Dietary supplements are sold under a law that trusts manufacturers to police themselves. Independent testing shows, over and over, that many don't. Below: the eight deceptive practices that keep showing up, and the lab results that prove them.
The Dietary Supplement Health and Education Act flipped the burden of proof. Before it, a company had to show a product was safe. After it, the FDA has to prove a product is unsafe — and only after it's already on shelves.
Supplement makers write their own labels, choose their own "standards," and self-certify compliance. No agency verifies the dose, the purity, or the ingredient form before sale.
"Third-party tested" may mean one batch was checked for bacteria — not heavy metals, not whether the dose is right. "Clinically studied" often refers to the raw ingredient in general, not the product in your hand. "Lab verified" has no definition at all.
These aren't isolated incidents. Each pattern below has been documented across multiple brands, multiple years, and multiple independent labs.
The label promises a dose. The product delivers a fraction of it — sometimes close to nothing. This is the single most common failure in supplement testing, and it's a textbook false-advertising claim: the number on the front is simply untrue.
The opposite problem, and in some categories the more dangerous one. Products that deliver two or three times the label dose — especially sleep aids and children's products — expose consumers to amounts they never agreed to take.
Lead, cadmium, arsenic, and mercury — present in the product, absent from the label. There is no enforceable federal lead limit for supplements, so companies rarely test for it and never disclose it. Plant-based products are the worst offenders because the plants absorb metals from soil.
The label names a premium form of an ingredient; the bottle contains a cheaper one. The total amount may even check out — but the form the customer paid for isn't there. This is deception by chemistry.
Legal-looking numbers that mean something other than what a reasonable buyer assumes. Listing the weight of a compound instead of the active element. Burying a yield percentage in parentheses. Claiming the raw-material weight rather than what's in the capsule.
The active ingredient was there when the product was made, then broke down into something inert before it reached you. Companies that choose formats their ingredient can't survive in — gummies, liquids — and still print the full dose are making a claim they know won't hold up.
Substances in the product that aren't on the label at all — sometimes replacing the advertised ingredient, sometimes added alongside it. For some of these, sale as a supplement isn't even legal.
Even when the ingredient is present in the right amount, a tablet that doesn't break apart in the body delivers nothing. Disintegration testing is standard for pharmaceuticals and routinely skipped for supplements.
Buys products at retail; tests for content, contaminants, and dissolution. Two decades of category reviews.
Nonprofit. Its October 2025 protein investigation is the most-cited recent heavy-metal finding.
JAMA and JAMA Internal Medicine have published label-accuracy studies on melatonin and vitamin D.
Industry and platform testing of Amazon-sold brands using HPLC and ISO-accredited labs.
"Pure," "tested," "5 g per serving." Heavy influencer spend. None of these words are regulated.
On a doctor's, trainer's, or influencer's recommendation, relying on the label.
Underdosed, contaminated, substituted. Usually years into the product's sales run.
"Our products meet all applicable regulations" — true, because the regulations are minimal. Refunds are rare.
Consumer-fraud claims under New York law are one of the few mechanisms that attach a real cost to a false label.
New York law gives consumers tools to respond when companies deceive them. Understanding those tools costs nothing.