Azelaic Acid

AKA: NONANEDIOIC ACID, 123-99-9, Anchoic acid, Finacea, Lepargylic acid, 1, 7-Heptanedicarboxylic acid, Azelex, Skinoren, Heptanedicarboxylic acid
Synthetic
Skin Conditioner
Acid
Clean
OriginSynthesized from oleic acid, a naturally occurring fatty acid found in plant and animal oils. Produced through oxidative cleavage of oleic acid using ozonolysis or similar oxidation methods.
Azelaic Acid is a naturally occurring dicarboxylic acid produced by Malassezia furfur and found in whole grain cereals, rye, barley and animal products. Azelaic acid possesses antibacterial, keratolytic, comedolytic, and anti-oxidant activity. Azelaic acid is bactericidal against Proprionibacterium acnes and Staphylococcus epidermidis due to its inhibitory effect on the synthesis of microbial cellular proteins. Azelaic acid exerts its keratolytic and comedolytic effects by reducing the thickness of the stratum corneum and decreasing the number of keratohyalin granules by reducing the amount and distribution of filaggrin in epidermal layers. Azelaic acid also possesses a direct anti-inflammatory effect due to its scavenger activity of free oxygen radical. This drug is used topically to reduce inflammation associated with acne and rosacea.
Solubility 2400
Formula
C9H16O4
Mol. Weight
188.22
CAS #
123-99-9
Form
Liquid
State
Pellets or Large Crystals; Other Solid
Skin Types
●all-skin-types
Best For
Uneven Texture
Pregnancy & Breastfeeding Safe
Yes
Functions
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Buffering
Provides scent
Maintains optimal pH
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory0 listings
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
2
CIR
Safe
Pregnancy
Yes
CIR Safety Findings
Skin Irritant in Testing
1 study / 1 irritating / plus 1 case report (CIR 528)
Dermal Absorption 1.29–70%
3 human and lab (in vitro) studies in the CIR safety assessment (CIR 528)
Concentration Guide
Leave-on0.007–0.3%
Rinse-off10%
0%50%100%
CIR reported use · report published 2012
Regulatory Agencies
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR
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