La Roche-Posay Effaclar Serum is an advanced acne treatment serum formulated with salicylic acid and thermal spring water. This concentrated formula targets persistent acne, unclogs pores, and helps reduce imperfections while being gentle enough for sensitive skin. The serum comes in a 30ml bottle with a dropper applicator for precise application. It contains La Roche-Posay's signature thermal spring water known for its soothing and antioxidant properties. The formula is dermatologically tested and suitable for acne-prone and sensitive skin types. For best results, apply in the evening after cleansing and before moisturizer.