Valisure says the high levels are a result of the benzoyl peroxide decomposing into benzene over time when combined with other substances in acne medication — not due to contamination during ...

Benzoyl peroxide (BPO) drug products, commonly used for extended periods of time to treat acne and rosacea, degrade into carcinogenic benzene when not refrigerated, a study published in the ...

When they compared it to data from patients who had no exposure to benzoyl peroxide, the researchers found no increased risk for cancers associated with benzene among those using the creams.