are not major allergens. Fish gelatin, commonly used in some softgels and gummies, is derived from fish, so it must be declared as a fish allergen, including the specific species, such as tilapia.
Are may contain statements required on supplements?
No. Precautionary allergen statements are voluntary in the U.S. and are not standardized. FDA expects them to be truthful and not misleading, and they cannot replace good manufacturing practices. Buyers should ask suppliers what controls and risk assessment support any statement used.
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