Evidence Watch
Structure And Function Claims And The Disclaimer On The Box
The carefully worded claims on supplement packaging follow a specific legal boundary, and learning to read that boundary reveals what a product is permitted to say.

Supplement packaging says things like supports healthy digestion rather than treats indigestion. The wording is not vagueness. It follows a legal boundary, and reading it reveals what the product is permitted to claim.
The two categories of claim
American law distinguishes a disease claim, which asserts that a product treats, prevents or cures a named condition, from a structure or function claim about the body's normal workings.
Disease claims turn a product into a drug for regulatory purposes, which would require approval before sale and evidence submitted for review.
Structure and function claims may be made without that review, provided the manufacturer holds substantiation and notifies the agency after marketing begins.
How the wording gives it away
Verbs like supports, promotes, maintains and helps keep signal a structure or function claim, while treats, cures, relieves and prevents cross into disease territory.
The object of the sentence matters too. Supporting healthy joints is permitted, while addressing arthritis names a disease and is not.
Once the pattern is visible on one box it is visible on all of them, because the entire category is written to the same boundary.
The disclaimer and what it means
Any structure or function claim must be accompanied by a statement that the claim has not been evaluated by the agency and that the product is not intended to diagnose, treat, cure or prevent disease.
The disclaimer is a legal requirement rather than a caution written by the manufacturer, which is why its wording is identical across otherwise unrelated products.
It also means the front of the package and the disclaimer are saying different things, and the disclaimer is the more reliable of the two.
What substantiation actually requires
Manufacturers must have evidence that a claim is truthful and not misleading, but that evidence is not submitted for approval and is not published.
The standard is competent and reliable scientific evidence, which is interpreted flexibly and may rest on studies of an ingredient rather than of the finished product.
Enforcement is retrospective, and action generally follows complaints, marketing that crosses into disease claims, or documented harm.
Where this leaves a reader
A claim on a package tells you what the manufacturer is legally permitted to say, which is a different thing from what the product has been shown to do.
Traditional-use language occupies a similar position, describing a history of use without asserting an effect, and it is not evidence of benefit.
Where a product is being considered for a diagnosed condition, that decision belongs with a physician, since a disease claim is precisely what the label cannot make.
Also by Sanjay Iyer
- The placebo question, taken seriouslyEvidence Watch
- Diuretic herbs and the kidneyHerbs & Formulations
- Yoga injuries and how to practise without acquiring oneYoga & Breath
- Arjuna and the heart claimsHerbs & Formulations





