Herbert P. Goodheart, MD 1971 (Hahnemann Medical College). Acne For Dummies (2006). p. 234.

Benzoyl peroxide is the most commonly used over-the-counter acne medication, and is also the most effective medication for treating PFB. It comes in varying strengths ranging from 2.5 to 10 percent. There’s no proof that anything higher than 2.5 percent works any better than the higher concentration, and the lower concentrations are cheaper and may be less irritating to your skin. Clear By Design, Clearasil, Fostex, Neutrogena, and Noxzema are just a few of the benzoyl peroxide brand names available.

The statement beneath from this abstract feels paradoxical.

The 2.5% benzoyl peroxide formulation was more effective than its vehicle and equivalent to the 5% and 10% concentrations in reducing the number of inflammatory lesions (papules and pustules).

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    It's actually not unusual for the most effective dose of a drug to be a lower one. – Carey Gregory Aug 5 '18 at 15:13

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