We’ve written a lot of benzene posts on this blog over the years, and most of them share a common thread. Plaintiffs find a chemical decomposition byproduct nobody put on a label, dress it up as a corporate conspiracy, and ask a court to do what years of FDA rulemaking declined to do. Every so often, though, a court doesn’t just reject the theory — it takes the theory apart piece by piece, cites every reason it fails, and locks the door on the way out. That’s In re L’Oréal USA Benzoyl Peroxide Products Litigation, 2026 WL 2719653 (S.D.N.Y. Sept. 15, 2026), where the court granted the defendant manufacturer’s motion to dismiss with prejudice, essentially ending this MDL. If you’ve been waiting for the decision that says everything the defense bar has been saying about OTC benzene litigation for the last two years, this is it.
The case involved three benzoyl peroxide (“BPO”) acne treatment products that plaintiffs allege contained or degraded into benzene, a known carcinogen. Plaintiffs allege they would not have bought the products, or would have paid less for them, had that been disclosed. The complaint pleaded four state-law causes of action — deceptive trade practices, breach of implied warranty, negligent misrepresentation/omission, and unjust enrichment — all resting on the claim that the products were “adulterated and misbranded.” Id. at *1.
This litigation traces back to a March 2024 citizen petition asking the FDA to recall BPO products, followed by an FDA notice a year later confirming that the agency’s own testing found benzene contamination in some products, though less than third-party testing had suggested, and that a limited retail-level recall was warranted — a recall that, notably, did not instruct consumers to do anything with product already in their homes because, as the FDA itself said, the cancer risk from daily use over decades is very low. The manufacturer here agreed to a single voluntary recall of one lot of one product. No plaintiff alleged buying from that lot. Id. at *2.
The manufacturer moved to dismiss on the ground that the FDCA preempts all of it. The court agreed, and it did not take a narrow path to get there. It walked through the entire regulatory architecture and closed off every possible workaround plaintiffs tried to construct.
Start with the basics — OTC drugs like these get to market without individualized FDA review so long as they comply with the applicable monograph. Here, the Acne Monograph, which functions as a regulatory recipe specifying the approved active ingredients and the labeling requirements for the category. The FDCA’s cosmetic labeling preemption provision, 21 U.S.C. § 379s(a), bars any state-law labeling requirement that is “different from or in addition to” the federal one. The Second Circuit has read that to mean that state law is preempted if it is not “exactly the same as” federal law. Id. at *4. A parallel provision, § 379r(a), does the same work for adulteration claims. Id.
The court examined the Acne Monograph and found that it says nothing about benzene. It permits BPO as an active ingredient, and it lists the required warnings, and benzene appears in none of them. That should have been the end of the misbranding theory. It was. But plaintiffs, being plaintiffs, did not stop there. They tried two workarounds, and the court shut down both.
First, plaintiffs argued that the Acne Monograph’s own “general conditions” incorporated 21 C.F.R. § 201.66’s requirement that OTC drugs list active and inactive ingredients on the label, and that benzene was an undisclosed ingredient that should have been listed. The court rejected this because benzene is not an “inactive ingredient” under the regulation, which defines a component as something a manufacturer “intended for use in the manufacture of a drug product.” Nobody alleged the manufacturer intended benzene to show up. It shows up, if at all, because BPO decomposes, not because anyone put it there. Id. at *7.
Second, plaintiffs invoked the FDCA’s general “misbranding” provision in chapter V, which prohibits false or misleading labeling, arguing it independently required a benzene warning. The court explained that chapter V is a backstop against affirmatively misleading statements — the “this product cures baldness” problem — not an engine for generating new disclosure obligations the FDA considered and declined to impose in a monograph it spent decades building. As the court put it, reading the general misbranding language to create a benzene-warning requirement the FDA never included would “directly contravene the Acne Monograph’s explicit labeling requirements.” Id. at *6. We’d go further than the court did and just call that reading absurd. The FDA looked at BPO for the better part of a century, decided the word “cancer” shouldn’t even appear on the label, and plaintiffs want a court to override that considered judgment using the FDCA’s general catch-all clause. No.
The court also made quick work of plaintiffs’ attempts to use two recent Second Circuit decisions — Rutledge v. Walgreen Co. and Yousefzadeh v. Johnson & Johnson Consumer Inc. — as escape hatches. Rutledge says manufacturers are permitted to add supplemental warnings; it does not say they are required to. And the dictum in Yousefzadeh about a monograph drug still being misbranded if it has “a dangerous effect on the user” was aimed at something like cyanide in a bottle, not a substance the FDA specifically evaluated and approved as an ingredient. Nice try, but citing a case for a principle it doesn’t actually support is not a strategy that wins in front of a court paying attention — and this court was paying attention. Id. at *8.
Next the court dismantled plaintiffs’ claimed “2 ppm federal benzene cap.” Plaintiffs alleged that a 2 parts-per-million cap on benzene existed under federal law, that the products exceeded it, and that this made the products “adulterated.” The court found no such cap exists anywhere in the FDCA or FDA regulations, and without it, the adulteration theory has nothing to stand on.
Plaintiffs tried three sources for this imaginary cap, and the court took each one out individually. The voluntary recall notice doesn’t establish it — a voluntary recall does not, by itself, establish a violation of federal requirements, and the notice itself never called the recalled product “adulterated.” Id. at *9. FDA guidance documents and warning letters don’t establish it either — they are expressly non-binding, don’t carry the force of law, and the FDA’s own Q3C Guidance says on its first page that it creates no rights and binds nobody. Id. at *9-10. And the USP doesn’t establish it. Chapter 467’s 2 ppm figure applies only to benzene as a “residual solvent,” meaning a chemical used or produced directly in manufacturing that isn’t fully removed by practical techniques. But plaintiffs’ own complaint described a multi-step decomposition process — BPO breaking down into benzoic acid radicals, which further decompose into benzene radicals, which then produce benzene — not a residual solvent. Plaintiffs’ own pleading defeated their theory. Id. at *10.
As a parting shot, the court noted that USP Chapter 467 repeatedly uses the word “should,” not “shall” — and under ordinary usage, “should” recommends, it doesn’t mandate. Even if plaintiffs had cleared every other hurdle, they were trying to build a federal requirement out of a document that speaks in suggestions. Id.
The court denied leave to amend and dismissed with prejudice, reasoning that plaintiffs had already amended once, had been given a further opportunity to amend before this motion was even fully briefed and declined to take it, offered no proposal for how a new complaint would fix anything, and — most importantly — were trying to plead around a preemption defect that no amount of additional facts can cure. Id. at *11. This isn’t a case getting narrowed for round two. It’s over.
This opinion is as complete a preemption win as you’ll see in the OTC benzene space, and it’s worth reading in full for the sheer discipline of it — every plaintiff argument gets a paragraph, and every paragraph ends the same way. But there is another part of this decision that we want to highlight. It’s the court’s recognition, running through the whole opinion, that the FDA already did the science here, and plaintiffs’ lawyers are trying to use an economic class action complaint to relitigate a regulatory judgment the agency reached after decades of study.
The court didn’t gloss over this. It noted that BPO’s tendency to decompose into benzene has been studied since 1936, that the FDA has been examining BPO’s safety since the early 1980s, that the agency concluded in 1982 that BPO at these concentrations is safe and effective. Further, when the FDA finalized the Acne Monograph in 2010, its own advisory committee unanimously decided the word “cancer” shouldn’t even appear on the label. That is not an agency that overlooked benzene. That is an agency that considered it, repeatedly, over the course of roughly ninety years, and made a judgment call. The court’s language on this point deserves to be quoted directly:
[W]here the FDA has constructed an elaborate labeling framework [in a monograph] specifying labeling requirements, and [a particular substance] appear[s] nowhere in that framework, the inference that the agency made a considered judgment about label content is substantially stronger than in cases where the regulatory scheme merely touches on the relevant product category.
Id. at *7 (quoting Brower v. Colgate-Palmolive Co., 2026 WL 1831253, at *5 (S.D.N.Y. June 25, 2026).
That’s the whole ballgame, and it’s an argument we’ve been making for years across every mass tort that tries to use a courtroom as a second regulatory agency. Litigation should not lead science, and it especially should not lead science that the actual scientific regulator has already led. Plaintiffs’ lawyers didn’t bring new data. They didn’t bring a new toxicological study. They brought a reading of “should” as “shall,” a warning letter with no legal force, and a recall notice that says the opposite of what they needed it to say — and asked a federal court to override the FDA’s considered, decades-long judgment anyway. The court said no. Score one for letting the people who actually do the science keep doing the science. We’ll take it.






