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Azelaic Acid

B
lead outcome
Acne (appearance, cosmetic-strength topical)
grades vary by outcome ↓
Small molecule (non-peptide)
also called — AzA · azaleic acid (common misspelling) · nonanedioic acid · 1,7-heptanedicarboxylic acid · INCI: Azelaic Acid
skin appearance (cosmetic)hyperpigmentation appearanceeven tone / brighteningblemish appearanceredness appearance
In brief

Azelaic acid (AzA) is a dicarboxylic acid from grains and skin yeast, and one of dermatology's most versatile, best-tolerated actives — calming the look of redness, clearing the appearance of breakouts, and fading pigment through selective tyrosinase inhibition. A 2023 systematic review of 43 randomised trials found it more effective than vehicle for acne, rosacea, and melasma, with 20% azelaic comparable to 4% hydroquinone for melasma. It is graded B rather than A on honest discipline: the strongest data sits at prescription strength (15–20%), the cosmetic-accessible form is milder, results are formulation-dependent (poor solubility and penetration), and no RCTs support an anti-aging use. The prescription forms are medicines for acne and rosacea and a dermatologist's call.

Legal standing, by region
International
Lawful cosmetic (lower-strength / derivative); prescription at 15–20%

Topical azelaic acid is a lawful cosmetic ingredient at cosmetic strengths (products are often around 10%, or use gentler azelaic derivatives). Separately, 15% gel and 20% cream are regulated PRESCRIPTION medicines for acne and rosacea in many regions — stronger forms that are a dermatologist's decision and outside the scope of this cosmetic grade.

Evidence, by outcome
How we grade →

An honest grade per outcome — drawn from the evidence, not any catalogue. Hype and undemonstrated marketing claims grade low.

OutcomeEvidence base · effectGrade
Acne (appearance, cosmetic-strength topical)
Strongest data at prescription 15–20%; cosmetic-accessible form is milder; acne is a medical condition
King 2023 systematic review (43 RCTs) — azelaic more effective than vehicle; comparable to topical retinoids on inflammatory lesions in review-level evidence · Reduced appearance of breakouts and post-acne marks
B
Rosacea — redness & bumps (appearance)
The prescription 15% gel holds the strongest data; rosacea is a condition for a dermatologist
King 2023 — 15% gel comparable to (or better than) metronidazole in review-level evidence · Calmer-looking redness, papules, and pustules
B
Hyperpigmentation / PIH (appearance)
Gradual; formulation-dependent; daily sun protection essential
King 2023; selective tyrosinase inhibition of overactive melanocytes, fading a spot without lightening surrounding skin · Gradual fading of dark spots and post-inflammatory marks
B
Melasma (appearance)
Strongest at 20% (prescription); melasma recurs and needs a dermatologist for stubborn cases
King 2023 + Albzea 2023 meta-analysis — 20% azelaic comparable to 4% hydroquinone and better than 2% hydroquinone; lower melasma severity index than hydroquinone across pooled trials · Visible evening of melasma-related pigmentation over weeks to months
B
Skin-aging / wrinkles
No controlled evidence supports an anti-wrinkle claim
King 2023 found no eligible RCTs for skin-aging · Not demonstrated
F
"Azelaic acid derivative" equivalence
No human study has compared a derivative head-to-head against azelaic acid itself, so the equivalence has never been tested. The 43 pooled RCTs and the melasma meta-analysis enrolled azelaic acid at 15–20% with no derivative arm; the one lower-strength comparison varied the vehicle, not the molecule. Relabelling to a derivative is an honest ingredient name — inheriting the azelaic trial record is not.
Marketing claim
F
Safety & tolerability (topical)
Mild, transient tingling is common early; patch test. Pregnancy compatibility is a doctor's call to confirm, not medical clearance
Broad cosmetic and prescription use; well tolerated · Generally well tolerated; widely regarded as often compatible with pregnancy
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Disclosure

Vallydia sells its own cosmetic serums, and some ingredients graded here belong to the same categories as those products. Grades are drawn from the published evidence by the method we publish, and applied to our own ingredients on the same terms — our copper-peptide serum is graded no more kindly than the peptides it competes with. We disclose the interest so you can weigh it.

Trade names shown here (for example Matrixyl, Argireline, Syn-Ake) are the property of their respective owners and are used only to identify the ingredient under discussion. Their appearance implies no affiliation with, or endorsement by, the proprietor.

Evidence changes

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Cosmetic claims boundary
✓ Allowed (appearance / feel)
  • for the appearance of a clearer, more even complexion
  • helps reduce the look of dark spots and blemishes
  • for calmer, less red-looking skin
  • supports a smoother-looking, more uniform tone
✕ Not allowed (medicinal)
  • treats acne
  • treats rosacea
  • treats melasma
  • cures dark spots
  • inhibits tyrosinase
  • anti-inflammatory
  • antibacterial
  • reverses aging
  • anti-wrinkle

The medicinal-sounding science stays in the reference section; product copy speaks only to appearance/feel (Reg 655/2013). Different fields, never merged.

The honest part

This entry grades the COSMETIC-accessible topical form, framed around the appearance of skin. Prescription 15% gel and 20% cream are regulated medicines for acne and rosacea — stronger, and a dermatologist's decision, not something to self-manage. There is no good evidence azelaic acid does anything for wrinkles. Persistent acne, rosacea, or melasma is best assessed by a dermatologist; melasma in particular recurs and needs strict daily sun protection. Azelaic acid is widely regarded as often compatible with pregnancy, but that is a conversation to confirm with your own doctor, not medical clearance.

Identity

a dicarboxylic acid (nonanedioic acid, a nine-carbon chain) found naturally in barley, wheat, and rye, and produced on skin by the commensal yeast Malassezia. In skincare it is a small, well-tolerated multi-use active — a single molecule with anti-pigment (tyrosinase-inhibiting), calming, and pore-clearing action. It exists as a lower-strength cosmetic ingredient (often around 10%, or as gentler azelaic derivatives) and as higher-strength prescription medicines (15% gel, 20% cream) for acne and rosacea. For the full readable explanation of what it is and how it works, see the companion guide, what is azelaic acid?

Development & history

  • A naturally occurring dicarboxylic acid, studied in dermatology for decades.
  • Established as a prescription topical for acne (20% cream) and rosacea (15% gel), with a large randomised-trial base built up across the 1980s–2010s.
  • Adopted into cosmetic skincare at lower strengths and as derivatives (such as potassium azeloyl diglycinate) for the appearance of uneven tone, blemishes, and redness.
  • Consolidated by a 2023 systematic review (King et al.) pooling 43 randomised controlled trials across acne, rosacea, and melasma.

Mechanism (as proposed)

a dicarboxylic acid with several documented actions in skin: it inhibits tyrosinase (the rate-limiting enzyme of melanin synthesis) preferentially in overactive melanocytes, so it tends to fade a dark spot without lightening the normal skin around it; it scavenges reactive oxygen species (the basis of its calming, redness-reducing use); and it is mildly antimicrobial and normalises follicular keratinisation (relevant to the appearance of breakouts). Its poor water solubility and limited skin penetration make the delivery vehicle central — which is why results are formulation-dependent rather than guaranteed by "contains azelaic."

Related reading

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Chemical identifiers

Cross-reference identifiers for the authoritative external databases — not a recipe, and nothing about how to use it.

PubChem CID2266
InChIKeyBDJRBEYXGGNYIS-UHFFFAOYSA-N
SMILESC(CCCC(=O)O)CCCC(=O)O
UNIIF2VW3D43YT
DrugBankDB00548

via PubChem exact-name match (Azelaic Acid) · high confidence

Sources — 3 cited
01King S, Campbell J, Rowe R, Daly ML, Moncrieff G, Maybury C. A systematic review to evaluate the efficacy of azelaic acid in the management of acne, rosacea, melasma and skin aging. J Cosmet Dermatol. 2023;22(10):2650-2662.
02Albzea W, AlRashidi R, Alkandari D, et al. Azelaic Acid Versus Hydroquinone for Managing Patients With Melasma: Systematic Review and Meta-Analysis of Randomized Controlled Trials. Cureus. 2023;15(7):e41796.
03McKesey J, Tovar-Garza A, Pandya AG. Melasma Treatment: An Evidence-Based Review. Am J Clin Dermatol. 2020;21(2):173-225.
Updated 2026-07-20

Grades reflect the published evidence, not our interest. No dosing, reconstitution, or administration is published for research compounds — that restraint is deliberate.

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This site provides neutral scientific reference and sells only products lawful in your region. Nothing here is medical advice, a recommendation, or an offer to supply unapproved medicines. No dosing or administration is published for research compounds. Cosmetic peptides per Regulation (EC) 1223/2009. Unapproved injectable peptides are neither sold nor advertised in the EU (Directive 2001/83/EC, Title VIII). © 2026 Vallydia.