What is a structure-function claim?

A structure-function claim describes how an ingredient affects the normal structure or function of the body, without referring to a disease. Supports immune health, helps maintain healthy energy, and promotes joint comfort are structure-function claims. They are permitted on supplements when accompanied by the FDA disclaimer, because they describe normal function rather than treating a condition.

What is a disease claim?

A disease claim says or implies that a product diagnoses, treats, cures, mitigates, or prevents a disease. Treats anxiety, lowers cholesterol, prevents the flu, and relieves arthritis are disease claims. They are prohibited on products not approved as drugs, with or without a disclaimer, because they cross from describing normal function into claiming a medical effect.

Can a disclaimer make a disease claim allowed?

No. The FDA disclaimer permits a structure-function claim; it does not license a disease claim. Adding the disclaimer to treats diabetes does not make it allowed. The disclaimer's job is to accompany a permitted claim, not to rescue a prohibited one. If the claim is a disease claim, no disclaimer makes it compliant.

How do I rewrite a disease claim into a compliant one?

Shift from the condition to the normal function. Instead of relieves joint pain, which implies treating a condition, say supports joint comfort and flexibility, which describes normal function. Instead of lowers blood sugar, say supports healthy blood sugar already in the normal range. You keep the benefit's spirit while staying on the structure-function side of the line.

Playbook Compliance-safe marketing

Structure-function vs disease claims: the line that keeps you live

One distinction separates a claim you can make from one that gets your listing pulled: structure-function versus disease. Here is exactly where the line sits, with examples, and how to rewrite a claim that crosses it.

January 11, 2026 7 min read

There is a single line in health and supplement marketing that decides whether your claim is allowed or gets your listing pulled, and most violations come from not seeing exactly where it sits. On one side is a structure function claim, which describes how an ingredient affects normal body function and is permitted with a disclaimer. On the other is a disease claim, which says or implies the product treats a condition and is prohibited outright. Here is exactly where the line runs, with examples, and how to rewrite a claim that crosses it.

The structure function claim and its opposite, plainly

A structure function claim describes an effect on the normal structure or function of the body, without naming or implying a disease. “Supports immune health.” “Helps maintain healthy energy.” “Promotes joint comfort.” These are permitted on a supplement, with the FDA disclaimer.

A disease claim says or implies the product diagnoses, treats, cures, mitigates, or prevents a disease. “Treats anxiety.” “Lowers cholesterol.” “Prevents the flu.” “Relieves arthritis.” These are prohibited on anything not approved as a drug, and no disclaimer changes that.

The disclaimer permits a structure-function claim. It does not rescue a disease claim. That is the whole rule.

The line, in examples

The fastest way to internalize the structure function vs disease claim split is to see these supplement claim examples as matched pairs: the same benefit, said two ways.

“Lowers blood sugar” is a disease claim. “Supports healthy blood sugar already in the normal range” is structure-function.
“Relieves joint pain” implies treating a condition. “Supports joint comfort and flexibility” describes normal function.
“Boosts immunity to fight colds” names a disease. “Supports a healthy immune system” does not.
“Helps you sleep through insomnia” references a disorder. “Promotes restful sleep” describes function.

The pattern is always the same: move from the condition to the function. Name the normal thing the body does, not the illness you are implying you fix.

Watch the implied claims

The obvious disease claims are easy to avoid under the FDA claim rules. The ones that get sellers pulled are implied: a structure-function sentence sitting next to an image of a glucose meter, a testimonial that mentions a diagnosis, a product name that references a condition. The implication is the claim. If a reasonable shopper would read the whole listing, words and images, as treating a disease, it is a disease claim no matter how carefully the bullet was worded.

Build the check into publishing

A claim review that keeps you live

Every claim describes normal function, not a disease
The FDA disclaimer accompanies each structure-function claim
No disease names, conditions, or drug terms anywhere, including images
Implied claims checked: image plus text read together
Reviews and Q&A not seeding a disease claim you endorse
Back-end search terms free of condition keywords

This is the same describe-do-not-claim discipline behind the guides to marketing unregistered products and supplement compliance on Amazon; this playbook is the single line those guides turn on, isolated so you can train a team on it in ten minutes. It is the core of compliance-safe marketing: say the benefit on the permitted side of one clear line, every time.

If you are in a regulated category and want this review built into how every listing ships, so a disease claim never goes live in the first place, that is exactly the kind of system a Growth Audit puts in place.