Supplement Advertising and FTC Substantiation
The FTC governs supplement advertising: competent and reliable scientific evidence, testimonial limits, and the affiliate's place in the chain of liability.
DSHEA and the FDA govern what a supplement label may say. The Federal Trade Commission governs what supplement advertising may say — and advertising is where affiliates live. The two regimes operate together, and the FTC’s 2022 Health Products Compliance Guidance is the controlling document for advertising claims.
The substantiation standard
Any objective health claim in advertising must be supported, before it is made, by competent and reliable scientific evidence. For health-benefit claims, the FTC generally expects randomized, controlled human clinical trials, and it stresses that quality matters more than quantity — a stack of weak studies does not substantiate a claim, and results should be consistent with the broader body of evidence.
Testimonials and results
- A testimonial cannot be used to make a claim that could not be substantiated if the advertiser made it directly.
- Dramatic before/after or “results” claims must disclose what typical users can realistically expect — a bare “results not typical” is not enough.
- Vague qualifiers such as “may help” or “promising” do not rescue an unsupported claim.
Affiliates are in the chain of liability
The FTC states that all parties who participate in marketing and promotion, or who control those practices, must ensure claims are truthful. An affiliate who repeats an unsubstantiated supplement claim adopts it and can be held responsible.
FDA vs. FTC, side by side
| FDA (DSHEA) | FTC | |
|---|---|---|
| Governs | Labeling, manufacturing, claim notifications | Advertising and promotion (incl. affiliate content) |
| Standard | Truthful, not misleading; disease claims barred | Competent and reliable scientific evidence |
| Disclaimer | Requires the DSHEA structure/function disclaimer | Requires clear and conspicuous disclosures |
Practical guidance for affiliates
Keep your claims within accurate structure/function language, hold or rely on genuine substantiation, avoid disease claims and unrealistic results, and pair the DSHEA disclaimer with your affiliate disclosure. When you are unsure whether a claim is supported, do not make it.
Authoritative sources
Last reviewed July 2026. This page is general educational information, not legal or tax advice.