Azelaic Acid
A multifunctional dicarboxylic acid — well tolerated across skin types
Function in skin biology
Azelaic acid is a naturally occurring dicarboxylic acid, also produced by certain yeasts found on normal skin. It is one of the more extensively studied multifunctional actives in dermatological and cosmetic literature, evaluated for its association with visible tone evenness and its generally favourable tolerability profile relative to some other acids.
Why Ambernay evaluates it
Azelaic acid is evaluated where a formula objective calls for a tone-supporting active with a comparatively gentle tolerability profile, including for skin types that may not tolerate stronger acids or retinoids well. Prescription-strength azelaic acid (15–20%) is a medical treatment requiring physician supervision — cosmetic formulations use it at lower, non-drug concentrations.
Where concentration matters
Cosmetic azelaic acid formulas are typically below 10%, with many leave-on formulas in the 4–10% range. This is distinct from prescription formulations, which are regulated as drugs and used under medical guidance for diagnosed conditions.
What we do not claim
We do not claim that cosmetic-grade azelaic acid treats rosacea, acne or any diagnosed dermatological condition — those are medical claims requiring a regulated drug product and physician oversight. Cosmetic azelaic acid is evaluated for its visible tone-support function only.
Best paired with
Azelaic acid is generally compatible with niacinamide and most barrier-support actives. As with most active acids, daytime use should be paired with SPF.
Claim caution / regulatory note
Azelaic acid above certain concentrations is regulated as a drug in several markets (e.g., 15-20% formulations are prescription products in the US and EU). Cosmetic-grade formulations at lower concentrations must restrict claims to cosmetic function — visible tone, skin feel — and cannot reference treatment of any diagnosed skin condition.