Differin Gel contains an Rx-strength acne-fighting retinoid. It clears breakouts where they start (deep in the pores), prevents acne before it begins, and as a result, restores skin's texture and tone. Active ingredient: Adapalene 0.1% (retinoid). Inactive ingredients: Carbomer 940, Edisodium, Methylparaben, Poloxamer 182, Propylene glycol, purified water and Sodium hydroxide. May contain hydrochloric acid to adjust pH.