City Pollution and Your Skin

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The Truth About Peptides, Probiotics and Retinol: What Actually Works?

Peptides, probiotics and retinol are three of the most talked-about ingredients in modern skincare. Each promises healthier, younger-looking skin. But do they really work — and is anything genuinely better than retinol?

At Santi London, we take a measured approach. Rather than asking which ingredient is fashionable, we ask a more useful question: which ingredient is right for your skin?

Peptides, probiotics and retinol all have value, but they work in very different ways. Understanding those differences can help you build a routine that is effective, realistic and kind to your skin barrier.

The Santi view: retinol remains one of the strongest evidence-based topical ingredients for visible skin renewal, but it is not always the best choice for every person. For sensitive, mature, reactive or barrier-compromised skin, peptides and microbiome-supporting ingredients may sometimes be more appropriate.

Why Modern Skin Needs More Support

Skin is exposed daily to ultraviolet radiation, pollution, stress, poor sleep, hormonal change and inflammation. These factors can all contribute to collagen decline, barrier disruption, pigmentation, sensitivity and premature ageing.

This is why skincare should not only focus on wrinkles. A good routine should support long-term skin health, resilience, hydration and repair.

Peptides: The Skin Communicators

Peptides are short chains of amino acids. Amino acids are the building blocks of larger proteins such as collagen and elastin, which help give the skin structure and firmness.

In skincare, peptides are often used because they may help signal repair pathways within the skin. They are best understood as supportive ingredients rather than dramatic resurfacing agents.

Potential benefits of peptides

  • Improved skin hydration
  • Support for the skin barrier
  • Smoother-looking texture
  • Gentle support for collagen-related pathways
  • Better tolerance than many stronger active ingredients

Peptides are particularly useful for people who cannot tolerate stronger actives, including some forms of retinol. They may not produce the same level of visible renewal, but they can help maintain healthier-looking skin with less irritation.

Probiotics: Supporting the Skin Microbiome

The skin microbiome refers to the ecosystem of microorganisms that naturally live on the skin. A balanced microbiome helps support barrier function, hydration, immune regulation and protection against harmful bacteria.

Many probiotic skincare products do not contain live bacteria. Instead, they often use postbiotics, ferments or bacterial lysates. These ingredients may help calm the skin and support a healthier barrier environment.

Potential benefits of probiotic-style skincare

  • Reduced visible redness
  • Improved skin comfort
  • Support for sensitive or reactive skin
  • Barrier repair after overuse of strong actives
  • Improved resilience in stressed skin

Probiotic skincare is not usually the strongest category for lines, wrinkles or pigmentation. Its value lies more in calming, balancing and supporting the skin.

Retinol: The Gold Standard — But Not Perfect

Retinol is a vitamin A derivative and remains one of the best-researched ingredients in skincare. It helps encourage cell turnover and supports collagen production, which is why it is so widely used for ageing, texture and uneven tone.

Potential benefits of retinol

  • Improved skin texture
  • Reduced appearance of fine lines
  • More even-looking tone
  • Improved pigmentation irregularities
  • Support for collagen production over time

However, retinol is not perfect. Many people experience dryness, peeling, redness, irritation or increased sensitivity, particularly when it is introduced too quickly or used too often.

For some clients, the pursuit of retinol can damage the skin barrier rather than improve the skin.

Retinol

Best for visible renewal, texture, pigmentation and age-management — if tolerated.

Peptides

Best for gentle support, hydration, barrier health and long-term maintenance.

Probiotics

Best for calming, balancing and supporting sensitive or stressed skin.

So, Are Peptides or Probiotics Better Than Retinol?

If the only goal is visible anti-ageing, retinol usually remains the stronger topical ingredient.

But skincare is not that simple.

If your skin is sensitive, inflamed, over-treated, menopausal, rosacea-prone or recovering after a procedure, retinol may not be the best first step. In these cases, peptides and microbiome-supporting ingredients may be more appropriate because they help strengthen the skin rather than challenge it.

The best routine is not always the most aggressive routine. It is the routine your skin can tolerate consistently.

A Balanced Santi Routine

Morning

  1. Gentle cleanse
  2. Antioxidant serum, such as vitamin C if tolerated
  3. Peptide serum or barrier-supportive serum
  4. Moisturiser
  5. Broad-spectrum SPF 30–50

Evening

  1. Thorough cleanse
  2. Retinol, if suitable and tolerated
  3. Peptides or microbiome-supporting ingredients on non-retinol nights
  4. Barrier-supportive moisturiser

For more sensitive skins, retinol may only be used two or three nights per week. For very reactive skins, the first priority may be barrier repair before introducing retinoids at all.

The Future of Skincare Is Combination, Not Competition

The skincare industry often presents ingredients as rivals. In reality, peptides, probiotics and retinol can complement each other.

  • Peptides support repair and skin comfort.
  • Probiotics support balance and resilience.
  • Retinol supports renewal and visible change.

Used intelligently, they can form part of a sophisticated skincare strategy tailored to your skin’s tolerance and goals.

The Santi Verdict

Retinol remains one of the most effective topical ingredients for visible skin ageing, but it is not automatically the right answer for everyone.

Peptides and probiotics are not simply marketing trends. They can play an important role in supporting barrier health, comfort, hydration and long-term resilience.

At Santi London, we believe the best skincare routine is not the most fashionable one. It is the one that respects your skin biology and can be used consistently over time.

Need help choosing the right skincare strategy?

At Santi London, we assess the skin carefully before recommending products or treatments. Whether your concern is ageing, sensitivity, pigmentation, barrier damage or texture, we can help build a plan that suits your skin.

Book an enquiry

Frequently Asked Questions

Do peptides really work in skincare?

Peptides can support hydration, barrier function and skin repair pathways. They are usually more supportive than transformative, but they can be very useful in well-designed routines.

Are probiotics good for the skin?

Probiotic-style skincare may help calm the skin, support the barrier and improve resilience, especially in sensitive or reactive skin.

Is retinol better than peptides?

For visible renewal, texture and age-management, retinol is generally stronger. However, peptides may be better tolerated and more suitable for sensitive skin.

Can I use peptides, probiotics and retinol together?

Often yes. They can complement one another when used correctly. Retinol can support renewal, while peptides and microbiome-supporting ingredients help maintain comfort and barrier health.

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Pollution and Enlarged Pores: What Does the Science Say?

For many years, enlarged pores were thought to be determined mainly by genetics, age and oil production. However, a growing body of dermatological research suggests that air pollution may also contribute to visible pores, rougher skin texture, pigmentation and premature skin ageing.

For those living in major cities such as London, daily exposure to traffic emissions, particulate matter, nitrogen dioxide, ozone and other airborne pollutants may affect the skin more than previously recognised.

At Santi London, we are increasingly interested in the relationship between environmental stressors and skin health. Understanding the science allows us to design better skincare routines and treatment plans for patients concerned about enlarged pores, congestion and premature ageing.

What Is Air Pollution?

Air pollution is a complex mixture of substances in the indoor and outdoor environment. The World Health Organization defines it as contamination of the environment by chemical, physical or biological agents that alter the natural characteristics of the atmosphere.

Common pollutants include:

  • PM2.5 and PM10 particulate matter
  • Nitrogen dioxide (NO2)
  • Ozone (O3)
  • Polycyclic aromatic hydrocarbons (PAHs)
  • Volatile organic compounds (VOCs)

These pollutants can come from traffic emissions, heating systems, construction activity, industrial processes and indoor environmental sources. Unlike ultraviolet radiation, pollution is largely invisible, which makes its impact easy to underestimate.

Can Pollution Really Make Pores Look Larger?

The evidence suggests that it can.

A 2022 study published in Medicine examined the relationship between air pollution exposure and facial skin characteristics. The researchers found that air pollution was significantly associated with features of skin ageing, including changes in facial pores, texture and pigmentation.

This does not mean pollution physically enlarges pores overnight. Rather, pollution appears to contribute to biological processes that make pores look more visible over time.

How Pollution Affects the Skin

1. Oxidative Stress

One of the main mechanisms is oxidative stress.

Air pollutants can generate reactive oxygen species, often called free radicals. When free radicals exceed the skin’s antioxidant defences, they can damage cells, lipids, proteins and DNA.

Scientific reviews have repeatedly identified oxidative stress as a key pathway through which pollution contributes to skin ageing and inflammatory skin disease.

2. Collagen and Elastin Breakdown

Collagen and elastin provide structural support to the skin surrounding pores.

Pollution-induced oxidative stress can activate enzymes known as matrix metalloproteinases, or MMPs. These enzymes break down collagen and elastin in the skin.

As collagen support weakens around the follicular opening, pores can appear larger and skin texture can become less refined.

3. Inflammation

Pollution can also trigger chronic low-grade inflammation in the skin.

This may contribute to:

  • Redness
  • Sensitivity
  • Barrier disruption
  • Accelerated ageing
  • Increased skin reactivity

Over time, inflammation can influence sebaceous gland activity and follicular structure, both of which are relevant to visible pores.

4. Sebum Oxidation and Congestion

Fine particulate matter can mix with sebum, dead skin cells and environmental debris.

This may contribute to:

  • Blackheads
  • Congestion
  • Breakouts
  • Uneven skin texture
  • More visible pores

This is one reason why evening cleansing is particularly important for people living or working in urban environments.

Why City Living Matters

Urban populations are generally exposed to higher concentrations of airborne pollutants than rural populations.

Research has associated air pollution exposure with several visible skin changes, including:

  • Wrinkles
  • Pigmentation
  • Uneven skin tone
  • Skin barrier disruption
  • Premature ageing
  • Changes in skin texture

Pollution may also work together with UV exposure. This is important because UV radiation remains one of the strongest drivers of collagen breakdown and skin ageing. When pollution and UV exposure occur together, the oxidative burden on the skin may be greater.

How Can You Protect Your Skin?

It is not possible to avoid pollution completely, especially in a city such as London. However, there are several practical steps that may help reduce pollution-related skin stress.

1. Cleanse Thoroughly in the Evening

Evening cleansing is one of the most important anti-pollution skincare steps.

Pollution particles accumulate on the skin during the day and mix with sebum, sunscreen and environmental debris. Removing these particles before sleep may help reduce ongoing oxidative stress and congestion.

For most skin types:

  • Morning: gentle cleanse or rinse
  • Evening: thorough cleanse

If you wear sunscreen or makeup, double cleansing in the evening may be useful.

2. Use Vitamin C in the Morning

Vitamin C is one of the best-known topical antioxidants in dermatology.

It may help by:

  • Neutralising free radicals
  • Supporting collagen synthesis
  • Improving pigmentation
  • Reducing oxidative stress from UV and pollution exposure

For many people, a vitamin C serum used in the morning before sunscreen is a sensible anti-pollution strategy.

3. Wear Daily SPF

Daily sunscreen remains essential.

SPF helps protect collagen and elastin from UV-induced breakdown. Because pollution and UV may amplify each other’s effects, broad-spectrum SPF 30–50 is important even when the concern is pollution rather than sun damage alone.

4. Consider Niacinamide

Niacinamide may be helpful for patients concerned about pores and oiliness.

It may support:

  • Barrier function
  • Oil regulation
  • Reduced inflammation
  • Improved skin texture

This makes it particularly useful for oily or combination skin types.

5. Use Glycolic Acid Carefully

Glycolic acid does not remove pollution directly. However, it may help improve some of the effects associated with pollution-related congestion and rough texture.

Potential benefits include:

  • Improved cell turnover
  • Smoother skin texture
  • Reduced congestion
  • Improved radiance

Most people tolerate glycolic acid best when used two to four evenings per week rather than every night. Overuse can irritate the skin barrier and worsen sensitivity.

6. Retinoids for Long-Term Pore and Texture Support

Retinoids are among the most effective ingredients for improving skin texture and visible pores over time.

They support collagen production, improve cell turnover and help reduce follicular congestion. This makes them particularly relevant where visible pores are linked to ageing, oiliness and loss of collagen support.

7. Repair the Skin Barrier

A strong skin barrier may be more resilient to environmental stress.

Useful barrier-supportive ingredients include:

  • Ceramides
  • Cholesterol
  • Fatty acids
  • Glycerin
  • Hyaluronic acid

This is particularly important for patients who are also using active ingredients such as retinoids, glycolic acid or vitamin C.

A Simple Anti-Pollution Skincare Routine

Morning

  1. Gentle cleanse
  2. Vitamin C serum
  3. Niacinamide, if suitable
  4. Moisturiser
  5. Broad-spectrum SPF 30–50

Evening

  1. Thorough cleanse
  2. Retinoid or glycolic acid, depending on skin type and tolerance
  3. Barrier-supportive moisturiser

Professional Treatments for Enlarged Pores and Pollution-Related Skin Ageing

For patients with more visible pores, rough texture or early signs of environmental ageing, professional treatments may be useful.

These include:

  • Medical-grade chemical peels
  • Microneedling
  • Radiofrequency microneedling
  • Fractional laser resurfacing
  • LED phototherapy

Many of these treatments work by stimulating collagen and improving the architecture of the skin around the pore opening.

The Santi Perspective

The science increasingly suggests that visible pores are not determined solely by genetics.

Pollution, UV exposure, smoking, sebum oxidation, inflammation and collagen loss can all influence how pores appear over time.

For London skin, a sensible strategy should include:

  • Thorough evening cleansing
  • Morning antioxidant protection, such as vitamin C
  • Daily broad-spectrum SPF
  • Judicious use of retinoids or glycolic acid
  • Barrier-supportive moisturisers

While no routine can completely eliminate the effects of urban living, the right skincare and treatment plan can help reduce oxidative stress, support collagen and maintain smoother, healthier-looking skin.

References

  1. Huang CH et al. Detrimental correlation between air pollution with skin aging in Taiwan. Medicine. 2022.
  2. Han HS et al. Air Pollution and Skin Diseases. Annals of Dermatology. 2025.
  3. Bocheva G et al. Environmental Air Pollutants Affecting Skin Functions with Systemic Implications. International Journal of Molecular Sciences. 2023.
  4. Paik K et al. Particulate Matter and Its Molecular Effects on Skin. 2024.
  5. Robic J et al. The impact of air pollution on the facial skin of Caucasian women. 2024.
  6. World Health Organization. Air Pollution: Overview.
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