Health claims in US advertising: the evidence you have to hold

Advertising law in the United States expects an advertiser to be able to prove an objective claim before it is made, rather than after a complaint arrives. For health claims, the accepted measure is competent and reliable scientific evidence: research conducted and evaluated by qualified people, using procedures generally accepted in the field.

The standard is about the quality of the support rather than the volume of it. A collection of small studies that measure something adjacent to the claim supports very little. One well designed study that measures the exact outcome, in the population the advertising addresses, supports considerably more.

A claim about feeling well or maintaining normal function asks for less than a claim about treating a condition or achieving a specific measurable result. As the promise becomes more specific, the expectation moves toward controlled human studies, and a claim that resembles a treatment claim attracts the closest scrutiny of all.

A practical test is whether the studies were designed to answer the question the advertising poses. Where they answer a neighbouring question, the gap between the two is exactly what a regulator or a competitor will describe in a complaint.

The Health Products Compliance Guidance replaced an older guide that had been written with dietary supplements as its frame. The current document speaks to foods, over the counter drugs, devices, health related services and supplements, which makes it the reference for a clinic or a wellness brand rather than for one product category alone.

For a service business the useful part is the framing. The guidance treats the claim, the evidence and the consumer's takeaway as one chain, so a practice cannot support a strong promise with evidence gathered for a softer one, and cannot rely on the strength of a study it never put in front of the buyer.

The Commission reads an advertisement as a buyer does, which means the images, the testimonials and the layout are part of the claim. A dramatic before and after photograph beside a modest written claim creates a larger promise than the words alone, and the evidence has to cover the promise the buyer actually receives.

Disclaimers have a narrow role. They can clarify a claim that is otherwise supported, and they cannot convert an unsupported claim into a supported one. A qualifier that contradicts the headline, or that a buyer would read past, tends to be treated as decoration rather than as a limit on the claim.

The file worth keeping is short and specific: the published claim, the studies relied on, the population and protocol in each study, and a written explanation of why those studies support that claim. Where evidence is thin, the honest move is to narrow the claim rather than to add a disclaimer to a promise the evidence cannot carry.

That narrowing is usually a brand decision before it is a legal one. A practice that claims less can say it more plainly, and a plainly supported claim tends to be the more persuasive one anyway.