The State of Supplement Claims · Category report
We ruled the 353 best-selling sports nutrition listings on Amazon US, from 162 brands, against all 109 published standards. 68% fail, level with energy for the lowest rate of the eight categories, and 17 listings pass clean. But the Critical claims in sports are the most serious in the database: a prescription drug named or implied as an equivalent at 15 brands, “legal steroids” or an anabolic effect at 11, and “no side effects” at 18. 51 of the 162 brands carry a Critical claim, the class that can get a listing suppressed, on listings that were selling when we read them.
Method · every phrase ruled against FDA structure/function, FTC substantiation and marketplace policy · 109 standards, v1.4.1 · scanned 14-27 Sep 2026 · brands never named in public data · free to cite with attribution
Executive summary
Two in three sports listings fail, level with energy for the best rate of the eight.
241 of the 353 listings received a FAIL verdict, 68% against 76% across all eight categories, and 17 listings, 5%, pass with nothing to fix. These are the bestsellers: protein, creatine, pre-workouts and the testosterone and muscle formulas beside them.
Its Critical claims are the most dangerous in the database.
31% of sports brands carry a Critical finding, below the 42% average. What sets the category apart is which ones: a prescription drug named or implied as an equivalent at 15 brands, “legal steroids” or an anabolic effect at 11, and “treats erectile dysfunction” at 3. These are the claims behind the FDA’s warning letters to sports brands and Amazon’s named prohibitions.
The High findings are proof claims.
“Scientifically proven” or “doctor proven” at 25 brands, “clinically proven” at 20, “guaranteed results” at 20, and “balances hormones” at 26, a claim that describes correcting a disordered state.
Sports copy is written to sound like the locker room: like the real thing, legal, proven, guaranteed. The regulator reads “like the real thing” as a drug claim, and it is the one it acts on first.
Method and data
Listings enter the database through the same engine that runs our paid audits. Each listing is ruled, phrase by phrase, against all 109 standards in force at the scan, built on FDA structure/function rules, FTC substantiation guidance and Amazon’s supplement claims policy. Every finding must quote the page word for word, and any quote the software cannot find on the page is discarded before it enters published figures. Since 28 Sep 2026 the category also holds every ruled listing from Amazon’s own Best Sellers lists for it. Paid audit verdicts are signed by a licensed pharmacist. Individual brands are never named in public data. The full method and the standards behind it are documented on the Standards page.
The whole-database figures this report is drawn against are in The State of Supplement Claims; the category’s screenshot-ready numbers are on its scorecard.
The verdict split
A FAIL verdict means the listing carries at least one Critical or High finding, a phrase that breaks a published standard seriously enough that the listing as a whole does not pass. FIX THEN PASS means the only findings were Medium or Low. PASS means no findings at all.
Every ruled sports listing by verdict · 353 listings
17 of 353 listings pass with nothing to fix. A FAIL verdict does not mean the product is unsafe or ineffective; this report measures marketing language, not chemistry. But marketing language is what regulators, platforms and courts read, and by that measure 68% of the category’s bestsellers do not hold up.
Percentages rounded to the nearest point. Counts are exact.
Fail rate by category
Sports is last on fail rate, which is the best position, and near the average on the share of brands carrying a Critical finding. The two measures answer different questions, and sports shows the gap: fewer listings with something serious to fix, but the most serious kind where there is.
The right-hand column is the share of that category’s brands carrying at least one Critical finding. Rows count every listing ruled in that category; a listing sold into two categories is ruled in each.
Fail means at least one Critical or High finding on the live listing.
The phrase table
Ranked by how many of the 162 brands carry each one. Struck phrases are quoted from live listings. The brands are not named. Their copy names them.
Counts are distinct brands, among the 162 ruled in the category, that carry the phrase or a direct variant. Bars are scaled to the top row.
Six of the ten are the paperwork and default-vocabulary failures found across the whole database. The sports-specific rows are proof and correction: “scientifically proven” or “doctor proven” (25 brands), “clinically proven” (20), “guaranteed results” (20) and “balances hormones” (26). The Critical claims sit outside the top ten because fewer brands make them, and they are the ones that matter most.
The claims that can end a listing
Every Critical finding in the category, grouped by the rule it breaks and counted by brand. Sports’ Critical claims lead with a disease or drug term Amazon’s policy bars by name.
Counts are distinct brands with at least one Critical finding of that class. A brand can appear in more than one row.
Inside the findings
Across the 353 listings we logged 1,760 findings. 119 are Critical, 7% of the category’s findings against 9% across the database, with 462 High findings behind them.
Every finding logged in the category, by severity · 1,760 findings
The dated record
The numbers above would matter less if enforcement were theoretical. It is not, and drug-equivalence and steroid claims are the FDA’s most frequent target in sports nutrition.
Four institutions with four different incentives read supplement listings the same way, and the platforms read with machines that keep getting better: Amazon’s AI scans billions of listing changes a day, and Google’s Gemini models read what an ad means. A sports listing that says “legal steroids” is not hiding from any of them.
Sources: FTC penalty schedule and Notice of Penalty Offenses, FDA warning-letter database, Amazon seller policy, public litigation record.
Guidance
This is general information, not legal advice. The data does suggest a clear order of operations.
Never name the drug, and never say steroid.
A prescription name or an equivalence claim (15 brands) and “legal steroids” or an anabolic effect (11) are the two claims with the longest enforcement record in this category. There is no compliant version of either sentence.
Retire “balances hormones”.
At 26 brands. “Balance” implies correcting a disordered state. “Supports healthy testosterone levels already within the normal range” is the strongest wording the rules allow.
Prove it or drop it.
“Scientifically proven” (25 brands), “clinically proven” (20) and “guaranteed results” (20) need the study on the page or they are unsubstantiated as written.
Never promise safety.
“No side effects” and “100% safe” are Critical at 18 brands. Delete the sentence.
Fix the paperwork.
The FDA disclaimer is missing at 72 brands, a Non-GMO claim has no document behind it at 73, and “GMP certified” cannot be verified from the listing at 64.
Pharmacist-in-the-loop
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Cite this report
Claims Verified, The State of Supplement Claims: Sports, Q3 2026
Free to reproduce with attribution. Every figure on this page is recomputed from the database before each release; the method and the standards are published and versioned.
audit@claimsverified.org →Media and methodology questions: audit@claimsverified.org · © 2026 Claims Verified · Data from the claims database, snapshot 27 Sep 2026 · Reproduction with attribution permitted · Cite as “Claims Verified, The State of Supplement Claims: Sports, Q3 2026” · Not legal advice
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