La Roche-Posay Effaclar Ultra Concentrated Serum is a highly effective treatment for problem skin prone to acne and enlarged pores. This intensive serum contains a combination of active ingredients that deeply cleanse pores, reduce sebum and improve skin texture. The formula is enriched with niacinamide and salicylic acid, which act synergistically in the fight against skin irregularities. The serum is easily absorbed, does not leave a greasy feeling and is suitable for everyday use. It has been clinically tested on sensitive skin and does not cause comedones, making it ideal for a problem skin care routine.