FALCPA and Dietary Supplements: Allergen Labelling for Supplement Brands on Shopify

Dietary supplements — including protein powders, vitamins, herbal products, and sports nutrition — are subject to FALCPA allergen labelling requirements in the United States. Many supplement brands overlook this, particularly when sourcing from contract manufacturers. Here's what you need to know.

FALCPA Applies to Supplements

The Food Allergen Labeling and Consumer Protection Act covers "food" as defined by the Federal Food, Drug, and Cosmetic Act — and dietary supplements fall under this definition. This means protein powders containing whey must declare milk, supplements containing soy lecithin must declare soy, and products containing wheat germ must declare wheat.

Common Allergens in Supplements

Whey protein and casein are derived from milk. Many protein blends include egg white protein. Soy is a common ingredient in plant-based protein powders and many vitamin formulations. Wheat germ oil, brewer's yeast, and certain herbal extracts may contain gluten. Magnesium stearate is sometimes derived from peanut or soy. Each of these must be checked and declared if they constitute a major allergen.

Contract Manufacturing and Allergen Responsibility

If you white-label supplements from a contract manufacturer, FALCPA compliance responsibility falls on the brand owner — the name on the label. This means you need your manufacturer's full ingredient specifications, including any processing aids and excipients, and you need to verify allergen declarations before you put your brand on a product and sell it through Shopify.

Shopify Product Pages for Supplement Brands

For supplements sold through Shopify, allergen information should be visible on the product page — don't rely on customers reading the physical label. SaltAI's Allergen Matrix app supports all nine major allergens and is compatible with supplement and wellness product categories.

Add FALCPA-compliant allergen declarations to your supplement Shopify store.

The Nine Major Allergens Under FALCPA and Sesame's Addition

FALCPA originally designated eight major food allergens: milk, eggs, fish, shellfish, tree nuts, peanuts, wheat, and soybeans. The FASTER Act of 2021 added sesame as the ninth major allergen, with mandatory declaration requirements taking effect from January 1, 2023. For supplement brands, this has real consequences — sesame oil is used in some softgel formulations, and sesame-derived ingredients appear in certain herbal blends and coating agents. If your supplement contains any sesame-derived ingredient, even in trace quantities as a processing aid, you are now required to declare it clearly on the label.

The declaration format under FALCPA gives you two compliant options. You can include the allergen name in parentheses within the ingredient list — for example, "lecithin (soy)" — or you can use a separate "Contains" statement immediately following the ingredient list, such as "Contains: Milk, Soy." Both approaches are valid, but you must be consistent and accurate across every SKU in your product range. Mixing approaches across your catalogue without care can create confusion, and any omission of a required allergen declaration exposes your brand to FDA enforcement action and, more importantly, puts customers at risk.

For Shopify supplement brands managing multiple SKUs — different protein flavours, stacked formulations, seasonal products — maintaining accuracy across all nine allergens is genuinely complex. Contract manufacturers may update their ingredient sources without notifying you promptly, which means a previously allergen-free product could change status without a corresponding label update. Building a routine review process and keeping a centralised allergen log tied to your Shopify product catalogue is the kind of operational discipline that protects both your customers and your business.

Excipients, Fillers, and Hidden Allergen Sources

The ingredients consumers see listed prominently on a supplement label — the active compounds, the branded ingredients, the headline nutrients — are rarely the whole picture. Supplements contain a significant number of functional excipients: binders, fillers, flow agents, coating materials, capsule shells, and preservatives. These ingredients perform essential manufacturing functions but are often overlooked in allergen reviews. Microcrystalline cellulose, for example, is generally allergen-free, but other common excipients such as lactose (a milk derivative) and certain stearates can carry allergen status depending on their source material and how they were processed.

Capsule shells present a specific issue worth examining carefully. Gelatin capsules are derived from animal collagen — typically bovine or porcine — and while gelatin is not currently a FALCPA-designated major allergen, fish gelatin capsules do introduce a fish allergen declaration requirement. Vegetable capsules made from hydroxypropyl methylcellulose are typically allergen-neutral, but you should still request a certificate of analysis from your manufacturer confirming this. The broader principle is that every single ingredient in your formulation, regardless of its function, must be assessed for allergen status before your label is finalised.

Processing aids add another layer of complexity. Under FDA regulations, processing aids that are present in a finished food at insignificant levels and that have no technical or functional effect in the finished product may not always appear on the ingredient list — but if they are derived from a major allergen, FALCPA still requires their declaration. This means that even if your contract manufacturer assures you a certain ingredient is a processing aid and "doesn't need to be listed," you should independently verify whether it is allergen-derived. Ask for full specification sheets, not just the finished product ingredient list, and document everything.

Cross-Contact Risks in Supplement Manufacturing

Cross-contact — the unintentional transfer of an allergen from one product or surface to another during manufacturing — is a significant concern in supplement production facilities. Many contract manufacturers produce dozens or even hundreds of different formulations in the same facility, and some of those formulations will contain major allergens. If your allergen-free protein powder is manufactured on shared equipment that also processes whey-based products, there is a realistic risk of milk cross-contact even if milk is not an ingredient in your formulation. This is not a theoretical concern: it is a documented cause of serious allergic reactions and product recalls.

FALCPA does not mandate "may contain" advisory statements — the voluntary warnings that appear on many food and supplement labels, such as "manufactured in a facility that also processes peanuts." However, the FDA strongly encourages their use when cross-contact is a genuine operational risk, and consumers with severe allergies rely on them heavily. If your contract manufacturer cannot demonstrate robust allergen segregation, cleaning validation protocols, and allergen testing procedures, that information is material to your labelling decisions. Requesting allergen management documentation from your manufacturer is a reasonable and necessary step in your compliance process.

For Shopify supplement brands, the implications extend to your online product pages. If your physical label carries an advisory statement about cross-contact, that information should be reproduced on your Shopify product listing. Customers with severe allergies frequently shop online precisely because it gives them more time to read and assess allergen information before committing to a purchase. Presenting incomplete information on your product page — even if the physical label is fully compliant — creates a mismatch that can mislead shoppers and potentially expose your brand to liability. Consistency between your physical and digital labelling is not optional.

Updating Your Shopify Listings When Formulations Change

Supplement formulations change. Contract manufacturers switch ingredient suppliers, active ingredient concentrations are adjusted, flavour profiles are reformulated, and coating materials are updated — often for entirely legitimate reasons related to cost, availability, or performance. Each of these changes carries allergen implications. A supplier switch that moves from a soy-derived carrier to a sunflower-derived carrier, for example, would allow you to remove a soy declaration — but only after you have verified the change through updated specification documentation, not simply on the basis of a verbal assurance.

The challenge for Shopify supplement brands is that these formulation changes often happen quietly and without triggering a formal notification from the manufacturer. Building a structured process for managing this is essential. This should include requesting advance notification clauses in your manufacturing agreements, conducting scheduled allergen reviews at defined intervals, and maintaining version-controlled records of your ingredient specifications linked to specific batch numbers and production dates. When a change occurs, your Shopify product pages and any associated marketing materials must be updated before the new formulation goes on sale — not after.

Using a dedicated allergen management tool integrated with your Shopify store makes this process significantly more manageable. Rather than maintaining allergen information in a separate spreadsheet that must be manually cross-referenced against your live product listings, a purpose-built tool allows you to update allergen declarations centrally and have those updates reflected consistently across your storefront. For supplement brands with large catalogues or frequent reformulations, this kind of systematic approach is the difference between compliance you can demonstrate and compliance you merely hope you have achieved. Allergen Matrix is built specifically for this kind of structured, scalable allergen management within Shopify.

Building Customer Trust Through Transparent Allergen Communication

Customers shopping for dietary supplements are, as a group, particularly health-conscious and often managing specific dietary requirements or medical conditions. Many supplement buyers are managing conditions such as lactose intolerance, celiac disease, or nut allergies, and they are actively seeking products that fit within their dietary parameters. Clear, accurate, and prominent allergen information is not just a regulatory requirement in this context — it is a genuine competitive differentiator. Brands that communicate allergen information transparently and thoroughly are more likely to earn and retain the trust of this audience.

Transparency in allergen communication means going beyond the minimum required declarations. It means proactively explaining what your product does and does not contain, being explicit about cross-contact risks where they exist, and making it easy for customers to find allergen information without having to hunt through multiple pages or zoom into small-print label images. On Shopify, this means allergen information should be prominently placed in your product description, ideally formatted in a way that is scannable — clear headings, structured lists, and unambiguous language — rather than buried in a block of dense text.

The reputational stakes are high. A single serious allergic reaction linked to an inaccurate or missing allergen declaration can result in FDA enforcement, product recalls, significant legal exposure, and lasting damage to your brand's reputation. Conversely, a track record of accurate, transparent allergen communication builds the kind of credibility that drives repeat purchases and word-of-mouth recommendations within health-conscious communities. Investing properly in allergen compliance is not a cost centre for supplement brands — it is a meaningful investment in long-term customer relationships.

Try Allergen Matrix free at saltai.app — no credit card required.