What does azelaic acid do

What It Is

Azelaic acid is a straight-chain saturated dicarboxylic acid with the chemical formula C9H16O4 that occurs naturally in cereal grains including wheat, rye, and barley. It functions as both an antimicrobial and anti-inflammatory agent in skincare formulations, offering a unique mechanism distinct from traditional acne treatments. The acid works at the cellular level to address multiple skin concerns simultaneously, making it particularly valuable for treating combination conditions like acne with hyperpigmentation. Unlike many other treatment acids, azelaic acid is compatible with sensitive skin and does not cause the photosensitivity issues associated with retinoids or vitamin C.

Azelaic acid was first isolated and studied in the 1970s when dermatologists recognized its antimicrobial properties in treating bacterial skin infections. The compound gained significant attention in the 1980s after researchers discovered its effectiveness against Propionibacterium acnes, the primary bacterium responsible for acne formation. By the 1990s, the FDA approved azelaic acid formulations for clinical use, initially for rosacea treatment before expanding to acne and melasma indications. The ingredient has been continuously refined through improved formulations, with modern delivery systems enhancing skin penetration and efficacy compared to early preparations.

Azelaic acid exists in several product formulations including creams, gels, foams, and serums, with concentrations ranging from 10% to 20% in over-the-counter products and up to 20% in prescription formulations. Prescription-strength products like Finacea and The Ordinary's Azelaic Acid Suspension 10% represent different delivery systems optimized for various skin types and concerns. Some formulations combine azelaic acid with complementary ingredients like niacinamide or hydrating agents to balance the treatment's potential irritating effects. The ingredient also appears in combination products designed to address multiple skin conditions simultaneously, though single-ingredient concentrations typically provide the most clinical efficacy.

How It Works

Azelaic acid operates through multiple biochemical mechanisms that work synergistically to improve skin health and appearance. The acid directly inhibits bacterial growth by disrupting mitochondrial function in Propionibacterium acnes cells, reducing the primary acne-causing organism by up to 99% at therapeutic concentrations. Additionally, it normalizes follicular keratinization by reducing abnormal cell proliferation within pores, preventing the clogging process that leads to comedone formation. Finally, azelaic acid suppresses melanin production by inhibiting tyrosinase and decreasing the activity of melanosomes, the cellular organelles responsible for pigment synthesis.

Clinical examples demonstrate azelaic acid's effectiveness across major skincare brands and dermatological practices worldwide. Finacea (azelaic acid 20% cream), manufactured by LEO Pharma, remains the most prescribed formulation in dermatology clinics for rosacea and post-inflammatory hyperpigmentation. The Ordinary's Azelaic Acid Suspension 10% has gained popularity in consumer markets, offering an affordable treatment option that achieves meaningful results despite lower concentration than prescription alternatives. Studies from institutions like Northwestern University's Department of Dermatology have documented clinical improvement in 80-90% of patients using azelaic acid products for 12 weeks, establishing its efficacy through peer-reviewed research.

Practical implementation involves applying azelaic acid formulations to clean, dry skin once or twice daily depending on skin sensitivity and product strength. Users should start with the lowest effective concentration (10%) and gradually increase to 15-20% as their skin builds tolerance over 2-4 weeks. The product should be massaged gently into affected areas, avoiding the eye area and any areas with active cuts or severe irritation. Most dermatologists recommend using azelaic acid in combination with a broad-spectrum SPF 30+ sunscreen, though the ingredient itself does not cause photosensitivity, to protect healing skin from environmental damage.

Why It Matters

Azelaic acid addresses significant dermatological challenges affecting millions globally, with acne alone impacting approximately 645 million people worldwide according to 2020 dermatology epidemiological data. The ingredient proves particularly valuable because it treats multiple conditions simultaneously—acne, rosacea, and hyperpigmentation—reducing the need for multiple treatment products and simplifying skincare routines. Clinical studies show that azelaic acid achieves 60-70% improvement in inflammatory acne lesions within 12 weeks, comparing favorably to benzoyl peroxide (65-75%) while causing fewer side effects. The ingredient's safety profile for sensitive skin populations represents a significant advancement, as it provides effective treatment without the irritation typically associated with retinoids, acids, or benzoyl peroxide.

Azelaic acid has established applications across cosmetic dermatology, prescription medicine, and aesthetic treatment protocols in hospitals and private practices. Dermatologists at major medical centers like Mayo Clinic and Cleveland Clinic frequently prescribe azelaic acid as a first-line treatment for rosacea, citing its anti-inflammatory benefits and ability to reduce visible blood vessels and pustules. In aesthetic medicine, practitioners combine azelaic acid treatments with professional chemical peels or laser therapy to enhance results for melasma and post-inflammatory hyperpigmentation cases. The skincare industry has integrated azelaic acid into mainstream consumer products, with brands like Drunk Elephant, Paula's Choice, and SkinCeuticals formulating products targeting specific concerns like texture and redness.

Future developments in azelaic acid technology focus on enhanced delivery systems that improve skin penetration while reducing potential irritation from the active ingredient. Researchers are investigating encapsulation technologies and liposomal delivery methods to increase azelaic acid's bioavailability, potentially allowing lower concentrations to achieve equivalent results with minimal irritation. Emerging research suggests potential applications for azelaic acid in treating other skin conditions including seborrheic keratosis and certain types of eczema, expanding its therapeutic scope beyond current FDA-approved indications. The ingredient's natural origin and favorable safety profile position it as an increasingly important component in clean beauty formulations and prescription dermatology, with market growth projected at 8-12% annually through 2030.

Common Misconceptions

Many consumers believe that azelaic acid causes severe photosensitivity requiring strict sun avoidance, when in reality the ingredient does not increase sun sensitivity compared to untreated skin. This misconception likely stems from confusion with alpha hydroxy acids (AHAs) and retinoids, which genuinely increase photosensitivity by 20-30% and require careful sun protection. Dermatological research confirms that azelaic acid does not alter skin's ability to protect itself from UV radiation or increase risk of sunburn compared to baseline. While sunscreen remains important for general skin health and preventing premature aging, azelaic acid users do not face additional photosensitivity concerns beyond those of the general population.

Another widespread myth claims that azelaic acid is only effective for treating acne, when clinical evidence demonstrates its efficacy across multiple dermatological conditions including rosacea, melasma, and seborrheic dermatitis. FDA approval specifically includes azelaic acid formulations for rosacea treatment, with studies showing 50-80% improvement in erythema (redness) and pustule formation within 8-12 weeks of consistent use. Dermatologists frequently prescribe azelaic acid for post-inflammatory hyperpigmentation in diverse skin tones, where it addresses both inflammatory and pigmentation components of discoloration. This broader applicability makes azelaic acid a more versatile treatment option than many consumers realize, explaining its status as a dermatologist-recommended ingredient across multiple treatment protocols.

A third misconception suggests that azelaic acid is unsuitable for pregnant individuals and nursing mothers, when dermatological literature actually identifies it as a pregnancy-safe skincare ingredient with minimal systemic absorption. Studies tracking systemic levels of azelaic acid in pregnant women using topical formulations found absorption levels below 5% of applied doses, with negligible amounts detected in breast milk. The American Academy of Dermatology recognizes azelaic acid as an appropriate treatment for pregnancy-related skin conditions including melasma and acne when applied topically at recommended concentrations. This safety profile distinguishes azelaic acid from retinoids and other common acne treatments that require discontinuation during pregnancy, making it a valuable option for treating skin concerns throughout pregnancy and postpartum periods.