FTC Affiliate Disclosure: A Practical Guide for Health and Research Publishers

If you earn a commission when a reader buys, United States law requires you to say so, in a way the reader actually sees, before they act. That is the whole principle behind the FTC Endorsement Guides, and most affiliate disclosure failures are not sophisticated: they are a disclosure buried in a footer, hidden behind a "more" link, or written in a shorthand nobody outside marketing understands. This guide covers what the rules require, where the disclosure has to sit on each platform, and the additional discipline that applies when the materials you promote are sold for research use only.

Sparta Labs materials are supplied for laboratory and research use only.

This article is general information, not legal advice. The FTC's guidance is principles-based and applies to specific facts, and enforcement, platform policies, and state law all change. Consult qualified counsel about your own situation before relying on anything here.

What the FTC Endorsement Guides actually require

The core requirement is disclosure of a material connection: any relationship between you and the seller that a reader would not reasonably expect and that might affect how much weight they give your recommendation. An affiliate commission is a textbook material connection. So is free product, payment, a discount code you profit from, an employment relationship, or a family tie to the company.

Two points people get wrong:

The size of the payment is irrelevant. A 3% commission needs disclosing exactly as much as a 30% one. There is no de minimis exception.

Your honesty is irrelevant to the requirement. Even if your review is scrupulously fair and you would have recommended the product anyway, the connection still has to be disclosed. The rule is about the reader's ability to evaluate your recommendation, not about your intent.

Liability also runs in both directions. Advertisers can be held responsible for what their affiliates publish, which is exactly why serious programs review applications, supply approved phrasings, and terminate affiliates who make claims the brand cannot support.

What "clear and conspicuous" means in practice

The Guides do not prescribe magic words. They set a standard: the disclosure must be unavoidable. Working definitions that hold up:

Placement close to the claim. The disclosure belongs near the recommendation and the link it applies to, not in a distant section of the page. A reader who sees your link should already have seen the disclosure.

Above the fold, before the first affiliate link. If a reader can click your link without having scrolled past the disclosure, the disclosure is too low. A footer disclosure, or one at the bottom of a 3,000 word article, does not satisfy the standard for a link that appears in paragraph two.

Not hidden behind an interaction. Disclosures collapsed behind "more," "see more," a tooltip, a hover state, an accordion, or a separate terms page are not conspicuous. If the reader has to take an action to see it, assume it does not count.

In the same medium as the claim. A video endorsement needs a disclosure the viewer can perceive in the video, not only in text below it. An audio-only format needs an audible disclosure.

In plain language, unambiguous. Say "I earn a commission." Do not rely on "sp," "aff," "collab," "ambassador," "thanks to @brand," or a bare "#partner" tucked into a wall of hashtags. Terminology your audience has to decode is not clear.

Legible and durable. Adequate contrast, adequate size, on screen long enough to read at a normal pace. White eight point text on a light background is a disclosure in name only.

Repeated where needed. On a long page with links throughout, or a livestream people join at different times, one disclosure at the start is not enough for everyone. Repeat it.

Platform-specific placement

Blog posts and long-form articles

Put a one or two sentence disclosure at the top of the post, before the first affiliate link and visible without scrolling on a phone. A sitewide footer or affiliate-disclosure page is a supplement, never the primary disclosure. If your links appear in a comparison table halfway down, add a short line there too.

YouTube and long-form video

Disclose three ways: say it aloud in the first seconds, put it on screen as a superimposed text overlay long enough to read, and put it in the first line of the description above the "show more" cut. The description alone is not sufficient, because most viewers never expand it.

Short-form video (TikTok, Reels, Shorts)

The disclosure has to be perceivable in the video itself: spoken, or on screen as a caption that is not obscured by platform UI, and present long enough to read at short-form pace. Platform "paid partnership" toggles are useful but the FTC has not treated them as sufficient on their own. Do not rely on a caption a viewer has to tap to expand.

Instagram, X, and short text posts

Put the disclosure at the front of the caption or post text, not at the end of a hashtag block and not below a truncation point. In Stories, superimpose it on every frame that carries the link or claim.

Podcasts and audio

Read it aloud, close to the endorsement. Show notes alone do not reach the listener in the medium they are consuming.

Email and newsletters

Disclose near the top, above the first affiliate link, in the body of the email. A line in the email footer sits after the links it is meant to qualify.

Livestreams

Disclose at the start and repeat it periodically, because viewers arrive throughout. Pin it in the chat or keep it in a persistent on-screen element.

Disclosure wording that holds up

Short, plain, unambiguous. Examples of the register to aim for:

• "I earn a commission on purchases made through links in this post."
• "Affiliate disclosure: some links below are affiliate links. If you buy through them, I get paid a percentage of the order at no extra cost to you."
• Spoken, for video or audio: "Heads up, the links in the description are affiliate links and I earn a commission if you use them."

Wording to avoid: "sp," "aff," "collab," "ambassador," "thanks @brand," "#partner" alone inside a hashtag wall, or anything that requires knowing marketing jargon.

The extra layer for research-use-only materials

Disclosure is table stakes. When the materials are supplied for laboratory and research use only, a second and stricter layer applies to the substance of what you publish, and this is where affiliates in this category most often create problems for themselves and for the supplier.

No health outcome claims. Do not state or imply that a compound produces any effect in a person, whether therapeutic, cosmetic, performance, or metabolic. This includes hedged framing ("may support," "some people report"), implication by juxtaposition, and outcome language in a title, thumbnail, or alt text.

No dosing, protocols, or administration guidance. Not amounts, not schedules, not routes, not reconstitution instructions framed for personal use, not "what people typically run."

No human-use framing. Do not write in the second person about using the material, describe personal experience with it, or present it as something a reader would take. Research materials are described as laboratory inputs, not as things people consume.

No testimonials, reviews of effects, or before-and-after content. A testimonial about a research material is a human-use claim by construction, and it carries its own FTC exposure on top of the underlying problem.

No implied professional endorsement. Do not present a clinician, coach, or scientist as vouching for use in people.

Do not repurpose consumer supplement copy. Claim latitude that exists for a dietary supplement does not transfer here. Rewriting a supplement page and swapping the product name is the fastest route to non-compliant content.

What is left is a genuinely substantive story: sourcing and supply chain, third-party HPLC testing and per-batch certificates of analysis, cold-chain handling and United States shipping, catalog availability, and program mechanics such as commission structure and payout terms. Those are factual, verifiable, and safe to write about.

Common mistakes worth auditing your own site for

1. A disclosure only in the site footer or on a separate policy page.
2. A disclosure at the bottom of the article, below every link it qualifies.
3. Reliance on a platform's paid-partnership label with nothing in the content itself.
4. Hashtag-only disclosure, positioned after a caption truncation point.
5. Text on screen for under a second, or at a size unreadable on a phone.
6. Disclosure on the landing page but not on the social post that drives to it.
7. Old posts that predate joining the program and were retrofitted with affiliate links but never with a disclosure.
8. Research-use materials described in second-person, outcome-oriented language.

An annual sweep of your archive catches most of these. Keep dated screenshots of your disclosures and a record of which posts carry affiliate links; documentation is what makes a good-faith compliance posture demonstrable rather than asserted.

How Sparta Labs handles this with affiliates

Applications are reviewed manually rather than auto-approved, because a program that approves anyone inherits whatever its affiliates publish. Approved affiliates receive pre-approved phrasings for describing the catalog and ready-to-paste FTC disclosures, so nobody has to guess at wording or invent research-use-only framing from scratch. The binding rules are in the affiliate program agreement.

If you publish for an audience that sources laboratory materials and you are willing to work inside these constraints, you can apply to the Sparta Labs affiliate program.

Again: this is general information, not legal advice. Have counsel review your disclosures and your content standards against your actual publishing practice.

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Sparta Labs products are supplied for laboratory and research use only. They are not intended for human or veterinary use, diagnostic use, or as food or drugs.