Why is it different? This acne-fighting serum fights existing acne breakouts and prevents future breakouts on the face or body. Our Benzoyl Peroxide 5% is USP grade, meaning that it meets, or exceeds, requirements set by the United States Pharmacopeia. Why does this matter? With the highest quality of Benzoyl Peroxide available, you get a truly gentle formula that does not irritate or over dry the skin. Other Key Ingredients 24 Hour Acne Serum contains Glycolic Acid 5%, which effectively clears pores within 24 hours, leaving the skin blemish free. Soothing botanical extracts calm and soothe skin.