- This clinically proven Neutrogena Clear & Defend Plus Daily Serum is formulated with a powerful combination of AHA (glycolic acid, mandelic acid), BHA (salicylic acid) and PHA (gluconolactone). - It contains Salicylic Acid, a purifying agent known to help prevent breakouts. - It is powered by a 10% AHA or PHA blend: 5% Glycolic Acid increases surface skin cell turnover to help fade coloured marks left after acne, 2.55% Mandelic Acid, a peeling agent that acts on the skin's regular surface renewal process to help improve skin radiance, 2.45% Gluconolactone, an exfoliator to help clear pores and refine skin texture. - For healthier-looking skin in 1 week. Developed with dermatologists. Clinically proven. Fragrance-free.