La Roche-Posay’s parent company, L’Oréal, is facing two separate lines of class action litigation. One set of lawsuits alleges that the brand’s Effaclar Duo acne treatment contained benzene, a known carcinogen, because its benzoyl peroxide active ingredient degrades into benzene during ordinary storage. A separate 2025 lawsuit alleges that La Roche-Posay’s Anthelios Melt-In-Milk sunscreen delivers only about half its advertised SPF 60 protection. Both matters remain active as of mid-2026, with no settlements or merits rulings reported.
The Benzene Claims Against Effaclar Duo
The benzene litigation grew out of a March 2024 citizen petition from Valisure, an independent lab. Valisure tested 66 benzoyl peroxide acne products by incubating them at elevated temperatures and found benzene in 42 of them above 10 parts per million, with 17 above 100 ppm and two above 1,500 ppm. The FDA’s conditional limit for benzene in drug products is 2 ppm.1Valisure. FDA Citizen Petition on Benzene in Benzoyl Peroxide Products
What made the finding different from earlier benzene scares in sunscreens and dry shampoos: the benzene was not a raw-material impurity. Benzoyl peroxide itself breaks down into benzene, and the reaction accelerates with heat. Products left in a warm car or shipped through hot climates can develop significantly higher levels over time.2National Institutes of Health (PubMed Central). Benzene Formation in Benzoyl Peroxide Products Valisure also detected benzene escaping from unopened packaging into the surrounding air.3Valisure. Valisure Citizen Petition on Benzene in Benzoyl Peroxide Drug Products
A 2025 peer-reviewed study in the Journal of Investigative Dermatology tested 111 over-the-counter benzoyl peroxide products at room temperature and found benzene concentrations from 0.16 to 35.30 ppm. The same researchers found that benzene formed when benzoyl peroxide was applied to skin-mimicking surfaces and exposed to UV light below peak sunlight intensity.4PubMed. Evaluation of Benzene Presence and Formation in Benzoyl Peroxide Drug Products
Plaintiffs’ complaints rely on failure-to-warn, negligence, and consumer fraud theories. They allege L’Oréal knew or should have known that benzoyl peroxide can degrade into benzene, a phenomenon documented in scientific literature since 1936, but marketed the products as safe without testing for the contaminant. The alleged health risks include blood cancers such as acute myeloid leukemia, myelodysplastic syndrome, and non-Hodgkin lymphoma, along with anemia, immune damage, and reproductive harm.5Top Class Actions. La Roche-Posay Class Action Claims Benzoyl Peroxide Products Contain Benzene
The FDA Recall and What Replaced Effaclar Duo
The FDA released its own testing results on March 11, 2025, after examining 95 benzoyl peroxide acne products. Six had elevated benzene levels, including Effaclar Duo Dual Action Acne Treatment. Products from Walgreens, Proactiv, and SLMD were also named, and Zapzyt Acne Treatment Gel was recalled separately by its manufacturer. More than 90 percent of the products tested came back with undetectable or extremely low levels.6U.S. Food and Drug Administration. Voluntary Recalls Initiated After FDA Testing Acne Products Benzene Findings
L’Oréal issued a voluntary recall covering all U.S. lots of Effaclar Duo, not just the specific lot the FDA flagged (Lot MYX46W, expiring April 2025). A company spokesperson said the “trace levels” detected did not pose a safety risk but that L’Oréal was “committed to upholding the highest quality standards” and had chosen to “proactively” pull remaining units. The recall was conducted at the retail level. The FDA did not tell consumers to throw away units they already owned, though it did recommend discarding any product past its expiration date.7Health.com. La Roche-Posay Recall6U.S. Food and Drug Administration. Voluntary Recalls Initiated After FDA Testing Acne Products Benzene Findings
The FDA described the cancer risk from benzene exposure through these products as “very low,” even with daily use over decades. The agency also reminded manufacturers that they are legally responsible for keeping their products free of harmful contamination.6U.S. Food and Drug Administration. Voluntary Recalls Initiated After FDA Testing Acne Products Benzene Findings
Rather than bringing back the original formula, L’Oréal replaced Effaclar Duo with Effaclar Duo+M (Multi-Target Acne Treatment). The new version drops benzoyl peroxide in favor of 0.5% salicylic acid, along with a proprietary ingredient called Phylobioma and niacinamide. It sells for $24.99 in the U.S.8La Roche-Posay. Effaclar Multi-Target Acne Treatment With Salicylic Acid
Where the Benzene Cases Stand
Plaintiffs asked the U.S. Judicial Panel on Multidistrict Litigation to consolidate the L’Oréal benzene cases. On February 7, 2025, the Panel denied consolidation in MDL No. 3141, concluding that centralization was unnecessary because the parties were already self-organizing. Three of the six cases were already before a single judge in the Southern District of New York (Noakes, Abednego, and O’Dea), and pending transfer motions could bring in the rest without formal MDL treatment.9U.S. Judicial Panel on Multidistrict Litigation. MDL No. 3141 Order Denying Transfer
As of mid-2026, class actions are pending in California, Hawaii, New Jersey, and Wisconsin, according to plaintiffs’ counsel at Wisner Baum. Defendants are seeking dismissal. No settlements or significant rulings on the merits have been reported.10Class Action U. Multidistrict Litigation Moves Forward Against L’Oréal Over Benzene Contamination in CeraVe Acne Products
A related case involving a different defendant hints at the defense L’Oréal may pursue. In Kouyate v. L. Perrigo Company, a federal judge in Michigan dismissed a benzene-in-benzoyl-peroxide class action against Padagis US, holding that the plaintiff’s state-law claims were preempted by the Federal Food, Drug, and Cosmetic Act because they would impose requirements beyond federal law. The court rejected the defendant’s standing argument, finding the alleged injury sufficiently concrete.11Michigan Lawyers Weekly. Class Action Over Benzene Dismissed as Preempted
The Anthelios Sunscreen SPF Class Action
The second lawsuit has nothing to do with benzene. In Barrales v. L’Oréal USA, Inc. (Case No. 2:25-cv-07912), filed August 22, 2025, in the U.S. District Court for the Central District of California, plaintiff Tina Barrales alleges that La Roche-Posay’s Anthelios Melt-In-Milk Sunscreen does not deliver its advertised SPF 60 protection. Barrales, a Los Angeles County resident, bought the product at a Target in Norwalk, California, for $37.99.12Truth in Advertising. Barrales v. L’Oreal dba La Roche-Posay Complaint
The complaint alleges that independent testing conducted using FDA methods found the sunscreen provided only SPF 34 protection, roughly half the labeled value. The claims include unjust enrichment, fraud, negligent misrepresentation, breach of express and implied warranties, and violations of California’s False Advertising Law and Unfair Competition Law. Barrales is seeking to represent a nationwide class of purchasers going back six years and a California subclass going back four years, and has demanded a jury trial along with damages, restitution, and injunctive relief.13Top Class Actions. L’Oréal Class Action Alleges La Roche-Posay Sunscreen SPF Overstated The case remains pending in 2026 with no reported rulings or motions.14Truth in Advertising. La Roche-Posay Anthelios Melt-in-Milk Sunscreen
What This Means If You Bought One of These Products
If you have an unused tube of the original Effaclar Duo with benzoyl peroxide, it has been pulled from retail and is likely past its expiration date; the FDA recommends discarding expired product. The reformulated Effaclar Duo+M does not contain benzoyl peroxide and is not part of the benzene litigation. If you purchased Anthelios Melt-In-Milk within the past six years (or the past four years in California), you may fall within the proposed class in the SPF case, though class certification has not yet been decided. Neither line of litigation has produced a settlement fund or claims process to date.