The Definitive Guide to Tretinoin

Tretinoin (also known by the brand name Retin-A) is a prescription-strength form of vitamin A and one of the most researched and effective skincare ingredients available. It is a topical treatment popular for clearing acne, fading hyperpigmentation and treating melasma, and softening fine lines and wrinkles. In the UK, tretinoin is prescription-only which means you can only get it through a doctor or other medical prescriber. This guide covers what tretinoin is, what it treats, the different strengths and formulations, how to use it safely, its side effects and how to get it in the UK.

What is Tretinoin (Retin-A)?

At their core, retinoids are derivatives of vitamin A, and tretinoin is one of the most potent topical forms available. It works on the skin in three main ways: it speeds up skin cell turnover, stimulates collagen production and improves blood flow to the skin. This combination is what makes it effective across such a wide range of concerns, from acne to skin ageing.

Tretinoin comes as a cream or a gel in several strengths, most commonly 0.025%, 0.05% and 0.1%. It was first discovered in the late 1950s and its effects on skin were further investigated throughout the 1960s. The FDA first approved it, under the brand name Retin-A, for acne in the 1970s. Its anti-ageing effects were discovered in the 1980s after studies showed it improved fine lines and pigmentation. Decades of research have since confirmed its role across acne, hyperpigmentation and skin ageing, and a review of 40 years of topical tretinoin use found a consistently strong safety and efficacy record. This depth of evidence is why tretinoin remains the benchmark against which newer retinoids are measured.

What Does Tretinoin Treat?

Broadly speaking, tretinoin is a genuine all-rounder, which is rare in skincare. Although it is only licensed for treating acne, it is often used off-license by doctors for a wide range of skin concerns including:

• Acne: Tretinoin unclogs pores and reduces inflammation, which both clears existing breakouts and prevents new ones. It is often a first-line topical treatment for moderate acne, usually alongside other actives. Tretinoin also helps with the different types of acne and reduces the risk of acne scarring and post acne dark marks.
• Hyperpigmentation & melasma: By accelerating cell turnover, tretinoin can help fade hyperpigmentation due to sun spots, melasma and post-inflammatory hyperpigmentation. Most doctors usually combine tretinoin with pigment suppressors like hydroquinone to even out skin tone.
• Fine lines, wrinkles and skin ageing: Tretinoin stimulates skin cells to make collagen. This can help soften fine lines and wrinkles as well as improve the firmness of ageing skin.
• Skin texture and tone: Even outside these specific conditions, regular use can help refine pores, texture and smooth roughness. It can also give the skin a brighter more radiant overall appearance.

At City Skin Clinic, tretinoin is one of the ingredients we prescribe most often where appropriate. It forms the backbone of many of our acne, hyperpigmentation, melasma and anti-ageing treatments. We normally use it as part of a bespoke compounded formula designed around each individual patient’s needs. If you are considering treatment, checkout this guide on where to get tretinoin in the UK and what to expect from each type of provider.

Tretinoin for Hair & Beard Growth

Beyond skin, tretinoin has a useful role in treating hair loss and supporting beard growth, though not as a standalone treatment. Its main value here is as an adjunct that improves how well other active ingredients work. When combined with topical minoxidil, tretinoin increases its absorption into the scalp and may enhance its effect on the hair follicles. Studies on combined tretinoin and minoxidil formulas have shown better results than minoxidil alone in some people. Tretinoin is thought to work by normalising the way skin cells turn over around the follicle and improving penetration of the active ingredients applied alongside it.

This is why we sometimes include tretinoin in our custom hair loss and beard growth serums, compounded together with ingredients like minoxidil, melatonin and caffeine. Where appropriate, we sometimes combine it with spironolactone, finasteride or dutasteride for hair loss. As with any use of tretinoin, using it for hair growth should always be under the guidance of a doctor or other suitable medical professional.

Tretinoin Strengths and Formulations

Tretinoin is available as a cream or gel which both deliver the same active ingredient. The only reason the base matters is whether you have a more dry or oily skin types:

• Tretinoin cream: This suits most people and is the better choice for dry or sensitive skin. The cream base provides more moisture and tends to cause less irritation.
• Tretinoin gel: These bases usually better suit very oily skin. They may also be more appropriate for anyone allergic to one of the ingredients in the cream formula.

When it comes to the product itself, there are three different forms all of which are equally effective. Tretinoin is available as generic, branded or compounded treatments:

• Generic: This is an off-the-shelf prescription treatment usually in just cream form. The active ingredient is identical to the branded versions and it is just as effective as them but maybe cheaper.
• Branded: Retin-A, Retirides or Obagi are off-the-shelf prescription brands of Tretinoin that usually come in cream form although Obagi has also a gel form in the 0.05% strength. These tend to be more popular than generics thanks to name recognition and reputation. Some brands use more advanced formulations which they claim are more stable or penetrate the skin better. In theory this can mean fewer side effects, but the results are the same because the active and strength are the same.
• Compounded: These formulations are custom-made for each patient by a specialist compounding pharmacy based on a doctor’s prescription. They contain the same active but allows an enormous amount of customisation in terms of strengths, bases and additional active ingredients. This means your doctor can prescribe strengths not available over the counter and add complementary actives like antibiotics or hydroquinone. They can also choose a cream or gel base matched to your skin type and sensitivity.

It’s worth noting that compounded treatments are unlicensed and are made individually for each patient. They require experienced prescribers who can truly fine tune the protocol to each patient. In our experience, compounding is what makes tretinoin work for the widest range of people. This is because it can tailor the formula to meet each individual patient’s needs.

Tretinoin Combinations & Compatible Actives

Usually people start tretinoin on its own as this is the simplest way to assess how your skin responds and to adjust the strength as you go. However, for more complex needs, it is also frequently combined with other actives to target specific concerns. This is either in a single compounded formula or as separate products used together. Below are the most commonly prescribed licensed off-the-shelf combined tretinoin products:

• Tri-Luma: Contains tretinoin 0.05%, hydroquinone 4% and fluocinolone acetonide 0.01%. Its main use is to treat melasma and hyperpigmentation. The tretinoin drives cell turnover, the hydroquinone lightens pigment, and the mild corticosteroid reduces inflammation. Possible side effects include redness, peeling, burning, dryness and itching. Overuse of hydroquinone can also cause ochronosis (a paradoxical darkening of the skin) whilst long-term use of the corticosteroid can thin the skin. In the UK Pigmanorm is the equivalent product which contains tretinoin 0.05% or 0.1%, hydroquinone 5% and hydrocortisone instead of fluocinolone steroid.
• Ziana, Veltin or Treclin: Ziana and Veltin (tretinoin 0.025% with clindamycin 1.2%) and Treclin (tretinoin 0.025% with clindamycin 1%) are mainly for acne. The clindamycin fights acne-causing bacteria while the tretinoin unclogs pores and reduces inflammation. Side effects can include dryness, redness, burning or itching, and long-term clindamycin use carries a risk of antibiotic resistance.
• Solage: Contains tretinoin 0.01% and mequinol 2%. Its main use is to treat solar lentigines (age spots or liver spots). The mequinol lightens pigment and the tretinoin boosts turnover, making it effective for these forms of hyperpigmentation. Side effects may include burning, itching, dryness, redness and increased sun sensitivity.

In the UK, tretinoin is usually prescribed as a standalone product in either 0.025%, 0.05% or 0.1% strengths. Some of the commercial combination brands above (except Treclin and Pigmanorm) are not available here due to UK and EU regulations. That said, a doctor experienced in compounded medicines can prescribe equivalent combinations where single-ingredient treatment is not working. A specialist compounding pharmacy will then formulate the cream.

In addition to combination and compounded formulas, there are a number of actives that are commonly combined with or used alongside tretinoin. Popular pairings include:

• Tretinoin and hydroquinone: A highly effective pairing for hyperpigmentation and melasma that fades dark patches and evens skin tone. We use this combination across our anti-ageing, melasma and hyperpigmentation treatments. It can also help with acne, acne scars and post-inflammatory hyperpigmentation.
• Tretinoin & benzoyl peroxide: This is effective for acne, as benzoyl peroxide kills acne-causing bacteria while tretinoin unclogs pores and calms inflammation. The two are not usually combined in one formula. We usually recommend using tretinoin at night and benzoyl peroxide in the morning or leaving a gap between applying them.
• Tretinoin & niacinamide: Niacinamide (vitamin B3) improves the skin barrier, reduces inflammation and helps with hyperpigmentation. Pairing it with tretinoin targets acne, ageing and hyperpigmentation while supporting skin health. It is available in single compounded formulas or as separate products.
• Tretinoin & azelaic acid: A strong combination for acne, hyperpigmentation and wrinkles. Azelaic acid reduces inflammation, kills acne-causing bacteria and lightens pigment. Tretinoin exfoliates at the cellular level and increases collagen production to help smooth texture, brighten skin and treat skin aging. Both can irritate the skin, so you should introduce them carefully under medical guidance. It is usually best to start slow and build up frequency then strength.

How to Use Tretinoin

Like any topical treatment, tretinoin rewards patience and consistency. It is worth the effort but it absolutely will not deliver overnight results. Your prescriber will provide you with the best protocol instructions for your skin but in general the basic routine usually involves:

• Cleanse: Use a gentle, hydrating cleanser to remove dirt and make-up. Thoroughly dry your skin.
• Apply tretinoin: Only use a pea-sized amount for the whole face. Dab it on the forehead, cheeks, nose and chin, then spread it evenly.
• Moisturise: Once the tretinoin has fully absorbed, apply a hydrating moisturiser to reduce dryness and peeling. Some people prefer to apply moisturiser before tretinoin to buffer it, which is fine.
• Use sunscreen every morning: Tretinoin makes the skin more sensitive to UV, so a daily broad-spectrum sunscreen with at least SPF 30 is non-negotiable. Even indoors or on cloudy days.

The single most important rule is to start slowly and on the lowest strength possible. Most people begin with tretinoin two to three times a week and build up the frequency as the skin adjusts. Going in too hard, too fast is the usual cause of irritation that puts people off. In terms of timing, you might see initial improvements in acne or hyperpigmentation after 6-8 weeks of consistent use. More significant changes, such as softer fine lines and better texture, can take at least 3-6 months of regular use. So, tretinoin is a long game and the results build the longer you use it.

Side Effects & the Tretinoin Purge

Tretinoin is powerful, and most people experience some side effects, particularly in the first few weeks. The tretinoin purge is the most talked-about. When you start tretinoin, it speeds up cell turnover and can bring underlying spots to the surface faster. This causes a temporary increase in breakouts or irritation. This skin purging is normal and usually settles within 4-6 weeks. It is not a sign the treatment is failing. Your prescriber may adjust your application technique or frequency during this period to help you through it more comfortably.

True common side effects of tretinoin use include redness, dryness, peeling and increased sun sensitivity. These are manageable with a gentle cleanser, a good moisturiser and daily sunscreen. They tend to ease as your skin builds tolerance. Allergic reactions are rare but possible and very serious. That’s why it is important to patch test any new product and to contact your prescriber promptly if you suspect an allergy or experience a side effect that does not settle.

Who Can & Cannot Use Tretinoin?

Tretinoin offers significant benefits, but it is not suitable for everyone. Some situations call for extra caution when considering tretinoin such as:

• Pregnancy & breastfeeding: Retinoids are not recommended in pregnancy or for anyone planning to become pregnant, due to potential risks to the baby. It is also best to avoid it while breastfeeding, as some tretinoin may pass into the breast milk. If you are pregnant, checkout our pregnancy skincare guidance for safer alternatives.
• Sensitive skin, eczema or rosacea: People with very sensitive skin, eczema or rosacea may find tretinoin too irritating. It is still possible to use it in some cases, but the strength, formulation and frequency usually need adjusting. As always medical guidance really matters.
• Sunburn or broken skin: You must not apply tretinoin to sunburnt skin, open wounds or an active eczema flare.

There are also certain medications and treatments that can negatively interact with tretinoin. Tell your prescriber if you are on any medications or having any treatment especially the below:

• Tetracycline antibiotics (such as lymecycline): Using these alongside tretinoin can rarely raise the risk of increased pressure around the brain (pseudotumor cerebri). This condition is benign but serious.
• Topical products with resorcinol, sulfur or salicylic acid: These can compound dryness and irritation.
• Photosensitising medications: Some drugs, including certain antibiotics, increase sun sensitivity. Alongside tretinoin, this can increase the risk of UV damage and burning.
• Hair removal: Waxing, chemical depilatories and laser hair removal can irritate skin that is already sensitised by tretinoin.

Being open about every medication, supplement and skincare product you use lets your prescriber design the safest, most effective approach for you.

Tretinoin vs Other Retinoids

Tretinoin is one of several retinoids. Here’s how tretinoin compares with the most popular over the counter and prescription retinoids:

• Tretinoin vs retinol: Retinol is available over the counter and is gentler, but it is also considerably weaker. This is because the skin has to convert it into active retinoic acid in several steps. Tretinoin is already in its active form, which makes it faster and more effective but potentially more irritating.
• Tretinoin vs adapalene: Adapalene is another prescription retinoid that is often better tolerated, which can make it a good option for sensitive or acne-prone skin.
• Retinaldehyde: This sits between retinol and tretinoin in strength and is a useful middle option for those who find tretinoin too strong but want more than retinol. It is available over the counter.

Each retinoid has its place, and the right choice depends on your skin, your concern and how much irritation you can tolerate.

How to Get Tretinoin in the UK

In the UK, tretinoin is a prescription-only medicine because it can cause side effects like inflammation, hyperpigmentation and burns without appropriate use. It is also not suitable during pregnancy, breast feeding and alongside certain medicines. You cannot buy it over the counter, and any website or clinic selling it without a consultation is not a legitimate source. To use it safely and legally, you need a prescription from a doctor or other qualified prescriber who has assessed your skin and decided it is appropriate for you.

Historically this meant an in-person appointment with a dermatologist or aesthetic doctor. Now you can get tretinoin online in the UK through a small number of online skin clinics and subscription services. These are often faster, cheaper and more convenient that in person clinics but keep the medical oversight that prescription medicines require. At City Skin Clinic, the process works as follows:

• Consultation: You complete an online consultation form or book a video consultation, whichever suits you. This is where you tell your doctor about your skin, your concerns, your medical history and any medications you take.
• Assessment & prescription: Your doctor will review your information and skin. If tretinoin is appropriate, they will prescribe a bespoke compounded formula at a strength and in a base suited to your skin as well as a protocol to follow. If it is not the right fit, they will tell you and suggest a safer or better alternative.
• Delivery & monitoring: Your treatment is made up by a specialist compounding pharmacy and delivered to your door. Your doctor stays involved with ongoing advice, aftercare and adjustments, including help through the purge period.

This route suits anyone who wants prescription-strength, personalised skincare without the cost and inconvenience of repeated in-person appointments. It is particularly useful for the kind of long-term, adjustable treatment that tretinoin works best as.

At City Skin Clinic, we are passionate about personalised skincare. We offer safe and effective custom skincare treatments using ingredients like tretinoin, hydroquinone, azelaic acid, niacinamide and tranexamic acid where appropriate through our online skin clinic. Our doctors treat acne, hyperpigmentation, melasma, rosacea and skin ageing through bespoke compounded treatments designed around your specific skin. To start your personalised skincare plan, book a virtual video consultation or use our online consultation form. The journey towards great skin starts here.

This article is for informational purposes only and is not a substitute for medical advice, diagnosis or treatment. Always consult a qualified medical provider for any concerns or questions you might have.