The Effaclar Ultra Concentrated Serum is the first serum La Roche-Posay has ever made which combines three key acid ingredients; Salicylic Acid, Glycolic Acid, AHA and LHA along with Niacinamide. It is designed for those with persistent imperfections and marks as well as visible pores. Effaclar Serum helps to unclog pores, smooth the skin's surface and improve skin renewal overnight. In short, it will help to improve your overall skin texture while simultaneously targeting blackheads, blemishes, and marks. This serum will help reduce the signs of ageing and is also suitable for use on acne prone skin. Proven Efficacy:Overnight, Skin feels softer, moisturised and more comfortable. For mattified finish day after day. Reduces appearance of blemishes by up to 45%Reduces appearance of blackheads by up to 21%Reduces appearance of marks by up to 49%.Skin looks resurfaced. Key Ingredients: Salicylic Acid: To unclog pores from sebum accumulationLHA: To intensely smooth the skin surface without discomfortGlycolic Acid: To improve skin renewal. How to use: Shake before use. Apply to whole face in the evening. Fast-Absorbing texture. Non-sticky finish. Non-Comodogenic. Use in association with a daily sun protection (at least SPF15). Avoid eye area.