To prove a supplement label claim is false, you must show the statement is actually false and likely to affect a purchase. That usually takes lab testing of your lot, human clinical evidence, and expert agreement that the claim is wrong. A dietary supplement is a vitamin, mineral, herb, or similar product taken by mouth. A label is misbranded under federal law when it is false or misleading in any particular.
Official resources:
- Read the official guidance from FTC — Use this primary source to verify the official guidance.
- Read the official guidance from FDA — Use this primary source to verify the official guidance.
Table of Contents
- What counts as a false label?
- What type of claim is on your bottle?
- What proof do courts expect?
- How do you build a usable file?
What counts as a false label?
The U.S. Food and Drug Administration says it does not approve supplements or their labels before sale, so the maker and seller must ensure safety and truthful labeling, as explained in the FDA consumer guide on dietary supplements. That responsibility matters for lawsuits because there is no preapproval to rely on. Keep the exact label and ad that sold you the product. A food, including a supplement, is misbranded when its labeling is false or misleading in any particular, according to Justia's text of the federal misbranding statute.
Small wording differences can still mislead. Compare what the front label promises with what the back label and facts show. The Federal Trade Commission calls a claim deceptive when a reasonable consumer would likely be misled and the point would likely affect a purchase. Focus on material promises like potency, ingredients, or health benefit. Puffery alone rarely supports a claim.
What type of claim is on your bottle?
A structure/function claim describes how a nutrient affects the body, such as calcium helps build bones. A maker using that type of claim must have support that it is truthful and not misleading, print the DSHEA disclaimer, and notify FDA with the claim text within 30 days of first marketing. Missing disclaimers or notice can support an enforcement issue, but your lawsuit still turns on falsity. A disease claim says a product can diagnose, treat, cure, mitigate, or prevent disease. The National Center for Complementary and Integrative Health warns that supplement labels may not make disease claims because only approved drugs may do so.
A cold cure or diabetes treatment promise on a supplement is a red flag. Save a photo of that language. Identity, potency, and purity claims are often the easiest to test. Does the bottle say 500 mg, extra strength, or free of contaminants? Those statements can be checked by a lab. Health-outcome promises need stronger science.
What proof do courts expect?
The Federal Trade Commission requires health-benefit claims to have competent and reliable scientific evidence, which generally means human randomized, controlled testing strong enough to satisfy experts, as described in the FTC health-products guidance. For your case, gather those human trials, not animal studies or testimonials. One weak study rarely outweighs consistent negative results. Courts demand proof of actual falsity, not only weak support.
Buyers alleging false advertising must plead and prove the label is actually false. The Fourth Circuit affirmed dismissal of glucosamine and chondroitin claims without an allegation that all reasonable experts agree the claims are false, as reported by Kelley Drye & Warren. That limit shapes who can win and who cannot. A claim that science has proven wrong supports a case. A claim that science has not yet studied often does not, even if the company's proof looks thin.
How do you build a usable file?
Start with what you bought and saw. The NIH Office of Dietary Supplements advises buyers to keep the bottle, label, ads, and receipt, test the same product or lot in an accredited lab for identity, potency, and purity, and compare the claim against trials and expert consensus.
Lot numbers matter because formulas change. Use this checklist before you contact a lawyer or file a claim: Do not throw away the bottle after you finish it. Store it with the receipt where heat and light will not degrade it.
- Keep the sealed or used bottle, box, label photos, ads, screenshots, and receipt
- Write down dose, dates used, store, price, and why you bought it
- Send an unopened bottle from the same lot to an accredited independent lab
- Ask for identity, potency, and purity testing tied to the label promise
- Pull human randomized trials and reviews that directly address the claimed effect