Adapalene

📋 Quick facts

Description: Adapalene — acne treatment, retinoid.

All Functions: acne treatment, retinoid

Quick Facts:

• Category: active
• Also Known As: Differin
• Comedogenic Rating: 0/5

Proven Benefits At A Glance:

• Adapalene is a topical retinoid (vitamin A derivative) FDA-approved for treating acne
• It works by controlling cell proliferation and differentiation, and has anti-inflammatory properties
• When used topically, it’s poorly absorbed into the bloodstream—blood levels stay below 0.25 mcg/L even with long-term use
• Common mild-to-moderate side effects early on include redness, dryness, itching, and stinging
• It’s effective as a single treatment for mild comedonal acne, and works better for moderate acne when combined with benzoyl peroxide
• It has potential off-label uses beyond acne, though these are less established

⚗️ Chemical Overview

Adapalene is a naphthoic acid that is CD437 in which the phenolic hydroxy group has been converted to its methyl ether. It has a role as a non-steroidal anti-inflammatory drug, a dermatologic drug and an EC 2.7.11.22 (cyclin-dependent kinase) inhibitor. It is a monocarboxylic acid, a naphthoic acid and a member of adamantanes. It is functionally related to a CD437. Acne vulgaris is a multifactorial disorder of the pilosebaceous unit involving increased sebum production, inflammation, and hyperproliferation/hyperkeratinization of the follicular infundibulum. It is also associated with Cutibacterium acnes (also known as Propionibacterium acnes). Adapalene is a third-generation topical retinoid used for the treatment of acne vulgaris. Adapalene has similar efficacy but a superior safety profile compared to tretinoin. [Tazarotene] is more efficacious than adapalene but is designated as pregnancy category X and hence is contraindicated in pregnant women. Adapalene can also be combined with benzoyl peroxide (BPO), which possesses bactericidal properties, and either adapalene alone, or adapalene BPO combination products, are commonly used to treat mild-to-severe acne. Differin®, produced by Galderma Labs, was first granted FDA approval on May 31st, 1996, as a 0.1% adapalene topical solution. Differin was later made available as 0.1% gel, cream, or lotion, or 0.3% gel products. On December 8th, 2008, Galderma Labs gained FDA approval for Epiduo®, a 0.1% adapalene, 2.5% BPO combination gel. Adapalene is a Retinoid.

Source(s): DrugBank, FDA Pharm Classes, ChEBI, via PubChem

📊 Comedogenicity

0/5

🛡️ Safety rating

Safety tier is a starting heuristic from regulatory status and comedogenic rating, not a dermatological verdict — see our Terms for the full disclaimer. Research confidence reflects how many real cited studies back this ingredient, not the strength of their findings.

🤰 Pregnancy Safety Note

Synthetic retinoid. Animal studies show teratogenic potential. Avoid during pregnancy.

🌍 Regulatory Status

💧 Skin Type Compatibility

Derived from this ingredient’s irritancy potential and comedogenicity rating against the needs of each skin type — e.g. oily and acne-prone skin are marked down for pore-clogging ingredients, sensitive skin for irritants. A starting heuristic, not a dermatological verdict.

⚠️ Don’t Combine With

📚 Research & Evidence

🔬 The Science

Adapalene is classified as a retinoid, meaning it’s a derivative of vitamin A that works on your skin at a molecular level. Unlike some other retinoids, adapalene is a naphthoic acid derivative—a specific chemical structure that gives it distinct properties. Here’s how it tackles acne: #1: It controls how skin cells grow and shed, which helps prevent the buildup of dead skin cells that clogs pores (Expert Opin Drug Metab Toxicol, 2009; J Am Acad Dermatol, 1997). #2: It actively pushes out existing comedones—the clogged pores that form blackheads and whiteheads (Expert Opin Drug Metab Toxicol, 2009). #3: It has anti-inflammatory effects that calm irritated skin (J Am Acad Dermatol, 1997; Expert Opin Drug Metab Toxicol, 2009).

At the cellular level, adapalene binds to specific receptors called RAR beta and RAR gamma, which are proteins that control gene activity related to skin health (J Am Acad Dermatol, 1997). For acne treatment specifically, adapalene works best as a solo treatment for mild comedonal acne, and becomes significantly more effective when paired with benzoyl peroxide for mild-to-moderate inflammatory acne (Expert Opin Drug Metab Toxicol, 2009). Research has also shown that combining adapalene with both benzoyl peroxide and clindamycin (an antibiotic) in a single product produced superior results compared to any two-ingredient combination or single ingredient alone in a 12-week study of over 700 participants with moderate-to-severe acne (Am J Clin Dermatol, 2022).

Beyond acne, adapalene has potential off-label applications including treatment of verrucae, molluscum contagiosum, photoaging, pigmentary disorders, actinic keratoses, and alopecia areata, though the research supporting these uses is less comprehensive (a peer-reviewed journal, 2026). Regarding safety: topical adapalene is poorly absorbed through the skin. Even with long-term daily use, blood levels remain below 0.25 mcg/L, suggesting minimal systemic exposure (a peer-reviewed journal, 2006). Side effects are typically mild-to-moderate and occur early in treatment, including erythema (redness), xerosis (dryness), itching, and stinging (Expert Opin Drug Metab Toxicol, 2009). For breastfeeding individuals, while adapalene hasn’t been formally studied in this population, the poor absorption means it’s considered probably low-risk to nursing infants if applied to the smallest surface area possible, for the shortest duration, and never on the nipple area (a peer-reviewed journal, 2006).

📄 Related Research

Matched by search — not necessarily verified support for every statement above.

• Unknown authors (2006). Adapalene. a peer-reviewed journal.
• Tolaymat L et al. (2026). Adapalene. a peer-reviewed journal.
• Stein Gold L et al. (2022). Efficacy and Safety of a Fixed-Dose Clindamycin Phosphate 1.2%, Benzoyl Peroxide 3.1%, and Adapalene 0.15% Gel for Moderate-to-Severe Acne: A Randomized Phase II Study of the First Triple-Combination Drug. Am J Clin Dermatol.
• Piérard GE et al. (2009). Spotlight on adapalene. Expert Opin Drug Metab Toxicol.
• Shroot B et al. (1997). Pharmacology and chemistry of adapalene. J Am Acad Dermatol.

📰 Recent News

• Pediatric Genital Endemic Kaposi Sarcoma with Partial Response to Adapalene (PubMed)
• Efficacy and Safety of Clascoterone Cream 1% and Adapalene Gel 0.3% in Patients With Acne (PubMed)

🧴 Products Containing Adapalene