What is benzoyl peroxide used for in skincare?

• A. It provides UV protection.
• B. It moisturizes the skin.
• C. It calms redness but doesn't kill bacteria.
• D. An ingredient used to dry and exfoliate; releases oxygen that helps kill bacteria.

Answer: (D)

Benzoyl peroxide works in skincare as both a drying, keratolytic agent and an antimicrobial treatment for acne. It penetrates pores and decomposes to release oxygen, which helps kill the acne-causing bacteria that thrive in low-oxygen environments. At the same time, it helps shed dead skin cells and reduce excess oil, which can block pores. This combination reduces the formation of pimples and helps prevent new ones, rather than simply moisturizing or providing sun protection. It’s important to start with a lower concentration to minimize irritation and be aware it can dry the skin and may bleach fabrics.