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By Alice Henshaw, Aesthetic Practitioner and Founder of SKIN|CYCLES
I have spent over a decade treating skin at my Harley Street clinic, and if there is one pattern I see again and again, it is this: city living ages skin faster than people expect. Patients walk in with dullness, pigmentation and fine lines they cannot explain, and the culprit is almost always the same. It is not just sun damage. It is the combination of UV exposure, air pollution and blue light from screens working together, day after day, to break skin down.
The good news? You can fight back with two simple weapons: antioxidant serums and broad-spectrum SPF. In this guide, I will walk you through exactly how I recommend layering them, morning and night, to build what I call your "city skin shield."
Understanding what you are protecting against makes the whole routine click into place. Urban skin deals with three major aggressors simultaneously.
UV radiation does not take days off. Even on overcast mornings in London, UVA rays penetrate cloud cover and office windows, quietly breaking down collagen. UVB causes more obvious surface damage like redness and burns, but it is UVA that drives the deep, slow ageing most of my patients worry about.
Air pollution is the one people underestimate. Particulate matter (PM2.5), ozone, nitrogen dioxide from traffic... these microscopic particles settle on your skin, clog pores and trigger oxidative stress. Research has shown that ozone alone can deplete your skin's natural stores of vitamins C and E on contact. One large study found that just a small increase in traffic-related nitrogen dioxide was associated with 25% more dark spots on the cheeks. That statistic stopped me in my tracks when I first read it, and it changed how I counsel every patient who lives in a city.
Blue light from phones, laptops and LED lighting is the newest concern. It penetrates deeper into the skin than UVA and generates free radicals that contribute to hyperpigmentation and loss of firmness over time. It is not as intense as UV, but the exposure is constant and cumulative.
Here is what makes this trio so damaging: they work together. Pollution particles can actually intensify UV damage by generating extra free radicals on the skin's surface. A weakened barrier from pollution lets UV and blue light penetrate more easily. Everything compounds.
This is something I explain to nearly every patient. Sunscreen is essential, but no SPF blocks 100% of UV rays. Even SPF 50 lets a small percentage through, and sunscreens offer limited protection against visible light and pollution-generated free radicals.
That is where antioxidants come in. When you layer an antioxidant serum under your sunscreen, any UV that slips through meets a second line of defence. Vitamin C, glutathione and other antioxidants neutralise free radicals in real time before they can damage collagen or DNA. Studies have shown that applying vitamins C and E under sunscreen reduces UV damage significantly more than sunscreen alone.
Think of sunscreen as your shield and antioxidants as your shock absorbers. The sunscreen blocks most of the assault, and the antioxidants handle whatever gets through. Together, they create genuinely comprehensive protection that neither can deliver on its own.
There is a practical benefit too. SPF actually helps your antioxidant serum last longer by preventing UV from oxidising it on your skin. And antioxidants improve your sunscreen's performance. It is a relationship where both sides make the other work harder.
Not all antioxidants do the same job. I always advise using a combination, because different antioxidants target different types of free radicals and offer distinct benefits.
Vitamin C (L-ascorbic acid) is the cornerstone. It scavenges free radicals, supports collagen production, brightens pigmentation and has the strongest evidence base of any topical antioxidant. I formulated our Luminesce-C Skin Revival Serum with 5% L-ascorbic acid specifically for daily morning use under SPF. It is the single product I would choose if I could only pick one antioxidant.
Glutathione is what scientists call the body's "master antioxidant." It neutralises free radicals directly and also recycles other antioxidants like vitamins C and E, extending their effectiveness. We deliver glutathione through our proprietary TGHA4 complex, which uses liposome encapsulation to get it deep into the skin where it can actually work.
Grape seed extract contains proanthocyanidins that are remarkably potent. Some research suggests they are up to 20 times more powerful than vitamin E. Grape seed protects collagen and elastin, calms inflammation and even helps bind up metal pollutants on the skin.
Black tea ferment is one I have grown increasingly excited about. The fermentation process makes the polyphenols in black tea highly bioavailable to skin cells. It improves elasticity, protects against glycation (the process where sugar stiffens collagen) and helps balance the skin microbiome, which pollution can disrupt.
Resveratrol is a polyphenol from red grape skins that works brilliantly at night. Beyond scavenging free radicals, it activates sirtuins, which are genes associated with healthy cell function and longevity. I often recommend it as an evening antioxidant to support overnight repair.
The key principle is layering multiple antioxidants for broad-spectrum defence. Our ExoYouth Radiance Cream combines glutathione, peptides, grape seed extract and black tea ferment in one formula for exactly this reason.
Mornings are about prevention. You are dressing your skin in armour before stepping out. Here is the exact protocol I follow and recommend to my patients.
Step 1: Cleanse gently. Overnight, your skin accumulates sweat and sebum that can block absorption of your morning actives. Use something mild that will not strip your barrier. Our Squalane Cream Cleanser removes impurities while maintaining moisture balance. Lukewarm water, 30 seconds of gentle massage, pat dry. Your skin should feel soft, never tight.
Step 2: Apply your antioxidant serum. This is the critical step. While your skin is clean and slightly damp, press 3 to 4 drops of Luminesce-C Skin Revival Serum into your face and neck. Give it a minute or two to absorb before moving on. During this pause, the vitamin C is soaking into your epidermis and getting to work neutralising free radicals.
Step 3: Moisturise if needed. If you have dry skin or it is winter, apply a light moisturiser after your serum. Bio-Balance Moisturiser is ideal here. It is lightweight, absorbs quickly and contains probiotics plus our TGHA4 complex to reinforce your barrier. If your skin runs oily, you can skip this and go straight to SPF.
Step 4: Apply broad-spectrum SPF. This is non-negotiable, every single day. For city life, I recommend SPF 50 or higher. Use a generous amount (about half a teaspoon for face and neck) and make sure you cover your hairline, ears and under the chin.
I formulated two options depending on your needs:
DNA Defence Sun Shield SPF 100 is a lightweight tinted sunscreen with ultra-high protection. The iron oxide tint blocks visible light (including blue light), which clear sunscreens cannot do. It also contains a DNA Defence Complex with green tea, ferulic acid, peptides and vitamin E that actively support repair while you wear it. This is my go-to for patients with pigmentation concerns or anyone who spends significant time outdoors.
Lumina Shield SPF 50 is a non-tinted option with a luminous, primer-like finish. It uses zinc oxide and titanium dioxide and layers beautifully under makeup. If you want everyday protection that feels like skincare rather than sunscreen, this is it.
Step 5: Reapply. Sunscreen needs reapplication every two to three hours, especially if you are outdoors. Lumina Mist SPF 50 is a sunscreen spray you can use over makeup without disrupting anything. Keep it in your bag and spritz in the afternoon. It also contains hydrating ingredients like aloe vera and sodium hyaluronate, so it doubles as a refreshing pick-me-up for air-conditioned office skin.
Nighttime is when your skin shifts into recovery mode. Your job is to remove the day's damage and feed your skin what it needs to rebuild.
Step 1: Double cleanse. This is essential for city dwellers. Start with an oil-based cleanser like ExoYouth Cleansing Balm to dissolve sunscreen, makeup and pollution particles. Massage it onto dry skin, add water to emulsify, then rinse. Follow immediately with Squalane Cream Cleanser to clear any remaining residue. You do not want soot or particulate matter sitting in your pores overnight generating free radicals while you sleep.
Step 2: Apply nighttime antioxidants. Evening is the time for repair-focused antioxidants. ExoYouth Radiance Cream works beautifully here as both serum and moisturiser. It contains EGF-mimicking peptides to accelerate healing, plus glutathione, black tea ferment and grape seed extract. I think of it as a facial treatment while you sleep. If you use retinol, alternate it with antioxidant-focused nights. On retinol-free evenings, this cream provides intensive repair.
Step 3: Seal with a barrier-boosting moisturiser. If your skin needs extra support, layer Bio-Balance Moisturiser over your treatment. Its probiotic formula helps restore the skin microbiome and rebuild the lipid barrier that pollution degrades during the day. You will wake up with plump, calm skin instead of tightness or irritation.
Do not forget your neck and chest. They get the same exposure as your face but are often neglected, and they will show it over time.
Your core strategy stays the same year-round: cleanse, antioxidants, SPF. But the supporting details should flex with your environment.
In summer, lighten your textures but increase your SPF. DNA Defence SPF 100 is ideal for high UV index days. Reapply Lumina Mist more frequently if you are sweating, and pay extra attention to evening cleansing to prevent congestion from heat and humidity.
In winter, UVA is still present even on grey days, and pollution can actually worsen due to heating emissions. Layer a hydrating serum like 5D HA Serum under your vitamin C for extra moisture, and use a richer cream at night. Do not skip SPF just because the sun is not visible.
If you work indoors, remember that UVA penetrates windows and screen time means constant blue light exposure. A tinted SPF with iron oxides (like DNA Defence) offers the best indoor protection. Keep Lumina Mist at your desk and spritz every few hours to combat air-conditioned dryness.
I see patients every week for treatments like chemical peels, micro-needling and laser resurfacing. And I always tell them the same thing: your post-treatment skincare matters as much as the procedure itself.
After any treatment, your barrier is temporarily compromised. This makes your skin more vulnerable to UV damage and pollution, and more prone to post-inflammatory hyperpigmentation. Simplify your routine to gentle cleansing, hydrating serums (5D HA is wonderful for healing skin), a soothing antioxidant moisturiser like Bio-Balance, and high-factor SPF without exception.
DNA Defence Sun Shield SPF 100 is what I recommend to all my post-procedure patients. Its gentle formula will not sting sensitive skin, and its built-in antioxidants and DNA repair ingredients actively support recovery. Start wearing it the day after your procedure and do not stop.
Patients who maintain their antioxidant and SPF routine consistently between treatments heal faster and get better results. Their skin is healthier, more resilient and better equipped to respond to whatever we do in the clinic. Treatments give you a head start, but daily skincare sustains and builds on those results.
Do I need antioxidants if I already wear SPF? Yes. SPF blocks most UV but cannot neutralise all free radicals, especially those generated by pollution and blue light. Antioxidants handle what sunscreen cannot, and research shows the combination is significantly more protective than either one alone.
Can I use vitamin C every day? Absolutely. Vitamin C is safe and beneficial for daily use. In fact, consistent daily application is how you get the best results for brightening, collagen support and environmental protection.
What order should I apply my products in the morning? Cleanser, antioxidant serum, moisturiser (if needed), then SPF as the final step. Thinnest to thickest consistency, with SPF always last.
Does SPF matter on cloudy days? Yes. Up to 80% of UV rays penetrate cloud cover, and UVA passes through glass windows. Daily SPF is essential regardless of weather.
How soon after a skin treatment can I use antioxidants? Most gentle antioxidant formulas (peptides, glutathione, niacinamide) can be used within a day or two. Pure L-ascorbic acid may need to wait a few days if skin is very raw. Always follow your practitioner's specific advice.
RN · NMP · Founder of SKIN|CYCLES & Harley Street Injectables
Alice is the founder of SKIN|CYCLES, a cosmeceutical skincare range formulated around the proprietary TGHA4® peptide complex and sold at Harrods, Liberty and Harvey Nichols. She is also the founder and medical director of Harley Street Injectables, the largest clinic on Harley Street dedicated exclusively to non-surgical aesthetic treatments. A qualified nurse prescriber registered in the UK, Australia and New Zealand, Alice is a Key Opinion Leader for Allergan Aesthetics, was named Best Aesthetic Injector in London by the GHP Awards, and has been featured in Vogue, Tatler, Vanity Fair, and the Tatler Cosmetic Surgery Guide.
To explore the SKIN|CYCLES range, visit skincycles.com. To book a consultation at Harley Street Injectables, visit harleystreetinjectables.com or call +44(0) 3455 485 658.
