Defending Lanham Act False Advertising Claims
¿Un competidor dice que su publicidad es falsa? El demandante debe probar falsedad, materialidad y daño.
A competitor has sued, or threatened to sue, over your advertising. The Lanham Act lets it challenge false or misleading claims, but it must prove the statement was advertising, false or misleading, material to buyers, and the cause of its losses. Each of those is a defense. Start with your response deadline, then the defenses below.
Bringing this claim instead?Lanham Act False Advertising Litigation →
- Calendar the deadline. Find the date you were served (or the date on the letter) and count the days: generally 21 in federal court, 20 in Florida state court.
- Preserve documents. Keep listings, ads, sales and sourcing records, emails, and messages. Do not delete posts or products; see Preservation Notices.
- Notify your insurer. Many business policies cover "personal and advertising injury." Give prompt written notice and send the complaint. Standard Coverage B includes publication that "disparages" another's goods, which may reach claims that your ads disparaged a competitor, but it usually excludes injury arising from your products' failure to conform to advertised quality or performance.
- Do not contact the plaintiff or its lawyers, and do not change your branding, listings, or website until you have advice.
- Capture every version of the ad. Save each version, with dates, channels, and languages, and pull the test data or studies behind each claim. Do not edit or remove ads before you have advice.
- Send us the papers. Upload the complaint or demand; we review it the same business day after a conflict check.
A false advertising case is a contest over evidence
A competitor says your advertising is false. Before arguing about whether it is, look at what the competitor has to prove.
Section 43(a)(1)(B) of the Lanham Act, 15 U.S.C. § 1125(a)(1)(B), reaches anyone who, "in commercial advertising or promotion, misrepresents the nature, characteristics, qualities, or geographic origin" of its own or another person's goods, services, or commercial activities. It is the federal statute a competitor uses to challenge performance claims, "clinically proven" claims, comparison charts, and "Made in USA" labels.
In Florida federal courts, the plaintiff must prove five elements, set out by the Eleventh Circuit in Johnson & Johnson Vision Care, Inc. v. 1-800 Contacts, Inc., 299 F.3d 1242 (11th Cir. 2002), and repeated in Hickson Corp. v. Northern Crossarm Co., 357 F.3d 1256 (11th Cir. 2004): the ad was false or misleading; it deceived, or had the capacity to deceive, consumers; the deception had a material effect on purchasing decisions; the product affects interstate commerce; and the plaintiff has been, or is likely to be, injured. It must also show the statement was "commercial advertising or promotion," and it must have standing under Lexmark.
That is a lot of proof, and each piece is a defense. Many claims are narrowed or defeated because the statement was true or supported, because it was puffery, because it never reached enough buyers to count as advertising, because it did not matter to purchasing decisions, or because the plaintiff cannot connect its losses to the ad. Where the plaintiff relies on a consumer survey, the survey itself is often the battleground.
Susan J. Latham handles our false advertising matters, for companies whose claims are challenged and for companies challenging a competitor's claims. The plaintiff's side is on Lanham Act False Advertising Litigation.
What usually decides these cases
- Your substantiation file: what support existed when the claim ran
- Whether the claim is literally false, or only arguably misleading
- Whether the plaintiff has a reliable survey of what buyers took away
- Whether the claim concerns something buyers care about
- Whether the plaintiff's lost sales trace to your ad or to something else
- Whether the plaintiff's own advertising can withstand the same scrutiny
What the plaintiff must prove, and where the defense attacks
This mirrors the elements table on our false advertising litigation page, from your side.
| What the plaintiff must prove | Where the defense attacks | What we gather |
|---|---|---|
| Standing (Lexmark, 2014) | No injury to a commercial interest in sales or reputation; harm too remote; the plaintiff is a consumer | Market structure, other competitors, the plaintiff's own sales trends |
| Commercial advertising or promotion | Not commercial speech; not aimed at influencing purchases; not disseminated widely enough to the relevant buyers | Who received the material, when, and why |
| False or misleading | The claim is true, substantiated, or puffery; it is ambiguous, so not literally false | Test protocols, raw data, studies, expert review |
| Deception | No reliable evidence of what consumers took away from a claim that is not literally false | Critique of the plaintiff's survey; a rebuttal survey |
| Materiality | The claim did not affect purchasing decisions; required even for literally false claims in the Eleventh Circuit | Purchase-driver research, sales data before and after the campaign |
| Injury and causation | Losses came from price, quality, distribution, or other competitors | Damages expert, market share data, customer testimony |
Six defenses to a Lanham Act false advertising claim
Most cases involve several of these at once. We build them in parallel from the first week.
The statement is true or substantiated
Truth is a complete answer. For an "establishment" claim, one that cites tests or studies ("clinically shown," "tests prove"), the question is whether the tests established the proposition for which they were cited and were reliable enough to support it (1-800 Contacts, 2002; Osmose, Inc. v. Viance, LLC (11th Cir. 2010)). Support that existed when the ad ran carries the most weight.
1-800 Contacts · OsmoseIt is puffery
"Bald assertions of superiority or general statements of opinion cannot form the basis of Lanham Act liability" (Osmose, quoting Pizza Hut). "The best coffee in Miami" is puffery; "twice the caffeine of Brand X" is not. Be careful with opinions that imply testable facts: Osmose noted that some safety statements can be actionable.
Osmose (11th Cir. 2010)It is not commercial advertising or promotion
In Suntree Technologies, Inc. v. Ecosense International, Inc. (11th Cir. 2012), the Eleventh Circuit adopted a four-part test: commercial speech, by a defendant in commercial competition with the plaintiff, for the purpose of influencing consumers to buy its goods, disseminated sufficiently to the relevant purchasing public. A training presentation for existing customers did not qualify, and the plaintiff failed for lack of evidence of how many potential buyers saw a brochure. Whether the competition prong survives Lexmark is debated.
Suntree (11th Cir. 2012)It is not material
In the Eleventh Circuit the plaintiff "must establish materiality even when a defendant's advertisement has been found literally false" (1-800 Contacts). The court declined to follow the Fifth Circuit's presumption in Pizza Hut and acknowledged the split. A trivial inaccuracy that does not affect buying decisions does not support liability here, even if it might elsewhere.
1-800 Contacts (11th Cir. 2002)Ambiguity defeats literal falsity
A claim open to more than one reasonable reading is not literally false. That matters: for a literally false claim the plaintiff need not prove deception, but for a misleading one it needs evidence of consumer reaction, even at the preliminary injunction stage. Pushing the case from "literally false" to "misleading" often shifts the burden onto the plaintiff's survey.
1-800 Contacts · HicksonNo standing, no injury, no causation
Under Lexmark International, Inc. v. Static Control Components, Inc. (2014), the plaintiff must allege "an injury to a commercial interest in reputation or sales" that flows directly from the deception, ordinarily because deceived buyers withheld trade from it. Consumers cannot sue under the Lanham Act. In a crowded market, a plaintiff's losses may trace to price, quality, or other sellers, not your ad.
Lexmark (2014)The Lanham Act has no statute of limitations. Federal courts in Florida apply laches, using Florida's analogous four-year period as a guide (AmBrit, Inc. v. Kraft, Inc., 1986), so a campaign the plaintiff ignored for years can support a delay defense, which must be pleaded in the answer (Rule 8(c)).
How we test the plaintiff's survey
When a claim is not literally false, the plaintiff usually needs a survey. The Eleventh Circuit has observed that an implied falsity claim "usually turns on the persuasiveness of a consumer survey" (Hickson, 2004). That makes the survey the plaintiff's most important exhibit, and often its weakest point.
Design flaws we look for
- Wrong universe. Respondents who are not the buyers of the products at issue, or a sample drawn mostly from the plaintiff's customers
- No control, or a bad one. Without a control version of the ad, the survey cannot separate the ad's effect from what people already believed
- Leading questions. Closed questions that suggest the answer, or a lead-in that frames the products the way the plaintiff wants
- Unrealistic stimulus. An ad shown in a way buyers never see it, or cropped to highlight the challenged phrase
- Coding problems. Open-ended answers coded generously to count as deception
- Wrong question. A survey of what consumers took away that says nothing about whether the message affected purchases
How we use those flaws
- Motion to exclude. Since December 1, 2023, Federal Rule of Evidence 702 requires the proponent to show it is more likely than not that the expert's opinion reflects a reliable application of reliable methods
- Weight at trial. Some survey flaws go to weight rather than admissibility; cross-examination and a rebuttal expert then matter
- Rebuttal survey. Our own properly controlled study of the ad as buyers see it
- Materiality gap. A deception survey that does not reach purchase decisions leaves the Eleventh Circuit's materiality element open
- Early timing. At the preliminary injunction stage, a hurried survey is often most vulnerable
Courts do exclude flawed surveys. In Kudos Inc. v. Kudoboard, LLC (N.D. Cal. 2021), the court excluded a Lanham Act survey because its universe left out qualified buyers and its lead-in departed from market conditions. Courts also recognize that controls are not always required; one 2025 decision held that a survey measuring only what drives purchase decisions did not need one (In re Keurig, S.D.N.Y. 2025). Results depend on the survey and the court.
The National Advertising Division as an alternative
BBB National Programs' National Advertising Division (NAD) reviews challenges to national advertising claims under procedures revised effective March 16, 2026. For an advertiser, it can be a faster and less costly place to resolve a dispute than federal court.
| From the advertiser's side | Federal court | NAD |
|---|---|---|
| Your first deadline | Answer or motion 21 days after service | Substantive response within 15 business days on the standard track (Procedures § 3.2(A)) |
| How long it takes | Months to years | Fast-Track SWIFT decisions within 20 business days of transmittal (§ 6.4(A)); standard track typically about 20 business days after NAD meets with the advertiser |
| What is at stake | Injunction, profits, damages, costs, fees in exceptional cases | A recommendation to modify or discontinue a claim; no damages |
| Focus | Plaintiff must prove falsity and the other elements | Whether your substantiation supports the claim as consumers understand it |
| Appeal | Eleventh Circuit | National Advertising Review Board (NARB) panel |
| If you do not take part | Default judgment risk | NAD may refer the matter to a government agency (§§ 2.1(I)(3), 5.1) |
| Publicity | Public court record | Final decisions are published; proceedings are otherwise confidential |
◆ marks rows where the forums differ in kind, not only degree.
Propose NAD instead of court
When a competitor sends a demand, an NAD review of the claim can be an answer that avoids damages exposure and moves quickly. NAD will not open, or will close, a case on claims that are the subject of pending litigation (§ 2.1(C)(1)(b)), so timing matters.
Procedures § 2.1(C)Respond, do not ignore
Participation is voluntary, but declining or failing to comply can lead to a referral to a government agency. A careful response that modifies or substantiates a claim often ends the matter.
Procedures §§ 5.1, 8.1Filing fees as of January 1, 2026
A challenger pays the fee. For a company under $250 million in revenue that is not a National Partner: $10,500 on the standard track and $15,750 for Fast-Track SWIFT. Fees rise with revenue; hardship waivers are available.
BBB National ProgramsDefending the FDUTPA and § 817.41 counts
Florida plaintiffs usually add state counts to the Lanham Act claim. Each has its own elements and fee rule, and some create leverage for the defense.
Anyone "aggrieved" may seek declaratory and injunctive relief; actual damages go only to a person who has "suffered a loss as a result of" the violation. Courts in the Eleventh Circuit often analyze FDUTPA counts built on the same conduct under the Lanham Act standards (Suntree), so the state count often rises or falls with the federal one.
In Pop v. LuliFama.com LLC (11th Cir. Aug. 1, 2025), the court held that Rule 9(b)'s particularity requirement applies to FDUTPA claims that sound in fraud, and affirmed dismissal of an influencer-advertising claim.
A retailer that in good faith passes on a manufacturer's or wholesaler's claims without actual knowledge of the violation is exempt from FDUTPA damages, fees, and costs under that section.
The prevailing party may recover reasonable attorney's fees and costs after judgment and all appeals. A defendant that defeats the FDUTPA count can seek its fees.
Bars misleading advertising "before the general public of the state." Florida federal courts generally require the plaintiff's own reliance; some let competition stand in for it, but not where the parties are not competitors (Orange Lake Country Club v. Castle Law Group, M.D. Fla. 2018).
A person prevailing on the claim is awarded costs including reasonable attorney's fees, and may be awarded punitive damages in addition to actual damages. Treat this count seriously even when it looks secondary.
The full FDUTPA defense, including actual damages, statutory exemptions, and the business-plaintiff question, is on Defending FDUTPA Claims in Florida. FDUTPA claims have a four-year limitations period (Fla. Stat. § 95.11(3)(e)).
From service to summary judgment
False advertising cases often move fast at the start, because the plaintiff may seek a preliminary injunction against a live campaign.
- Day 1–3Deadline and hold21 days in federal court, 20 in Florida state court; 60 days from the request if you waived service (90 if outside the U.S.). Preserve every version of the ad.
- Week 1Substantiation reviewGather the support that existed when each claim ran: tests, studies, data, approvals.
- If moved forPreliminary injunctionOppose on falsity, materiality, and delay. A § 1116(a) presumption of irreparable harm applies but can be rebutted.
- Before the deadlineMotion or answerRule 12(b)(6) where the claim is puffery or not advertising on its face, or where Rule 9(b) applies; otherwise an answer.
- With the answerDefenses and counterclaimsAffirmative defenses such as laches; compulsory counterclaims, including your own false advertising claim.
- DiscoveryTheir survey, their adsSurvey data and drafts, the plaintiff's sales records, and the plaintiff's own comparable claims.
- Dispositive motionsDaubert and summary judgmentExclude or limit the survey; summary judgment on falsity, materiality, advertising, or causation.
The preliminary injunction is often the real fight. The plaintiff must show a substantial likelihood of success, irreparable harm, a favorable balance of harms, and that the injunction serves the public interest. Since the Trademark Modernization Act of 2020, 15 U.S.C. § 1116(a) gives a plaintiff that shows likely success on a § 1125(a) claim a rebuttable presumption of irreparable harm. Months of delay after the campaign launched can rebut it. If an injunction issues, scope matters: in Osmose, the Eleventh Circuit sent parts of an order back to be limited to commercial advertising or promotion.
Should you change the ad? Pulling or revising a claim can reduce exposure and undercut an injunction motion, but it should be done deliberately and documented, after advice, so it is not framed as an admission.
What it costs if you lose
- Injunction against the claim, sometimes with corrective steps (§ 1116(a))
- Your profits attributable to the false advertising; willfulness is not a precondition (Romag, 2020)
- The plaintiff's damages, up to three times actual damages, as compensation and not a penalty (§ 1117(a))
- Corrective advertising costs, only with proof of need and cost
- Attorney's fees in exceptional cases
See Damages Evaluations for how these are measured.
Four ways these disputes end before trial
Many advertising disputes are about one sentence. The resolution can be just as narrow.
Modify the claim
Reword, qualify, or add a disclosure, with a transition period for packaging and materials already in the channel.
Substantiate and stand firm
Share enough of your support to show the claim holds up, often under a confidentiality agreement.
Move to NAD
Agree to an NAD review instead of litigation, where the remedy is a recommendation rather than money.
Mutual standstill
When both sides' ads are vulnerable, an agreement covering both campaigns and dismissing all claims.
We do not predict outcomes. Settlement terms, releases, and payment questions are covered on Responding to a Demand Letter.
Five most common mistakes in defending a false advertising claim
Most of them happen before a lawyer sees the complaint.
Building substantiation after the fact
Tests commissioned after the challenge carry less weight, and the gap invites the argument that the claim was unsupported when it ran.
Establishment claimsFind and preserve the support that existed at launch.
Conceding materiality
In the Eleventh Circuit, even a literally false claim must be shown to matter to buyers.
1-800 Contacts (2002)Make the plaintiff prove the claim drove purchases.
Leaving the survey unchallenged
A survey with the wrong universe, no control, or leading questions can be excluded or discounted, but only if someone tests it.
Fed. R. Evid. 702Retain a survey expert early.
Deleting old ads
Removing ads, posts, or listings without preserving them can lead to spoliation sanctions and loses your own evidence of what the ad actually said.
PreservationCapture and preserve before changing anything.
Ignoring the plaintiff's own advertising
A competitor that sues over advertising often runs comparable claims. Those can support a counterclaim and change the negotiation.
CounterclaimsAudit the plaintiff's claims in the first weeks.
Defending is not only saying no
A defense can change the balance of a case. These are the tools we consider at the start, because some must be raised with the answer.
Your own false advertising counterclaim
If the plaintiff's advertising makes unsupported claims about its product or yours, you can assert the same claim against it. A counterclaim arising from the same dispute is compulsory under Rule 13(a) and belongs in your answer.
15 U.S.C. § 1125(a)(1)(B)Declaratory judgment
A counterclaim asking the court to declare that your claims are true or not actionable can settle your right to keep running them, even if the plaintiff later drops its case.
28 U.S.C. § 2201Attorney's fees
Lanham Act fees are available to a prevailing party in exceptional cases under the Octane Fitness standard (Tobinick v. Novella, 11th Cir. 2018). A defendant that defeats a FDUTPA count can seek fees under § 501.2105.
15 U.S.C. § 1117(a); Fla. Stat. § 501.2105NAD challenge to the plaintiff's ads
Outside court, you can file your own NAD challenge to the competitor's advertising, provided those claims are not already in litigation.
NAD/NARB ProceduresFrequently asked questions
The competitor says our claim is false. Do they have to prove consumers were fooled?
If the claim is literally false, no. If it is only misleading, yes: the plaintiff needs evidence of what consumers took away, usually a survey. Either way, in the Eleventh Circuit the plaintiff must prove the claim was material to purchasing decisions.
Is "best" or "number one" actionable?
Vague superiority claims are generally puffery and not actionable. A specific, measurable claim, such as "number one in sales in Florida in 2025," can be proved true or false and is treated as a factual claim.
We only showed the comparison to a few customers. Is that advertising?
It depends. Under Suntree (11th Cir. 2012), the statement must be disseminated sufficiently to the relevant purchasing public. In a small industry a few presentations can be enough, but the plaintiff has to prove the reach.
Can a company that is not our competitor sue us?
Possibly. Lexmark (2014) does not require direct competition, but the plaintiff must show an injury to its commercial interest in sales or reputation flowing directly from the deception. Consumers cannot sue under the Lanham Act.
Can we move the dispute to the NAD?
Before a lawsuit is filed, an NAD review can be an alternative. NAD will not open, or will close, a case on claims that are in pending litigation. Its decisions are recommendations and include no damages.
Should we stop running the ad?
Get advice first. Modifying a claim can reduce exposure and weaken an injunction motion, but preserve every version before changing anything, and plan how the change is described.
We are a retailer repeating the manufacturer's claims. Are we liable?
Under FDUTPA, a retailer that in good faith passes on a manufacturer's or wholesaler's claims without actual knowledge of the violation is exempt from damages, fees, and costs under § 501.211. The Lanham Act has no equivalent exemption, so the federal count needs its own analysis.
Could we recover our fees if the claims against us fail?
Under the Lanham Act, only in an exceptional case. Under FDUTPA, the prevailing party may recover fees, which can include a defendant. We assess both at the start.
What should we send you?
The complaint or letter, the date of service, the challenged ads with dates and channels, and the support behind each claim. Upload them securely; an attorney reviews them the same business day after a conflict check.
Upload the complaint
Upload the complaint, summons, or demand letter, the date you were served, the challenged ads (with dates, channels, and languages), and the tests or studies behind each claim. Spanish-language advertising is welcome.
- Same-day review of the complaint and your response deadline
- Substantiation, puffery, and materiality analysis of each challenged claim
- Survey critique and rebuttal planning with outside experts
- Injunction opposition, NAD strategy, and Florida FDUTPA and § 817.41 defense
Prefer to talk first? Call or email, or message us on WhatsApp. Atendemos en español.
- 15 U.S.C. § 1125 (Cornell LII)
- 15 U.S.C. § 1117 (Cornell LII)
- Lexmark International, Inc. v. Static Control Components, Inc. (U.S. 2014)
- Johnson & Johnson Vision Care, Inc. v. 1-800 Contacts, Inc., 299 F.3d 1242 (11th Cir. 2002)
- Hickson Corp. v. Northern Crossarm Co., 357 F.3d 1256 (11th Cir. 2004)
- Osmose, Inc. v. Viance, LLC (11th Cir. 2010)
- Suntree Technologies, Inc. v. Ecosense International, Inc. (11th Cir. 2012)
- Sidley, An Amendment to Federal Rule of Evidence 702 (Dec. 2023)
- Dorsey, Faulty Universe and Suggestive Stimuli Doom Admissibility of Consumer Survey Evidence (Kudos v. Kudoboard)
- Tushnet, Materiality surveys may not need controls (In re Keurig, S.D.N.Y. 2025)
- NAD/NARB Procedures, revised effective March 16, 2026 (BBB National Programs)
- NAD Filing Tracks at a Glance, fees effective Jan. 1, 2026 (BBB National Programs)
- Fla. Stat. § 501.211 (Florida Senate)
- Fla. Stat. § 501.2105 (Florida Senate)
- Fla. Stat. § 817.41 (2026) (Florida Senate)
- Pop v. LuliFama.com LLC, No. 24-11048 (11th Cir. Aug. 1, 2025)
- Orange Lake Country Club v. Castle Law Group (M.D. Fla. 2018), summary (Tushnet)
- USLAW, The Ins and Outs of Personal and Advertising Injury Coverage
- Federal Rules of Civil Procedure, amended to Dec. 1, 2025 (GovInfo)
- Martin v. E.C. Publications, Inc. (11th Cir. 2021) (laches; AmBrit; Florida four-year period)
- Fla. R. Civ. P. 1.140, Defenses
General information, not legal advice for your situation. Statutes, rules, and fees as of October 2026. Last reviewed October 28, 2026.