Benzoyl peroxide in a wash is one of the few rinse-off actives with genuinely decent evidence, and the reason is worth understanding: BPO is substantive — it penetrates and is retained in the pore even after you rinse.
The evidence is real. A 6% BPO wash used for a 20-second contact time, once daily, produced a greater than 100-fold reduction in acne bacteria — including antibiotic-resistant strains.
4% is a real, working concentration, which matters (see below).
And it has ceramides and niacinamide in it, which is genuinely thoughtful: BPO is drying and irritating, and building barrier support into the same product is the right response.
Benzoyl peroxide does not breed antibiotic resistance, unlike topical antibiotics. That is a significant advantage.