High levels of benzene, a chemical linked to cancer, can form in many popular acne treatments containing benzoyl peroxide, according to a new report by independent testing laboratory Valisure.

Valisure tested dozens of prescription and over-the-counter products, including popular brands Proactiv, Clinique, Clearasil and Target Corp.’s Up & Up, and found they can contain “unacceptably high” levels of the carcinogen.

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