Azelaic Acid: effective % & pH 아젤라산
⚡ Quick answer: Azelaic Acid: effective concentration 10% (OTC cosmetic); 15–20% is prescription-tier, optimal pH 4.0–5.0, evidence Strong. A 10% azelaic product is the cosmetic OTC standard; '20%' figures refer to prescription products, so a higher label number usually means a different regulatory category.
How much Azelaic Acid actually works? Here's the dosage, pH and evidence — the formulator-level read behind the % on a Korean label.
| Effective % | 10% (OTC cosmetic); 15–20% is prescription-tier |
|---|---|
| Optimal pH | 4.0–5.0 |
| Evidence | Strong |
| Onset | 6–12 weeks |
What the % on the label really means
A 10% azelaic product is the cosmetic OTC standard; '20%' figures refer to prescription products, so a higher label number usually means a different regulatory category.
⚠️ Ceiling: OTC tops out near 10%; higher strengths are regulated/medical, not standard cosmetics.
Azelaic Acid guide →How Azelaic Acid works →
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Explore the full K-beauty hub →✍️ Written & reviewed by the KoreaPlus Editorial team — dermatologist-informed, cosmetic-science researched & source-cited. Last reviewed 2026-06-21.
General educational information using cosmetic structure-function wording — not medical advice. Always patch-test new actives. © KoreaPlus.