La Roche-Posay Effaclar Ultra Concentrated Serum is a powerful anti-imperfection serum designed to target the root causes of acne. This innovative formula combines the power of salicylic acid and niacinamide to provide a targeted solution for acne-prone skin. It helps to prevent the formation of new blemishes, keeping the skin clear and blemish-free. Experience the transformative power of this ultra-concentrated serum and say goodbye to imperfections.