Azelaic Acid for Acne: Benefits, Uses and How to Apply It
How azelaic acid works on acne and may fade post-acne dark spots, prescription 15–20% vs 10% cosmetics, how to apply it and side effects.
Ingredients
Acne ingredient guides
Guides to benzoyl peroxide, salicylic acid, sulfur, azelaic acid and niacinamide: what the evidence says, which are OTC drugs, and how to use them.
6 guides Every guide lists its sources
Benzoyl Peroxide and Benzene: What the Evidence Shows
Benzoyl peroxide can form benzene in heat, but the FDA calls the risk from recalled products very low. What studies show, and whether to stop.
Benzoyl Peroxide 2.5% vs 5% vs 10%: Which Strength to Use
Is 10% benzoyl peroxide better than 2.5%? What studies show on strength and irritation, washes vs gels, and how to choose and start gently.
Niacinamide for Acne: What the Evidence Really Shows
Does niacinamide help acne? What small studies show, which strength to use, why it isn't an FDA acne drug, and how to pair it with proven actives.
Salicylic Acid for Acne: How It Works and How to Use It
How salicylic acid unclogs pores, the 0.5–2% strengths the FDA allows OTC, what the evidence shows, how to combine it, and who should avoid it.
Sulfur for Acne: Does It Work and Who Is It For?
How sulfur treats mild acne, the 3–10% OTC strengths the FDA allows, sulfur with resorcinol, what the limited evidence shows, and how to use it.
Free acne tools
Acne treatment path quiz
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Ingredient conflict checker
Paste an ingredient list or pick products to flag common acne-routine conflicts and ingredients some people with acne prefer to avoid.
Benzoyl peroxide recall lookup
Check whether your benzoyl peroxide product was part of the 2025 recalls. Search by product name or the lot number on the package.