Structure/function claims for dietary supplements and conventional foods look deceptively similar on the surface, but the two frameworks that govern them are genuinely different. The same ingredient can support a broader claim on a supplement label than it can on a conventional food label, and understanding why comes down to two different regulatory pathways with different requirements for notification, documentation, and evidence.
Getting this distinction right matters when you’re building a label and working against a launch timeline, since a claim that’s compliant in one category can fall short of the standard in the other. This post breaks down where the two frameworks align, where they diverge, and what that means for how you approach substantiation and label review.
What Counts as a Structure/Function Claim
A structure/function claim describes the role a nutrient or ingredient plays in the normal structure or function of the body, without diagnosing, treating, curing, or preventing disease. That distinction is what keeps a claim out of drug territory, which would require FDA pre-market approval. “Calcium builds strong bones” is a textbook example. So is a claim that fibre supports bowel regularity.
You can review FDA’s official guidance on structure/function claims for the complete framework both categories fall under.
| Dietary Supplements | Conventional Foods | |
| Legal basis | DSHEA (1994) | General FD&C Act truthfulness standard |
Claim focus
| Nutritive or non-nutritive effects | Effects tied to nutritive value only |
FDA notification
| Required within 30 days of first marketing the claim | Not required |
Label disclaimer
| Mandatory, with specific wording and placement | Not required |
| Evidence standard | Competent and reliable scientific evidence | Competent and reliable scientific evidence |
The practical takeaway is that supplements have more room to make claims based on non-nutritive effects, while conventional food products are limited to claims that trace back to a nutrient’s nutritive value. That’s the distinction that trips up teams working across both product types with the same ingredient.
Where the Two Frameworks Overlap: Substantiation
Every structure/function claim needs substantiation before it appears on a label, and that requirement doesn’t stop at the label. FDA and the Federal Trade Commission apply the same underlying standard, competent and reliable scientific evidence, but FDA governs what’s on the physical label while FTC governs how the product is advertised and marketed, including your website and social channels. A claim that’s compliant on the label can still create exposure if the marketing language around it goes further than the evidence supports.
FTC has defined that standard as research conducted and evaluated objectively by qualified experts, using methods generally accepted in the relevant field. For most health-related efficacy claims, that generally means randomized controlled trials in human subjects, tested at the dose and form actually being sold. A single favourable study rarely meets that bar on its own, and the evidence needs to be in place before the claim goes out, not assembled afterward.
Quality Smart Solutions works with health and consumer product companies on exactly this kind of evidence package through its health claim substantiation service, building documentation early in development rather than scrambling for it after a claim is already on shelves.
How FDA Distinguishes a Disease Claim from a Structure/Function Claim
FDA’s Small Entity Compliance Guide sets out specific criteria for telling the two apart, and product naming is one of the most common places companies cross the line without realizing it. A name that references a disease directly, or that uses language like “cure,” “treat,” “correct,” or “prevent,” functions as an implied disease claim regardless of what the rest of the label says.
FDA’s own examples include names like “CarpalHealth” or “CircuCure,” since each implies treatment of a specific condition through the name alone. Even a name built around a symptom rather than a diagnosis can cross the line depending on context. A product called “Soothing Sleep” could be read as a claim to treat insomnia unless other label language makes clear it addresses occasional sleeplessness rather than a diagnosed disorder.
Ingredient references carry similar risk. If an ingredient is primarily known to consumers through its use in drug products, referencing that ingredient on a food or supplement label can itself function as an implied disease claim, even without any accompanying text describing what it does.
This kind of exposure usually shows up earliest at the naming and branding stage, well before a finished label reaches review, which is why claim risk is easier to manage as part of early product development rather than as a final check before launch.
FAQs on Structure/Function Claims
Do structure/function claims need to change when a product is imported into the United States from another country?
It’s a common assumption that imported products get a different set of rules, but FDA applies the same structure/function claim standards regardless of where the product is manufactured. The 30-day notification requirement for supplements and the nutritive value standard for conventional foods both apply to imported goods the same way they apply to domestic ones. Coordinating claim documentation with your U.S. Agent or FSVP agent ahead of shipment keeps this from becoming a bottleneck at the border.
If the same ingredient appears in both a conventional food product and a supplement, do I need separate substantiation packages for each?
It might seem like one strong substantiation file should cover an ingredient across every product it appears in, but that’s not how it works. Substantiation has to match the specific claim as worded and the specific product category it appears on, so a conventional food product and a supplement making related claims typically each need their own documented evidence trail. Building both packages side by side during development, rather than one after the other, usually saves time overall.
Where exactly does the disclaimer need to appear on a dietary supplement label?
It’s easy to assume any placement is fine as long as the disclaimer text is present somewhere, but FDA has specific expectations for how it’s displayed. The disclaimer needs to be prominently displayed and in boldface type so it isn’t easily overlooked. Building disclaimer placement into your label template at the design stage, rather than fitting it in at the last minute, keeps this from becoming a rework item late in your review process.
Key Takeaways
- Structure/function claims describe how a nutrient or ingredient supports normal body structure or function, without implying disease treatment or prevention.
- Dietary supplements require FDA notification within 30 days of first marketing the claim, plus a mandatory label disclaimer. Conventional foods require neither.
- Supplement claims can cover non-nutritive effects; conventional food claims must tie back to a nutrient’s nutritive value.
- Substantiation is required in both categories, based on the totality of the evidence rather than a single study.
- Product category, not the ingredient itself, determines which framework applies to your claim.
Putting It All Together
Getting structure/function claims for food ingredients and dietary supplements right before your label is finalized saves you a rework later, and it’s exactly the kind of review our team works through with clients regularly. Explore our health claim substantiation consultation services or get in touch to talk through where your product fits.
