The why
Differin Daily Deep Cleanser. 5% benzoyl peroxide — distinct from Differin Gel, which is adapalene (scored 1-3). Valisure FDA Citizen Petition #8 (March 2024) found BPO can decompose into benzene, a known human carcinogen, under heat over time; Differin/Galderma products were among those named. Floor 6 reflects benzene-formation risk in the BPO active. Ingredients verified 06 2026.