# Retinol, Retinal, Tretinoin and Adapalene: How They Differ URL: https://dermalguide.com/articles/retinoids-compared/ Published: 2026-10-25 > Retinol vs retinal vs tretinoin vs adapalene: which are prescription, how close each is to the active form, what they're used for, and which one to start with. ## Short answer All four are retinoids, vitamin A relatives. Tretinoin is retinoic acid itself, the form skin uses, and is prescription only. Adapalene is a synthetic retinoid sold over the counter in the US for acne. Retinol and retinal (retinaldehyde) are cosmetic ingredients that skin converts to retinoic acid: retinal in one step, retinol in two, which is why they're milder. Retinyl esters such as retinyl palmitate are a step further back. Start with the gentlest one that matches your goal, and none of them is recommended during pregnancy. ## What this means for you ### Start with what you notice If you're choosing between a retinol serum, an adapalene gel and asking a doctor about tretinoin, the main differences are strength, what each is for, and whether you need a prescription. ### The ingredient names, translated Retinoids work by acting like retinoic acid in the skin. Tretinoin is retinoic acid, so it acts directly and is the strongest of the four. Retinal and retinol have to be converted by skin first, so less of the active form reaches its target, which makes them gentler and slower. Adapalene is a lab-designed retinoid used mainly for acne, available over the counter in the US. Stronger usually means more irritation, not just faster results. ### How to decide - Fine lines and texture, never used a retinoid? A low-strength retinol cream, every other night. - Clogged pores and acne? Adapalene gel is the over-the-counter retinoid made for acne; a dermatologist may suggest tretinoin. - Already use retinol comfortably and want a step up? Retinal products, or ask a dermatologist about tretinoin. - Pregnant, trying to conceive or breastfeeding? Skip retinoids and ask your doctor; see our pregnancy skincare guide. ### What to expect Every retinoid can cause dryness, redness and peeling at first, and DermNet notes improvement can take 12 weeks or longer. Percentages aren't comparable between different retinoids, and a higher number on a cosmetic label doesn't make it equivalent to a prescription. We haven't tested these products; facts come from each brand's label. General guidance, not a test of these products: [AAD: retinoid or retinol?](https://www.aad.org/public/everyday-care/skin-care-secrets/anti-aging/retinoid-retinol); [DermNet: topical retinoids](https://dermnetnz.org/topics/topical-retinoids); [AAD: dermatologist-approved pregnancy skin care](https://www.aad.org/public/everyday-care/skin-care-secrets/routine/pregnancy-skin-care); [Chemical stability of adapalene and tretinoin with benzoyl peroxide (Br J Dermatol, 1998)](https://pubmed.ncbi.nlm.nih.gov/9990414/). Each product's label source is linked on its product page. Retinol, retinal, tretinoin and adapalene are all retinoids, but they sit at different points on a ladder of strength. Tretinoin is retinoic acid itself and needs a prescription. Adapalene is a synthetic retinoid sold over the counter in the US for acne. Retinal and retinol are cosmetic ingredients the skin converts into retinoic acid, retinal in one step and retinol in two, which is why they're gentler and slower. The [AAD describes](https://www.aad.org/public/everyday-care/skin-care-secrets/anti-aging/retinoid-retinol) "retinoids" as a catch-all for vitamin A-based products used on skin. That's why labels and articles use the words loosely, and why "retinoid serum" on a bottle can mean almost anything from a retinyl ester to a blend of several forms. > **Skin Realist check:** the strongest retinoid is the one that irritates you most, not necessarily the one that helps you most. The best one is the one you can keep using. ## The retinoid ladder at a glance | Retinoid | How it works | Prescription? | Usually used for | | --- | --- | --- | --- | | Retinyl esters (retinyl palmitate) | Several conversion steps to retinoic acid | No | Gentle cosmetic formulas | | Retinol | Two steps: retinol → retinal → retinoic acid | No | Fine lines, texture, tone | | Retinal (retinaldehyde) | One step to retinoic acid | No | A step up from retinol | | Hydroxypinacolone retinoate | A retinoic acid ester used in cosmetics | No | Often blended with retinol | | Adapalene | Synthetic retinoid; acts directly | OTC in the US (0.1%); higher strengths by prescription | Acne | | Tretinoin | Retinoic acid itself | Yes | Acne, photoaging | | Tazarotene, trifarotene | Synthetic retinoids | Yes | Acne, psoriasis (tazarotene) | Conversion steps follow our [retinol guide](https://dermalguide.com/ingredients/retinol/). [DermNet lists](https://dermnetnz.org/topics/topical-retinoids) adapalene, tretinoin, tazarotene and trifarotene among prescription topical retinoids, and notes retinol and retinaldehyde are commonly added to cosmetics. ## Why does the number of conversion steps matter? Skin has to convert retinol and retinal into retinoic acid before they act like a retinoid. Each step means less of the active form reaches its target, which is part of why cosmetic retinoids are milder than prescriptions. It's also why a percentage on one type of retinoid can't be compared with another. A 1% retinol isn't "ten times" a 0.1% tretinoin; they're different molecules. Blends make this harder. A "3.5% retinoid complex", for example, tells you the brand's total for its blend, not how much of each retinoid is in it. Our [active strengths](https://dermalguide.com/active-strengths/) pages keep pure retinol percentages separate from complexes for that reason. ## Retinol: the usual starting point Retinol is the most common over-the-counter retinoid. [COSRX The Retinol 0.1 Cream](https://dermalguide.com/products/cosrx-the-retinol-0-1-cream/) is a low-strength example: a 20 mL cream with 0.1% retinol, plus panthenol, shea butter and vitamin E, sold as fragrance free. COSRX positions it for people beginning to address fine lines and texture. That fits the AAD's advice to start with the least intense formula you can find, every other night. **→ [Check price on Amazon](https://dermalguide.com/products/cosrx-the-retinol-0-1-cream/)** Our [retinol for beginners guide](https://dermalguide.com/articles/how-to-safely-introduce-retinol-into-your-routine/) and the [COSRX Retinol 0.1 vs 0.3 comparison](https://dermalguide.com/comparisons/cosrx-retinol-0-1-vs-0-3-cream/) go deeper. ## Retinal: one step closer Retinal (retinaldehyde) needs only one conversion step, so it's generally treated as a step up from retinol. We don't currently list a product with retinal as its main retinoid. If you're shopping for one, check that retinal or retinaldehyde appears on the ingredient list, not just in the product name. ## Retinoid blends and esters Many serums combine retinol with hydroxypinacolone retinoate, a retinoic acid ester used in cosmetics. [Sunday Riley A+ High-Dose Retinoid Serum](https://dermalguide.com/products/sunday-riley-a-high-dose-retinoid-serum/) lists hydroxypinacolone retinoate and retinol, and Sunday Riley sells it as fragrance free and for evening use. [Dermalogica Dynamic Skin Retinol Serum](https://dermalguide.com/products/dermalogica-dynamic-skin-retinol-serum/) lists the same two retinoids in what Dermalogica calls a 3.5% retinoid complex, along with several essential oils, including geranium and eucalyptus, and linalool. The [Dermalogica vs Sunday Riley A+ comparison](https://dermalguide.com/comparisons/dermalogica-dynamic-skin-retinol-vs-sunday-riley-a-plus/) sets them side by side. **→ [See Sunday Riley A+ on Amazon](https://dermalguide.com/products/sunday-riley-a-high-dose-retinoid-serum/)** ## Adapalene: the over-the-counter acne retinoid Adapalene is a synthetic retinoid made for acne. The [AAD notes](https://www.aad.org/public/everyday-care/skin-care-secrets/anti-aging/retinoid-retinol) it's available both by prescription and over the counter. It's a different tool from retinol: aimed at clogged pores and breakouts rather than fine lines, and applied as a thin layer to the whole acne-prone area, not just to spots. Adapalene also stays stable when combined with benzoyl peroxide, unlike tretinoin, according to a [1998 stability study](https://pubmed.ncbi.nlm.nih.gov/9990414/). Our [OTC acne treatments comparison](https://dermalguide.com/articles/otc-acne-treatments-compared/) covers adapalene alongside benzoyl peroxide, salicylic acid and azelaic acid. ## Tretinoin: the prescription standard Tretinoin is retinoic acid itself, the form the others are converted into. It's prescription only and used for acne and sun-damaged skin. Because it acts directly, it's more likely to cause dryness and peeling, which [DermNet](https://dermnetnz.org/topics/topical-retinoids) calls retinoid dermatitis. Our [prescription vs OTC acne guide](https://dermalguide.com/articles/prescription-vs-otc-acne-treatments/) explains what a dermatologist can add, and the [retinol peeling guide](https://dermalguide.com/articles/moisturizer-for-retinol-peeling/) covers moisturizing through it. > **Skin Realist check:** if you're comfortable on a cosmetic retinol and happy with your skin, there's no prize for climbing the ladder. ## Which retinoid should you start with? 1. **Goal is fine lines, texture or tone, and you've never used a retinoid:** a low-strength retinol, every other night. 2. **Goal is acne:** adapalene over the counter, or see a dermatologist for tretinoin or other options. 3. **You tolerate retinol well and want more:** a retinal product, or ask a dermatologist about tretinoin. 4. **Sensitive or eczema-prone skin:** start very slowly. DermNet notes retinoids can make eczema worse through drying. Bakuchiol is sometimes marketed as an alternative; see our [bakuchiol guide](https://dermalguide.com/ingredients/bakuchiol/). ## What about pregnancy? The [AAD lists](https://www.aad.org/public/everyday-care/skin-care-secrets/routine/pregnancy-skin-care) retinoids, including over-the-counter retinol, among ingredients not to use during pregnancy. That covers retinal and retinyl esters too, since they're all retinoids. [DermNet](https://dermnetnz.org/topics/topical-retinoids) notes some topical retinoids are contraindicated in pregnancy. If you're pregnant, trying to conceive or breastfeeding, ask your doctor or pharmacist, and see our [pregnancy skincare guide](https://dermalguide.com/articles/pregnancy-skincare-ingredients-to-avoid/). ## Mistakes to avoid - Comparing percentages across different retinoids. - Using two retinoid products in the same routine. - Starting nightly, at a high strength, alongside an exfoliating acid. - Assuming "retinoid" on a cosmetic label means a prescription-strength ingredient. - Skipping sunscreen. The AAD notes retinoids can increase sun sensitivity. ## The bottom line Tretinoin is the strongest and needs a prescription. Adapalene is the over-the-counter retinoid for acne. Retinal and retinol are gentler cosmetic options, with retinol the usual first step. If you only try one, make it a low-strength retinol such as [COSRX The Retinol 0.1 Cream](https://dermalguide.com/products/cosrx-the-retinol-0-1-cream/), every other night, under a moisturizer and with daily sunscreen. ## Sources - [AAD: retinoid or retinol?](https://www.aad.org/public/everyday-care/skin-care-secrets/anti-aging/retinoid-retinol): supports "retinoid" as a catch-all, adapalene being OTC and prescription, prescription retinoids such as tretinoin, starting with the least intense formula, and sun sensitivity. - [DermNet: topical retinoids](https://dermnetnz.org/topics/topical-retinoids): supports the list of prescription retinoids, retinol and retinaldehyde in cosmetics, retinoid dermatitis, eczema worsening, the 12-week timeline and pregnancy cautions. - [AAD: pregnancy skin care](https://www.aad.org/public/everyday-care/skin-care-secrets/routine/pregnancy-skin-care): supports avoiding retinoids, including retinol, during pregnancy. - [Br J Dermatol 1998: adapalene and tretinoin stability with benzoyl peroxide](https://pubmed.ncbi.nlm.nih.gov/9990414/): supports adapalene's stability with benzoyl peroxide. Conversion steps come from our retinol ingredient guide and its sources. ## Frequently asked questions ### Is retinal stronger than retinol? Retinal (retinaldehyde) is one conversion step closer to retinoic acid than retinol, so it's generally considered the stronger of the two cosmetic forms. Formula, strength and delivery matter too, so compare products, not just names. ### Is adapalene a retinol? No. Both are retinoids, but adapalene is a synthetic retinoid designed for acne. It's sold over the counter in the US as well as by prescription, while retinol is a cosmetic ingredient. ### Is tretinoin the same as retinol? No. Tretinoin is retinoic acid, the active form, and needs a prescription. Retinol is converted to retinoic acid in the skin, which makes it milder and slower. ### Which retinoid should a beginner start with? The AAD's advice is the least intense formula you can find, every other night. For most people that's a low-strength retinol. For acne, adapalene is the over-the-counter option. ### Can I use retinoids while pregnant? Dermatologists advise not using retinoids, including over-the-counter retinol, during pregnancy. Ask your doctor or pharmacist if you're pregnant, trying to conceive or breastfeeding. Amazon links on this site are affiliate links. This is general information, not medical advice.