Benzoyl peroxide oxygenates propionibacterium deep within pores. Highly micronized benozyl peroxide is used to minimize irritation and the amount needed per application to yield good results.

LHA exfoliates the skin's surface and inside pores to help prevent acne recurrence and prevent post-inflammatory hyperpigmentation (residual dark marks).

LHA is a proprietary anti-inflammatory and exfoliating molecule held to be six times more effective than, and more tolerable than, salicylic acid alone.

A clinical study shows a 60% visible reduction in inflammatory pustules and non-inflammatory lesions (closed comedones) within 10 days.

La Roche-Posay Effaclar AI is oil-free, paraben-free, tested on sensitive skin and able to be used underneath make-up. May be used in conjunction with other La Roche-Posay Effaclar skin care products and Biomedic LHA Cleansing Gel.

Relatively few products contain bioavailable zinc, an important antioxidant for skin, however a high concentration of absorbable zinc is found in La Roche-Posay Effaclar AI.