Supplement review sites and affiliate bias: how to judge one

Partly, yes, and you should assume it until a site shows you otherwise. Most supplement review sites earn money when you click through and buy, and that gives them a reason, even an unintended one, to make offers look good. This does not make every review dishonest. It means you should judge a review site the way you would judge a salesperson: by what it discloses, what it publishes when a product looks bad, and whether you can check its work.

We are in that position too. DoseAudit links to offers through ClickBank and Digistore24, and we may earn a commission when you buy. This article explains how that kind of bias works, what the FTC says about it, and what you should look for on our site and any other.

How do affiliate commissions bias supplement reviews?

The mechanism is simple. If a site is paid only when a reader buys, then a positive review can earn money and a negative one usually earns nothing. Nobody has to write a false sentence for this to shape a site. It can shape which products get reviewed, which get a prominent button, which get the "best of" list and how much the headline promises.

Bias also shows up in quieter ways:

• Selection. Products that pay a good commission get covered, and the ones that would look bad are quietly skipped.
• Framing. A weak result is described as "promising", and a hidden dose is described as "a proprietary approach".
• Rankings. A "top 10" list is ordered by payout, not by the strength of the evidence.
• Silence. The review never mentions the refund window, the auto-ship box or the missing supplement facts, because those would reduce sales.

The FTC describes the wider problem plainly. On its page about endorsements, influencers and reviews, it says that some businesses abuse the trust people place in reviews by writing or procuring fake reviews or by paying supposedly independent websites for good rankings.

What does the FTC say about affiliate links and disclosure?

The FTC's answers on its Endorsement Guides speak directly to affiliate marketing. If you have links to a retailer and earn a commission when people buy, the FTC says you should disclose that relationship clearly and conspicuously so readers can decide how much weight to give your endorsement. It suggests wording along the lines of "I get commissions for purchases made through links in this post". It also says the closer the disclosure is to the recommendation, the better.

The wording matters, according to the same page. "Affiliate link" alone may not be understood, because consumers might not realize it means the person placing the link is paid for purchases, and a "buy now" button would not be adequate either. "Paid link" right next to an affiliate link should be adequate, while "commissionable link" is probably not a clear disclosure.

There is also a limit on how far editorial content can be shaped by money. In an example about a restaurant review site, the FTC says that if the purchase of a display ad positively impacts the editorial content of a review, the review could be deceptive. Money is allowed. Money changing the verdict is the problem.

Can a site pretend to be independent when it is not?

Not lawfully, if the site is controlled by the company whose products it reviews. The FTC's rule on consumer reviews and testimonials prohibits a business from misrepresenting that a website or entity it controls provides independent reviews or opinions about a category of products that includes its own. In its Q&A, the FTC says that a company that runs a review and ranking website for its own products and competing ones would violate the rule with an express claim of independence, and that a disclosure of ownership cannot undo a false express claim.

That is a rule about ownership and misrepresentation. It does not make affiliate sites illegal, and a site that earns commissions is not "company-controlled" just because it is paid. But it tells you what to look for: who owns the site, and whether it claims a neutrality it does not have.

What should a trustworthy review site show you?

Use this checklist on any review site, including ours:

1. A disclosure near the link. Not buried in a footer. Look for plain wording that says the site may earn a commission.
2. A stated method. The site should explain what it checks and how it scores, so you could repeat the check.
3. Negative verdicts. If nearly every product is recommended, the site is selling, not reviewing. Look for low scores that stay online.
4. Specifics you can verify. Doses compared with studies, real prices from the order form, refund terms and dates, not adjectives.
5. Sources you can open. Links to PubMed, NIH or FDA pages, not only to other blogs.
6. Honesty about what it did not do. A site that claims it tested every product on itself in every category is asking for trust it cannot earn.
7. A named owner and contact. If nobody stands behind the site, there is nobody to hold to the standard.

How does DoseAudit handle this?

We will describe our own setup plainly, and you can check it against the checklist. Many links to products on DoseAudit are affiliate links through the ClickBank and Digistore24 marketplaces, and if you click and buy, we may earn a commission. You pay the same price as you would going to the seller directly. Our affiliate disclosure says this, and the buttons that lead to an offer are labeled and carry the sponsored link attribute.

Our review method says a commission never changes a score. It also says we audit the offer, meaning the label, the sales page, the order form and the refund terms, and that we do not use the products. We publish what we find, and the numbers give you something to test the claim against. In the catalogue when we wrote this, of 518 reviews, 170 were rated "Doesn't add up", 345 "Worth a look" and only 3 "Holds up". A site that only wanted clicks would not publish that distribution. You can see the lowest-scored offers, such as the Trauma Root Recovery Program review and the Teslacare review, published with their reasons even though those links are also affiliate links.

That said, a promise of independence is still a claim. We cannot prove our own motives, and no site can. So do not rely on our word. Check the method, read the reasons behind a score, and open the sources we list. If a review's reasoning does not hold up, that is a reason to trust us less, and you should tell us.

What can I do beyond reading a review site?

Go to primary sources for the facts that matter. The FDA advises consumers to be informed and to talk to a doctor, pharmacist or other healthcare professional before deciding to purchase or use a dietary supplement. The NIH's National Center for Complementary and Integrative Health runs a "Know the Science" project with guides on judging health news, scientific articles and online resources. Both are useful checks on any commercial site, ours included.

Also compare two or three reviews of the same product. If they disagree, look at why. One may have opened the order form and the other may have copied the sales page. Then look at the price, the refund terms and the label for yourself. Our guides to refunds through ClickBank and refunds through Digistore24 show what to do if you buy and the product is not what the page promised, and you can browse all reviews to see how the scores look across categories.

FAQ

Are supplement review sites with affiliate links trustworthy?

Some are, but the commission is a reason to check. Look for a disclosure next to the link, a published scoring method, negative verdicts that stay online and sources you can open. Absence of those is a stronger warning than the affiliate link itself.

Is it legal for a review site to earn commissions?

Yes, but the FTC says the relationship should be disclosed clearly and conspicuously so readers can weigh the endorsement, and the disclosure should sit near the recommendation. Wording like "affiliate link" alone may not be understood.

How can I tell if a review site is really independent?

Check who owns it, whether it reviews products from that owner, and whether it claims independence. The FTC's rule prohibits a business from misrepresenting that a website it controls provides independent reviews of its own products.

Does DoseAudit earn money when I click?

We may earn a commission when you buy through a link to an offer, at no extra cost to you. Our method page says commissions never change a score, and the score distribution above is public. We did not buy or use the products, and we say so in every review.