Benzoyl Peroxide
Benzoyl Peroxide — an over-the-counter acne ingredient that releases oxygen into pores to kill acne-causing bacteria and help clear breakouts. It also has mild exfoliating and oil-reducing effects, making it a common first-line option for inflammatory acne.
Key points
- Benzoyl peroxide reduces Cutibacterium acnes, the bacteria linked to inflammatory acne, without promoting antibiotic resistance.
- It is available in concentrations commonly ranging from 2.5 to 10 percent, with lower strengths often just as effective and less irritating.
- Common side effects include dryness, redness, peeling, and a stinging sensation, especially when first starting.
- It can bleach fabrics, towels, and colored hair on contact, so care is needed during application.
- It is often used alongside moisturizers or other actives to balance its drying effect.
Frequently asked
How long does benzoyl peroxide take to work?
Visible improvement usually takes about four to twelve weeks of consistent use. Starting with a lower concentration can reduce irritation while the skin adjusts.
Can I use benzoyl peroxide with retinoids or vitamin C?
It can be combined with many actives, but pairing it with certain ingredients may increase irritation or reduce potency, so alternating them at different times of day helps. A dermatologist can advise on the best routine.
Related topics
This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.
