Benzoyl peroxide is an over-the-counter antibacterial agent that kills the bacteria (P. acnes) responsible for breakouts.  According to Paula Begoun, the amount of research demonstrating the effectiveness of benzoyl peroxide is exhaustive and conclusive she says, benzoyl peroxide [has the] ability to penetrate into the hair follicle to reach the bacteria that are causing the problem, and then [kill] them—with a low risk of irritation.  Not only does it prevent acne, but it also helps dry up the existing blemishes.  The treatment is available in strengths ranging from 2.5 to 10%, it is suggested to start with a low dosage which can be less irritating and just as effective, your dosage amount depends on how stubborn the bacteria in your pores tends to be.

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