Disease Claims vs. Structure/Function Claims: What You Can Actually Say on a Supplement Listing

Most supplement listings that get pulled for claims aren’t run by people trying to break the rules. They’re run by people who genuinely don’t know where the line is — because the line is genuinely subtle.

So let’s draw it clearly.

Two kinds of claims

A structure/function claim describes how an ingredient affects the normal structure or function of the body. These are generally allowed on supplements, as long as you can back them up and you include the standard disclaimer. The FDA’s own example is literally “calcium builds strong bones”.

A disease claim says or implies your product treats, cures, prevents, or diagnoses a disease. These are not allowed on a dietary supplement. The moment your copy crosses into disease territory, you’re making a drug claim — and Amazon (and the FDA) treat it that way.

The catch: the same ingredient can be described either way, and the wording is what decides which side of the line you land on.

The same ingredient, two very different sentences

Take something ordinary, like calcium:

• Allowed: “Supports bone health.” That’s structure/function — it describes a normal bodily function.
• Not allowed: “Prevents osteoporosis.” That names a disease. Now it’s a drug claim.

Or vitamin C:

• Allowed: “Supports a healthy immune system.”
• Not allowed: “Helps prevent colds and flu.”

See how thin the gap is? “Supports immune health” is fine. “Prevents the flu” is a deactivation waiting to happen. Same vitamin, completely different regulatory category — decided entirely by the verb.

The words that get you flagged

Some words are reliable trip-wires. If they show up in your title, bullets, description, A+ content, or even inside an image, expect trouble:

• treats, cures, prevents, heals
• names of conditions: diabetes, arthritis, anxiety, depression, hypertension, cancer
• “clinically proven to cure / treat…”
• before/after framing that implies treating a condition

Amazon’s automated systems scan images now, not just text. A graphic that says “fights inflammation” counts, even if your bullets are squeaky clean. This is the part sellers miss most — they sanitize the copy and forget the A+ content was designed by someone else.

The disclaimer isn’t optional

If you make structure/function claims, 21 CFR 101.93 requires this exact disclaimer on the label:

“This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.”

The same regulation is where the FDA spells out what counts as a disease claim — right down to “pictures, vignettes, symbols, or other means,” which is why an image alone can sink a listing. Leaving the disclaimer off doesn’t make your claims safer — it makes a legal claim look non-compliant. Include it.

A quick gut-check before you publish

Before any claim goes live, ask: am I describing a normal function, or am I naming a disease?

• “Supports healthy blood sugar already in the normal range” — function. Fine.
• “Lowers blood sugar for diabetics” — disease. Not fine.

If you can’t tell which one you wrote, rewrite it until you can. Vague-but-safe beats specific-but-suppressed every time.

Why this matters for compliance review

When Amazon flags a listing for claims, the fix is rarely “add a document.” It’s “rewrite the copy so it matches what the label can support.” That means going through the title, every bullet, the description, and — easy to forget — every image, and pulling anything that drifts toward disease language.

It’s tedious, and it’s the kind of thing that’s much easier to catch in someone else’s listing than your own. If your listing is down over claims and you’re not sure which line you crossed, a review will map every claim against your label and tell you exactly what to change before you resubmit.