Benzoyl Peroxide

What is benzoyl peroxide, exactly? It's an antiseptic that reduces the number of microbes (bacteria) on the skin's surface. That's why benzoyl peroxide is used to treat acne.

Keep in mind that some benzoyl peroxide products are only available by prescription, since they may contain other active ingredients, such as antibiotics or retinoids.

How to use it

Use benzoyl peroxide only under a doctor's guidance.

Suitable for

Oily, combination, and acne-prone skin.

Things to know

Benzoyl peroxide may cause dryness or skin irritation. Always consult a doctor about how to use benzoyl peroxide and whether it's right for you. Also check the manufacturer's instructions for how to store it before use.

Evidence

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Ingredient Overview

INCI name Benzoyl Peroxide

Function Oxidizing

CAS number 94-36-0

Chemical formula C₁₄H₁₀O₄

Common use Face care

Benzoyl Peroxide alternatives

Salicylic Acid Azelaic Acid Retinol

FAQ

1. Can you use benzoyl peroxide with retinol?

You can use benzoyl peroxide with retinol, but it's not recommended to apply them at the same time. What does benzoyl peroxide do when combined with retinol? It can oxidize retinol, canceling out its effects, and together they can cause significant irritation. The best approach is to check with a doctor before using them together.

2. Can you use benzoyl peroxide with salicylic acid?

Yes, you can pair benzoyl peroxide with salicylic acid, but with caution—since the risk of irritation is high. Both benzoyl peroxide and salicylic acid are active acne-fighting ingredients, but they work differently. Using them together increases the risk of dryness, redness, and flaking.

3. How long should I leave benzoyl peroxide on my face?

Knowing how to use benzoyl peroxide correctly starts with timing. For cleansers (both foams and gels): apply for no more than 1-2 minutes, then rinse thoroughly with water. For leave-on products (creams and gels): apply a thin layer to clean, dry skin on the affected areas and leave it on without rinsing.