What A "Structure-Function" Claim Actually Means

What the FDA actually allows

A dietary supplement label can describe an effect on the body's structure or function — how a system works, in general — without pre-approval, as long as the claim is truthful, isn't about treating a disease, and carries the standard FDA disclaimer. "Supports healthy digestion" and "boosts fat metabolism" are textbook examples of this category.

What it doesn't allow

A claim that a product treats, cures, or prevents a specific disease crosses into drug-claim territory, which requires an entirely different, much more rigorous approval process. That's why you'll never see a legitimate supplement label say it "treats obesity" or "cures a metabolic disorder" — only softer, structure-function language.

Where marketing sometimes drifts

The label itself usually stays inside those careful lines. Sales pages and checkout copy, written by marketing teams rather than regulatory reviewers, sometimes use punchier language that implies more than the label claims — phrases like "melts fat" or "transforms your body overnight." That gap is worth noticing, because the label is the more conservative, more legally accountable version of what a product actually claims.

How to use this when comparing products

• Read the product's actual printed label claims first, separately from the sales page.
• Treat stronger marketing language as aspirational copy, not a promise the label itself is making.
• If a claim sounds like it's describing a cure or a dramatic transformation, that's worth extra skepticism regardless of which page it appears on.