If you’re looking up “benzoyl peroxide benzene,” the clearest takeaway is that testing has found benzene can form in some benzoyl peroxide products, particularly under heat. But in its March 2025 testing of 95 acne products, the U.S. Food and Drug Administration (FDA) found elevated levels in six; more than 90% had undetectable or extremely low levels. That does not mean every product—or every batch of a named product—has the same result.
What Testing Says About Benzoyl Peroxide Benzene
A 2024 study by Kaury Kucera and colleagues tested seven single product lots across different benzoyl peroxide formulations. The researchers detected benzene in the products they tested, with levels increasing in laboratory tests at 37°C (98.6°F) and 50°C (122°F). In a separate test, two unopened products held at 70°C (158°F) released detectable benzene into the surrounding air. These experiments raise a concern about formation under particular conditions; they do not establish the level of exposure a person gets from using a typical product.
A later report by the same research team tested 111 over-the-counter products kept at room temperature and reported benzene measurements ranging from 0.16 to 35.30 parts per million. The FDA’s independent testing, using validated methods on 95 products, found elevated levels in six. The agency also cautioned that unvalidated third-party methods can produce misleadingly high results. These findings differ, so a result from one product sample or test method should not be treated as a verdict on every benzoyl peroxide product.
The FDA said the cancer risk from exposure to the benzene in the recalled products was very low, even with daily use for decades. Benzene is a known carcinogen, but the agency’s assessment means a reported detection does not, by itself, show that a person will develop cancer.
Why Heat And Storage Matter
The laboratory findings suggest heat can affect benzene formation. The study temperatures included accelerated stability testing and a very high temperature intended to represent a transport or vehicle heat excursion. They are not a measurement of what happens to every product in ordinary use or storage.
Keep your acne treatment as its label directs, and avoid leaving it in a hot car or near a heat source. One 2025 study found little apparent formation at 2°C (36°F) and more at 50°C in a tested prescription product, but that result does not establish a refrigerator-storage rule for all formulas. Don’t change storage conditions beyond the product’s instructions without checking with a pharmacist or prescriber.
How To Check For A Product-Specific Recall
Start with the full product name, strength, lot or batch number, and expiry date on the package. A recall may apply to particular lots rather than every item sold under a brand name. In its March 2025 notice, the FDA identified specific lots of products including La Roche-Posay Effaclar Duo, Walgreens acne treatments, Proactiv products, and SLMD Benzoyl Peroxide Acne Lotion. Zapzyt Acne Treatment Gel was also recalled after the manufacturer’s own testing. The notice is a dated example, not a guarantee that no later notices exist.
- In the United States, check the FDA’s current drug-recall information and compare the exact lot number and product name.
- In the United Kingdom, European Union, Australia, or elsewhere, check the relevant national medicines regulator’s alerts as well as the manufacturer’s recall page. A U.S. notice does not establish the recall status in another region.
The FDA described its March 2025 recalls as retail-level actions: retailers were told to remove listed products from sale, and the notice did not specifically direct consumers to take action on products already at home. It did advise discarding products beyond their expiry date. If your product matches a recall notice, follow the current instructions from the regulator or manufacturer, or ask a pharmacist what to do.
If You’re Concerned About A Product
If the product is not listed in a recall, that alone cannot tell you its benzene level—but neither does a study on other products show that yours is contaminated. Check the current notice, expiry date, and storage directions. If you use a prescribed acne treatment and are considering stopping it or switching, ask your clinician or pharmacist about suitable options. Contact a health professional if you have questions about a recalled product or your personal exposure.