Ingredient Guide

Azelaic Acid

Also known as: Azelaic Acid, Nonanedioic acid

NormalCombinationOilyAcne-proneRedness-prone

What It Is

A naturally occurring dicarboxylic acid found in grains like wheat and barley. Used in skincare for its brightening, anti-inflammatory, and mild exfoliating properties.

What It Does

Fades post-acne marks and hyperpigmentation, reduces redness, clears congestion, and gently exfoliates — without the sensitivity risk of stronger acids.

Best For

Post-acne marksUneven toneVisible rednessTextureRosacea-prone skin

Benefits

  • Fades post-inflammatory hyperpigmentation (PIH) effectively
  • Anti-inflammatory — reduces visible redness and supports rosacea-prone skin
  • Inhibits tyrosinase — preventing new pigmentation formation
  • Gentler than glycolic acid or retinol for brightening concerns
  • Can be used morning and evening without the sun sensitivity issues of AHAs

When to Be Careful

  • Slower to show results than stronger acids — takes consistent use over 4–8 weeks
  • Some silicone-heavy formulas (like The Ordinary suspension) can pill when over-layered
  • Still requires SPF for best results despite lower photosensitivity than AHAs
ItGirlies Ingredient Intelligence
Why This Gets Hype

Azelaic acid became the gentle brightener's answer to glycolic acid and retinol. It addresses pigmentation, redness, and texture simultaneously without the irritation risk that comes with stronger exfoliants.

What People Often Misunderstand

Its slower results are often mistaken for ineffectiveness. Azelaic acid is clinically effective — the payoff is more gradual than stronger exfoliants, not absent. Users who stick with it for 6–8 weeks consistently see meaningful improvement.

Best Routine Slot

After water-based serums, before heavier creams. Morning or evening — evening is preferred if the texture doesn't work well under makeup.

Good Match For

Redness-prone, post-acne, and combination or oily skin wanting a gentle brightener that isn't glycolic or retinol. Particularly useful during acne treatment phases.

Proceed Carefully If…

Some formulas pill when over-layered. Patch test if very reactive. Still photoactive — SPF is needed.

Signs You May Be Overdoing It

Unusual stinging, redness, or warmth after application. Rare but possible with highly reactive skin.

Commonly Found In

SerumsBrightening creamsRedness treatments

Products Containing Azelaic Acid

Azelaic Acid Suspension 10%
The Ordinary

FAQs About Azelaic Acid

Is azelaic acid good for rosacea?
Yes — azelaic acid is one of the few skincare actives with clinical evidence for rosacea management. It reduces redness and calms the skin while also addressing texture concerns.
Can I use azelaic acid with niacinamide?
Yes — they are an excellent pairing. Both target pigmentation and redness through different mechanisms, and there are no compatibility concerns between them.
Is azelaic acid gentler than glycolic acid?
Generally, yes. Azelaic acid does not increase photosensitivity as significantly as glycolic acid and is less likely to cause immediate irritation on sensitive skin.
When should I use The Ordinary Azelaic Acid Suspension 10%?
After water-based serums and before heavier creams. It can be used morning or evening — many people prefer evening to avoid pilling under makeup.
← Back to Product Decoder