As a cosmetic doctor, I will be blunt: the Tretinoin craze on social media is getting out of hand. Numerous patients attending my clinic want this prescription, convinced it’s the holy grail of anti-ageing. It’s not. And here’s why you should think twice beforeusing it on your face every night.
Tretinoin
Vitamin A Is a Hero — But Form Matters Enormously
Vitamin A is genuinely one of the most evidence-backed ingredients in skincare. Decades of research confirm it stimulates collagen, accelerates cell turnover, reduces pigmentation and softens fine lines. I have no argument with Vitamin A itself. My argument is with Tretinoin being positioned as the default, superior form for everyday anti-ageing use.
Vitamin A comes in a cascade of forms. Retinyl esters sit at the bottom of the potency ladder. Retinol sits in the middle. And retinoic acid — the active form your skin actually uses — is what Tretinoin IS. By jumping straight to the end product, you completely bypass the skin’s natural conversion process, and that causes problems.
The Conversion Cascade: Why It Exists
Your skin converts Vitamin A through a controlled enzymatic cascade: retinyl ester → retinol → retinoic acid. This process is regulated. Your skin converts only as much as it needs at any given time. When you apply Retinol, you’re working with this system.
When you apply Tretinoin, you’re bypassing it entirely — flooding the skin with the end-stage active acid, whether it’s ready or not. I’ve seen patients on Tretinoin for months and even years who still haven’t properly tolerated it. Compare that to patients using a well-formulated, high-potency Retinol — they typically adapt within two to four weeks, particularly when the right delivery system is in place.
Step One: Prepare Your Skin First
Here’s what most people skip entirely — and it’s arguably the most important step. Jumping into a potent Vitamin A product without preparing the skin barrier first is like decorating a wall without priming it. The result is poor, and in the case of your skin, potentially damaging.
At my clinic, I follow ZO Skin Health’s GSR® protocol — Getting Skin Ready — a three-step foundational approach of cleansing, exfoliating and toning that normalises skin function and reduces existing inflammation before any active treatments are introduced. This is the non-negotiable first step.
Why does skin preparation matter so much? Because a compromised or unprepared skin barrier will react more aggressively to Vitamin A. The irritation isn’t just uncomfortable — it’s counterproductive. Inflammation itself accelerates ageing. If your skin is sensitised, dehydrated or has an impaired barrier, you are not ready for a Retinol, and you are certainly not ready for a Tretinoin.
The ZO GSR® foundation consists of a gentle cleanser appropriate to your skin type, an exfoliating step such as ZO’s Exfoliating Polish Complexion, and a toner such as Complexion Renewal Pads to prime the skin. Only once this is established — typically after two to four weeks — should you introduce your Vitamin A.
Why Most High-Street Retinols Are Letting You Down
Before we talk about Tretinoin being unnecessary, we need to address something else. A significant reason people turn to Tretinoin in the first place is that they’ve tried high-street Retinol and seen little to no result. And frankly, that’s often not surprising at all — because most over-the-counter Retinol products are fundamentally flawed before they even reach your skin.
Retinol is one of the most unstable active ingredients in skincare. It is highly sensitive to light, air, heat and oxidation. Research published in the Journal of Cosmetic Dermatology found that commercial Retinol products can lose anywhere from 0% to 80% of their potency within just six months at room temperature — and that’s before you’ve even opened the jar. Transfer that product into the wrong packaging, expose it to your bathroom light and ambient air every morning, and you may be left with a cream containing a fraction of the Retinol concentration stated on the label.
This is the dirty secret of the drugstore skincare aisle. The product that claims 0.5% Retinol on the front? By the time it reaches your skin, it may be delivering considerably less. That’s before we even consider penetration — how much of that Retinol actually makes it through the skin barrier to where it needs to act.
There’s also the question of concentration honesty. Many mainstream brands formulate with Retinol concentrations too low to produce meaningful clinical change, rely on unstabilised forms that degrade rapidly, use packaging that accelerates degradation (jar packaging, clear bottles), and include no supporting ingredients to enhance penetration or reduce the conversion burden on skin cells.
So when patients say “I tried Retinol and it didn’t work” — what they almost always mean is “I tried a poorly formulated, inadequately stabilised, sub-therapeutic Retinol product from a shelf.” That is a product problem, not a Vitamin A problem.
The Tretinoin Tolerance Problem: It’s Real and It’s Underplayed
Tretinoin causes what dermatologists politely call a “retinisation period.” Patients call it a nightmare. We’re talking about peeling, redness, burning, flaking, and paradoxical dryness that can last weeks to months. Worse, it frequently causes post-inflammatory hyperpigmentation in darker skin tones — the very thing most patients are trying to treat.
I’ve had patients come to me after six months on Tretinoin with a compromised skin barrier, increased sensitivity, and more redness than they started with. Was it working underneath? Possibly. But at what cost to their daily life and confidence?
High-potency Retinol, delivered via advanced encapsulation technology, causes far less irritation while delivering results that are genuinely impressive. The key is choosing a well-engineered formulation — not simply reaching for the pharmaceutical option because the internet told you to.
Tretinoin Requires a Prescription for a Reason
In the UK, Tretinoin is a prescription-only medicine. It was classified this way because it is a potent pharmaceutical, not a cosmetic. When used appropriately — for severe acne or under careful medical supervision — it absolutely has a place.
But the proliferation of online prescribing platforms handing it out for general anti-ageing, without proper skin assessment, barrier evaluation or follow-up, concerns me deeply. I see the consequences in my clinic regularly: patients prescribed 0.05% Tretinoin with a brief consultation, and zero follow-up. Their skin is a mess and their trust in skincare has been shattered.
SPF Is Non-Negotiable — and Here’s Why
If there is one message I want every single patient to leave my clinic with, it is this: SPF is not optional, and it is certainly not just a summer product.
Vitamin A in all its forms — including Retinol — accelerates cell turnover, which means the fresh new skin cells it brings to the surface are more vulnerable to UV damage. Using a Retinoid at night without sun protection in the morning is actively counterproductive. You are stimulating new skin growth with one hand and damaging it with the other.
But the reason for daily SPF goes far beyond protecting your Vitamin A investment. UV radiation is the single biggest extrinsic cause of skin ageing. Approximately 80% of visible facial ageing is caused by sun exposure — not time, not gravity, not genetics. UVA rays penetrate cloud and glass year-round, causing collagen degradation and DNA damage even on a grey London day in November. If you do nothing else for your skin, wear SPF 50 every morning.
At my clinic I use and recommend the ZO Skin Health sunscreen range. The ZO portfolio provides Triple Spectrum Protection® — shielding against UVA, UVB, HEV (blue light from screens) and IR-A (infrared) rays, as well as pollution. This matters because most standard sunscreens only address UVA and UVB. HEV and infrared are genuine ageing factors that the vast majority of patients have never even considered.
My favourites from the range: the Daily Sheer Broad-Spectrum SPF 50 for everyday wear (lightweight and excellent under make-up), the Smart Tone Broad Spectrum SPF 50 for those who want a subtle tint, and the Sunscreen + Powder SPF 45 for patients who want to reapply over make-up throughout the day.
The rule is simple: SPF 50 every morning, reapply every two hours if outdoors, and never skip it.
Why Medical-Grade Retinol — Used Correctly — Is Enough
For the vast majority of my patients, well-formulated, high-potency medical-grade Retinol is not a compromise. It is the right choice. But the operative phrase is medical-grade. This is where the ZO Skin Health range stands in a completely different category from anything you’ll find on the high street.
ZO’s Vitamin A products use proprietary delivery technologies — oleosomes and microemulsion systems — that solve the core problems that make most OTC Retinols ineffective. Oleosomes are natural microspheres derived from plant seed oils. They encapsulate the Retinol, protecting it from light, air and oxidation, and then release it in a slow, controlled manner once on the skin. This means the concentration you’re applying is the concentration actually reaching your skin cells — not a degraded fraction of it.
This matters enormously. A 1% Retinol in an oleosome delivery system is a fundamentally different proposition to a 1% Retinol in a standard emulsion sold in a clear glass jar. The first delivers; the second may not.
Beyond delivery, ZO products are formulated at clinically meaningful concentrations, supported by antioxidant complexes, anti-irritant botanicals and barrier-reinforcing ingredients that work synergistically with the Retinol rather than simply padding out a formula. This is what physician-dispensed, medical-grade skincare actually means in practice — and it’s why the results my patients see with ZO are categorically different from what they experienced with their previous high-street routine.
The ZO Skin Health Vitamin A Range: What I Use in My Clinic
The ZO Skin Health Vitamin A range is built entirely around Retinol — and that is a strength, not a limitation. Here is how the range works as a clinical progression:
Retinol Skin Brightener 0.25% — The entry point. Ideal for Vitamin A beginners or those with sensitive skin. Uses an oleosome delivery system for slow, controlled release, paired with bakuchiol to amplify brightening with reduced irritation. This is where I start the majority of my patients.
Retinol Skin Brightener 0.5% — The mid-range progression for patients who have built tolerance and are ready to step up. Same encapsulated delivery, same brightening focus.
Retinol Skin Brightener 1% — High potency for those with proven Retinol tolerance. Contains ascorbyl glucoside (stable Vitamin C) to amplify tone-evening and antioxidant protection.
Wrinkle + Texture Repair (0.5% Retinol) — A microemulsion-delivery serum specifically formulated for deeper wrinkles and texture irregularities, rather than pigmentation. A distinct formulation targeting structural skin concerns.
Radical Night Repair (1% Retinol) — My go-to for established Retinol users who want serious results. Formulated with 1% microencapsulated Retinol, an anti-irritant botanical complex of Sichuan pepper extract, sunflower seed oil and rosemary leaf extract, plus Vitamins C, E and A as antioxidants. Delivers results akin to light chemical peels, overnight.
Complex A+ (1.3% Retinol) — The most potent product in the ZO consumer Vitamin A range. Formulated with 1.3% Retinol amplified with bakuchiol, delivered via a microemulsion system that penetrates to deeper skin layers. Clinically proven to improve multiple manifestations of ageing within 12 weeks. Reserved for advanced Retinol users, and I strongly recommend medical supervision.
The ZO philosophy mirrors my own: build the skin first with GSR®, introduce Vitamin A in a graduated way that your skin can actually tolerate, and always protect with SPF.
The Bottom Line
Vitamin A is a cornerstone of evidence-based skincare. But the form in which you use it matters enormously — and so does the quality of the formulation and the preparation and protection that surrounds it.
Prepare your skin barrier before starting any Vitamin A. Use SPF 50 without exception, every single morning, year-round. Don’t waste money on high-street Retinols that degrade before they reach your skin. Choose a medical-grade, properly stabilised Retinol over Tretinoin for general anti-ageing. Progress gradually through concentrations under proper guidance. And work with a practitioner who will actually assess your skin, not auto-prescribe based on a selfie.
Your skin barrier is your most valuable asset. Invest in it properly.
