Adapalene vs tretinoin vs retinol: which retinoid fits your skin?

Adapalene, tretinoin and retinol are all retinoids, but they are not interchangeable. Tretinoin is retinoic acid, the active form of vitamin A, and the most studied option for photoageing, adapalene is a synthetic retinoid designed mainly for acne and tends to be gentler, and retinol is a cosmetic ingredient that the skin has to convert before it works, so it is milder and slower.

Which one makes sense depends on what you want to treat (acne, fine lines, uneven tone), how sensitive your skin is, and whether you are pregnant or planning a pregnancy. Two of the three are prescription medicines in Spain, so for those a doctor reviews your case and decides whether they are appropriate.

Key takeaways

- Retinol is converted in the skin to retinaldehyde and then retinoic acid; tretinoin is retinoic acid itself; adapalene is a synthetic retinoid that targets specific receptors [1][2].

- For acne, a meta-analysis of five randomised trials found adapalene 0.1% gel as effective as tretinoin 0.025% gel, with better tolerability [5].

- For photoageing, tretinoin remains the reference treatment, though it is the most irritating of the three [9][14].

- Tretinoin and adapalene are prescription medicines in Spain; retinol is a cosmetic ingredient with EU concentration limits [3][4][10].

- Topical tretinoin and adapalene are contraindicated in pregnancy and in women planning a pregnancy [3][4].

How each retinoid works

All three act, directly or indirectly, through retinoic acid receptors (RARs) in the nucleus of skin cells. Those receptors switch on genes that speed up cell turnover, normalise how skin cells shed inside the pore and support collagen production [1].

Retinol: a precursor that needs converting

Retinol is a natural form of vitamin A. Once applied, skin enzymes convert it to retinaldehyde and then to retinoic acid, the form that binds the receptors [1]. Because this conversion is limited and controlled, retinol reaches the receptors in smaller amounts, which explains both its gentler profile and its more modest effect [1].

Tretinoin: the active molecule itself

Tretinoin is all-trans retinoic acid, so it needs no conversion. It increases turnover of epidermal cells and makes the outer layer less cohesive, which helps clear existing comedones and may prevent new ones [4]. It is considered possibly the most potent topical retinoid for photoageing and certainly the most investigated [14].

Adapalene: a synthetic, receptor-selective retinoid

Adapalene is a stable synthetic molecule (a naphthoic acid derivative) whose retinoid activity is mediated by RAR beta and RAR gamma [2]. Unlike tretinoin, it does not bind the cytosolic retinoic acid binding proteins, and it is chemically stable in the presence of light and oxygen [3]. It also has anti-inflammatory effects in laboratory and clinical studies, which is useful for red, inflamed acne spots [3].

Strength and potency: is stronger better?

Potency is not the same as being the right choice. A stronger retinoid can produce faster or larger changes, but it also tends to cause more dryness, peeling and stinging, and poor tolerability is what most often limits its use [9][14].

	Retinol	Adapalene	Tretinoin
What it is	Vitamin A, a precursor	Synthetic retinoid	All-trans retinoic acid
Needs conversion in skin	Yes, two steps [1]	No [2]	No [4]
Receptor action	Indirect, after conversion	Mainly RAR beta and gamma [2]	Binds RARs directly
Main evidence	Fine wrinkles, mostly small studies [7][13]	Acne; some photoageing data [5][8]	Acne and photoageing [5][9]
Irritation	Lowest [1][14]	Moderate, usually less than tretinoin [5]	Highest of the three [9][14]
Status in Spain	Cosmetic ingredient, EU limits [10]	Prescription medicine [3]	Prescription medicine [4]
Pregnancy	Ask a doctor; label warning on vitamin A [10]	Contraindicated [3]	Contraindicated [4]

In Spain, tretinoin creams are authorised at 0.025%, 0.05% and 0.1%, and the product information advises starting with a low concentration once a day before adjusting [4]. Adapalene is authorised for acne as a 0.1% gel [3]. Cosmetic retinol for the face is capped at 0.3% retinol equivalent in the EU [10].

What the evidence says for acne

Acne is where adapalene and tretinoin have been compared most directly.

• Head-to-head trials. A meta-analysis of five multicentre, investigator-blinded randomised trials pooled 900 patients with mild to moderate acne. Adapalene 0.1% gel was equivalent to tretinoin 0.025% gel in reducing total lesions, worked faster on inflammatory and total lesions at week 1, and was better tolerated at every visit [5].
• Network meta-analysis. A network meta-analysis of 35 randomised trials with 33,472 participants found no significant difference among most single topical agents for lesion count reduction, and combination products were generally the most effective [6].
• Guidelines. The American Academy of Dermatology's 2024 guideline gives a strong recommendation for topical retinoids and for benzoyl peroxide, and advises combining treatments with different mechanisms [12].

Retinol is not an acne treatment in the medical sense: it has not been tested in trials comparable to these, so it is not a substitute when acne needs treatment. If you want to read about the combined approach, see our guide to adapalene with benzoyl peroxide and the overview of acne treatment options.

What the evidence says for photoageing

For fine lines, rough texture and sun spots, the evidence ranks differently.

• Tretinoin is still called the gold standard. A 2024 systematic review of 25 studies comparing other topicals with tretinoin found that comparators were often less irritating, but most studies were of poor quality or at risk of bias, so no alternative has been shown to replace it as first line [9].
• Adapalene 0.3%. In a randomised, investigator-blinded trial in Brazil, adapalene 0.3% gel was non-inferior to tretinoin 0.05% cream over 24 weeks for global photoageing, periorbital and forehead wrinkles and pigment spots, with a similar safety profile [8]. In Spain adapalene is authorised for acne [3], so this use relies on that trial rather than on an approved indication.
• Retinol. In a randomised, double-blind trial in 36 older adults (mean age 87), 0.4% retinol lotion applied to one arm for 24 weeks improved fine wrinkling scores by 1.64 points on a 0 to 9 scale, against 0.08 for the vehicle [7]. Another study found retinol produced the same kind of changes in skin structure and collagen genes as retinoic acid, but the magnitude tended to be smaller [13]. Note that the Kafi trial used a concentration above the 0.3% retinol-equivalent ceiling now set for EU face products [7][10].

For a fuller picture of what helps ageing skin, read our article on evidence-based treatments for skin ageing and the page on anti-ageing treatment.

Irritation and how to reduce it

Retinoid irritation usually means redness, dryness, flaking and stinging in the first weeks. The tretinoin product information notes that an apparent flare can occur early on and that irritation settles when applications are spaced out [4].

• Retinol and retinaldehyde are considerably less irritating than tretinoin [14], and retinol is described as non-irritant with modest clinical effect [1].
• Adapalene was better tolerated than tretinoin 0.025% at every visit in the pooled acne trials [5].
• Tretinoin is the most irritating of the three, and poor tolerability often limits its use [9][14].

What the product information describes (the doctor who prescribes it decides how you use it):

1. Treatment usually starts with a low strength, once a day [4].
2. A thin layer goes on dry skin, away from the eyes, mouth, nostrils and mucous membranes [3][4].
3. It is not applied on broken, sunburnt or eczematous skin [3].
4. If irritation is significant, the doctor may advise applying it less often or pausing until it settles [3].
5. A moisturiser, daily sunscreen and protective clothing are recommended [3][4].

Our beginner's guide to tretinoin goes through a gradual start step by step.

Regulatory status: prescription or cosmetic?

Their legal status differs, and it also varies by country.

• Tretinoin is a prescription-only medicine in Spain [4].
• Adapalene is a prescription medicine in Spain according to the AEMPS product information [3]. In the United States, the FDA approved adapalene 0.1% gel for over-the-counter use in people aged 12 and over in 2016, the first retinoid made available without prescription there for acne [11].
• Retinol is a cosmetic ingredient. Commission Regulation (EU) 2024/996 added retinol, retinyl acetate and retinyl palmitate to Annex III of the Cosmetics Regulation, with a maximum of 0.05% retinol equivalent in body lotion and 0.3% in other leave-on and rinse-off products, plus the mandatory label "Contains Vitamin A. Consider your daily intake before use" [10]. Non-compliant products may not be placed on the EU market from 1 November 2025, nor made available from 1 May 2027 [10].

Which one suits whom?

There is no single best retinoid. These are general patterns, not individual advice.

• Retinol may suit people with mild early signs of ageing, very sensitive skin, or those who want to build tolerance with a cosmetic product before considering a medicine.
• Adapalene is a well-tolerated option for mild to moderate comedonal and inflammatory acne. Guidelines strongly recommend topical retinoids for acne and favour combining them with other mechanisms such as benzoyl peroxide [5][12].
• Tretinoin suits people with acne or with established photoageing who can tolerate a stronger retinoid and want the option with the most evidence for fine lines and texture [9]. See our tretinoin guide for details on how it is used.

Pregnancy, breastfeeding and sun safety

Retinoids need extra care around pregnancy.

• Tretinoin and adapalene are contraindicated in pregnancy and in women planning a pregnancy; if pregnancy occurs during treatment, contact your doctor straight away: the labels say treatment must be stopped [3][4].
• A 2015 meta-analysis of 654 pregnancies exposed to topical retinoids found no significant increase in major congenital malformations (odds ratio 1.22, 95% CI 0.65 to 2.29) [15]. The labelled contraindication still applies, so this finding is reassuring for accidental exposure, not a reason to use them in pregnancy.
• Breastfeeding: a doctor assesses each case. The labels say adapalene may be used avoiding the chest [3], and tretinoin only if the benefit justifies the possible risk [4].
• Retinol: EU law requires a vitamin A intake warning on every retinol product [10]. If you are pregnant or trying to conceive, ask a doctor or pharmacist before using it.
• Sun: avoid excessive sun and UV lamps, and use sunscreen daily; tretinoin should not be combined with photosensitising medicines [3][4].

When to see a doctor

See a doctor, or a dermatologist in person, if:

• your acne is severe, leaves scars, includes deep painful nodules, or affects large areas of your body;
• irritation is intense, blisters, swells or does not settle when you reduce use;
• you develop a rash that might be an allergic reaction;
• you are pregnant, planning a pregnancy or breastfeeding and are unsure what is safe;
• a spot or mole is changing, bleeding or not healing, which needs an in-person check;
• topical treatment has not helped after a fair trial and oral options such as isotretinoin may need discussing. Those are assessed by a dermatologist in person, as Hi Doctor offers topical skin treatments only.

Sources

1. Sorg O, Antille C, Kaya G, Saurat JH. Retinoids in cosmeceuticals. Dermatol Ther. 2006;19(5):289-96. DOI: 10.1111/j.1529-8019.2006.00086.x. https://pubmed.ncbi.nlm.nih.gov/17014484/
2. Shroot B, Michel S. Pharmacology and chemistry of adapalene. J Am Acad Dermatol. 1997;36(6 Pt 2):S96-103. DOI: 10.1016/s0190-9622(97)70050-1. https://pubmed.ncbi.nlm.nih.gov/9204085/
3. AEMPS, CIMA. Ficha técnica: adapaleno 1 mg/g gel (nregistro 61066). Medicamento sujeto a prescripción médica. https://cima.aemps.es/cima/dochtml/ft/61066/FT_61066.html
4. AEMPS, CIMA. Ficha técnica: tretinoína 0,25 mg/g crema (nregistro 60140). Medicamento sujeto a prescripción médica. https://cima.aemps.es/cima/dochtml/ft/60140/FT_60140.html
5. Cunliffe WJ, Poncet M, Loesche C, Verschoore M. A comparison of the efficacy and tolerability of adapalene 0.1% gel versus tretinoin 0.025% gel in patients with acne vulgaris: a meta-analysis of five randomized trials. Br J Dermatol. 1998;139 Suppl 52:48-56. DOI: 10.1046/j.1365-2133.1998.1390s2048.x. https://pubmed.ncbi.nlm.nih.gov/9990421/
6. Kakpovbia EE, Young T, Milam EC, et al. Efficacy of topical treatments for mild-to-moderate acne: a systematic review and meta-analysis of randomized control trials. J Eur Acad Dermatol Venereol. 2025;39(4):775-784. DOI: 10.1111/jdv.20154. https://pubmed.ncbi.nlm.nih.gov/38943431/
7. Kafi R, Kwak HS, Schumacher WE, et al. Improvement of naturally aged skin with vitamin A (retinol). Arch Dermatol. 2007;143(5):606-12. DOI: 10.1001/archderm.143.5.606. https://pubmed.ncbi.nlm.nih.gov/17515510/
8. Bagatin E, Gonçalves HS, Sato M, Almeida LMC, Miot HA. Comparable efficacy of adapalene 0.3% gel and tretinoin 0.05% cream as treatment for cutaneous photoaging. Eur J Dermatol. 2018;28(3):343-350. DOI: 10.1684/ejd.2018.3320. https://pubmed.ncbi.nlm.nih.gov/30105991/
9. Siddiqui Z, Zufall A, Nash M, Rao D, Hirani R, Russo M. Comparing tretinoin to other topical therapies in the treatment of skin photoaging: a systematic review. Am J Clin Dermatol. 2024;25(6):873-890. DOI: 10.1007/s40257-024-00893-w. https://pubmed.ncbi.nlm.nih.gov/39348007/
10. Commission Regulation (EU) 2024/996 of 3 April 2024 amending Regulation (EC) No 1223/2009 as regards the use of Vitamin A, Alpha-Arbutin and Arbutin and certain substances with potential endocrine disrupting properties in cosmetic products. OJ L, 2024/996, 4.4.2024. https://eur-lex.europa.eu/eli/reg/2024/996/oj
11. US Food and Drug Administration (Office of Pediatric Therapeutics; Division of Nonprescription Drug Products). Topical retinoid acne treatment approved for OTC use. AAP News, 2016. https://www.fda.gov/files/science%20&%20research/published/Topical-retinoid-acne-treatment-approved-for-OTC-use.pdf
12. Reynolds RV, Yeung H, Cheng CE, et al. Guidelines of care for the management of acne vulgaris. J Am Acad Dermatol. 2024;90(5):1006.e1-1006.e30. DOI: 10.1016/j.jaad.2023.12.017. https://pubmed.ncbi.nlm.nih.gov/38300170/
13. Kong R, Cui Y, Fisher GJ, et al. A comparative study of the effects of retinol and retinoic acid on histological, molecular, and clinical properties of human skin. J Cosmet Dermatol. 2016;15(1):49-57. DOI: 10.1111/jocd.12193. https://pubmed.ncbi.nlm.nih.gov/26578346/
14. Mukherjee S, Date A, Patravale V, Korting HC, Roeder A, Weindl G. Retinoids in the treatment of skin aging: an overview of clinical efficacy and safety. Clin Interv Aging. 2006;1(4):327-48. DOI: 10.2147/ciia.2006.1.4.327. https://pubmed.ncbi.nlm.nih.gov/18046911/
15. Kaplan YC, Ozsarfati J, Etwel F, Nickel C, Nulman I, Koren G. Pregnancy outcomes following first-trimester exposure to topical retinoids: a systematic review and meta-analysis. Br J Dermatol. 2015;173(5):1132-41. DOI: 10.1111/bjd.14053. https://pubmed.ncbi.nlm.nih.gov/26215715/