Part of our guides to Skincare Over 40 and Skincare Ingredients Explained.
If it feels like everyone around you suddenly has sensitive skin, you are not imagining it. A peer reviewed review of prevalence studies published in Frontiers in Medicine found that around 70% of adults report some degree of sensitive skin, with roughly 46% describing it as moderate or severe. Individual studies range widely, from 23% to over 90%, which tells you something about how loosely the term gets used. What is not in question is the direction of travel.
Here is the part most beauty brands will not tell you. This is not only about genetics or the environment. Your skincare products themselves may be causing the sensitivity they claim to treat.
More than just numbers
The sensitive skincare market is projected to reach almost 81 billion US dollars by 2030, growing at 8.8% a year according to Grand View Research. That sounds like good news for anyone looking for solutions. Read it another way and it is a market expanding because the problem is getting worse.
Consumer data backs that up. A 2022 survey by Aveeno, which is a Johnson & Johnson brand rather than an independent researcher, asked 1,000 people about their sensitive skin. Their findings:
- 79% said their sensitive skin had stayed the same or worsened over time
- 65% said theirs started before the age of 30
- Those describing themselves as extremely sensitive were 200% more likely to have a diagnosis of eczema, rosacea, acne, or allergies than those describing themselves as slightly sensitive
We are citing a mass market brand's own research here deliberately. When a company selling conventional skincare publishes data showing that most people's sensitivity is not improving, that is harder to dismiss than a statistic from a brand with our position.
Worth being clear about what that survey is and is not. It is self reported, from 1,000 participants who already identified as having sensitive skin, and it was commissioned by a brand. It tells you what people experience. It does not prove causation.
How common ingredients compromise the barrier
Your skin barrier is a brick and mortar structure of cells and lipids, and our piece on what it does all day covers how it works. Many conventional ingredients break it down systematically, which creates a loop:
- Harsh ingredients strip natural oils and disrupt pH balance
- The compromised barrier lets irritants penetrate deeper
- Inflammation damages essential barrier proteins
- Skin becomes increasingly reactive
- More products are bought to treat the sensitivity, continuing the cycle
Safety assessments have traditionally looked at ingredients one at a time. The gap is what happens when you use many products containing many ingredients, every day, for years. Most people use somewhere between 10 and 15 products daily. Even an ingredient considered safe on its own can become a problem through repeated exposure in combination over months.
The worst offenders
1. Harsh surfactants
Sodium lauryl sulfate and similar compounds create the foam you associate with a proper clean. The barrier cost is well documented. In a three week study on 18 volunteers, daily SLS application raised transepidermal water loss 1.5 times after four days, 2.6 times by the end of week two, and 3.3 times by week three. Stratum corneum turnover time nearly halved, from 19 days to 11.
The mechanism is more interesting than the usual explanation. Surfactants are often said to strip the skin's oils, but ultrastructural work found the upper layers kept their intercellular lipid structure intact. The damage sits deeper, in how the skin assembles and deploys new barrier lipids rather than in the removal of existing ones.
Long term effect: cumulative impairment of the skin's ability to rebuild its own barrier, showing up as tightness, reactivity, and water loss that does not resolve between uses. Our piece on cleanser mistakes over 40 covers what to use instead.
2. Fragrance
Fragrance is one of the most commonly identified causes of contact dermatitis. Both synthetic and natural fragrance compounds can trigger reactions, and masking fragrances added to cover a formulation's own smell cause problems too.
Long term effect: repeated exposure can sensitise the immune system, making skin progressively more reactive.
3. Drying alcohols
Denatured alcohol, SD alcohol and isopropyl alcohol appear in toners, astringents and lightweight moisturisers. They give a quick dry finish and strip the acid mantle doing it.
Long term effect: chronic dehydration and barrier impairment, felt as tightness, flaking, and increased sensitivity to everything else you apply.
4. Exfoliants used badly
Acids benefit skin when used correctly. The problem is concentration, frequency, and layering several exfoliating products without realising it.
Long term effect: over exfoliation thins the stratum corneum, reducing the skin's ability to protect itself. Our guide to exfoliation after 40 covers how often is enough.
5. Certain preservatives
Preservatives are necessary for product safety, and some are known irritants. Propylene glycol, common in moisturisers and topical medications, triggers reactions in some people.
Long term effect: chronic low level irritation that weakens the barrier and primes skin for sensitivity.
What happens at cellular level
Four proteins do most of the work of holding the barrier together. Filaggrin connects keratin fibres and helps form the keratin envelope. Aquaporin 3 handles water movement in and out of cells and supports elasticity and repair. Caspase 14 drives the final stage of keratinocyte differentiation and, as Hoste and colleagues showed, breaks filaggrin down into the free amino acids that become your skin's natural moisturising factors. Kallikrein 7 does the opposite job, breaking down the links between cells.
Research using an SLS induced barrier damage model found the pattern you would expect: barrier damage means less filaggrin, less aquaporin 3, and less caspase 14, alongside more kallikrein 7. Low expression of the first three leaves the stratum corneum structurally incomplete. High kallikrein 7 triggers flaking.
The consequences follow from the biology:
- Increased water loss through a barrier that can no longer hold it
- Enhanced penetration of allergens and irritants an intact barrier would block
- Heightened nerve sensitivity as nerve endings sit closer to the surface
- Chronic inflammation that prevents repair completing
Why sensitive skin products often make it worse
Many products marketed for sensitive skin contain the ingredients that caused the sensitivity. That is a commercially convenient loop: harsh products damage the barrier, sensitivity develops, sensitive skin products get bought, sensitivity persists, more products get bought.
The answer is not more products. It is fewer, better chosen ones, and our piece on how much of a routine you actually need makes that case at length.
Where we stand, including the awkward part
We formulate without sulfates, drying alcohols, synthetic fragrances, parabens and hydroquinone, at pH levels that respect the acid mantle, with short ingredient lists rather than long ones. Every formula is published in full on EWG's database.
Here is the part that belongs in an article about irritants. PURIFY, ILLUMINATE and REJUVENATE all contain naturally derived essential oils at low levels. Essential oils are a recognised trigger for some people, and being plant derived does not exempt them from that. We list them openly and we would rather you patch tested than took our word for it.
An article naming other brands' irritants while quietly omitting its own would not be worth reading.
Rebuilding the barrier
If you are already dealing with sensitivity, recovery is realistic.
- Simplify ruthlessly. Gentle cleanser, simple moisturiser, sunscreen. Nothing else until things settle.
- Look for barrier supporting ingredients. Ceramides, niacinamide, and fatty acids that mimic your skin's own lipid structure.
- Give it time. Barrier repair takes 4 to 8 weeks of consistent, gentle care.
- Read labels critically. A long ingredient list is not better. It is more opportunities for irritation.
Sleep and stress both belong here too, since barrier repair happens overnight and cortisol impairs it. Our guide to what happens to skin overnight covers that half.
Questions we get asked
What actually causes sensitive skin? A barrier that has stopped holding together properly. Genetics and environment play a part, but the products themselves are often the driver: harsh ingredients strip oils and disrupt pH, irritants get in deeper, inflammation damages the proteins that hold the barrier, and skin gets more reactive with every round.
Which ingredients cause sensitivity most often? Harsh surfactants such as sodium lauryl sulfate, fragrance of both the synthetic and natural kind, drying alcohols including denatured and SD alcohol, exfoliating acids used too often or layered without realising, and preservatives such as propylene glycol.
How common is sensitive skin? A review of prevalence studies in Frontiers in Medicine found around 70% of adults report some degree of it, and roughly 46% describe it as moderate or severe. Individual studies range from 23% to over 90%, which says more about how loosely the term is used than about the skin.
Does sodium lauryl sulfate really damage the barrier? Yes, and it has been measured. In a three week study on 18 volunteers, daily SLS application raised transepidermal water loss 1.5 times after four days, 2.6 times by the end of week two, and 3.3 times by week three. Stratum corneum turnover nearly halved, from 19 days to 11.
Can natural or plant derived ingredients cause sensitivity? They can. Essential oils are a recognised trigger, and being plant derived gives them no exemption. Natural is not a safety category.
Do Byra products contain essential oils? PURIFY, ILLUMINATE and REJUVENATE contain naturally derived essential oils at low levels. If essential oils have irritated you before, patch test first. Every formula is published in full on EWG's database.
How long does it take to repair a damaged barrier? Around 4 to 8 weeks of consistent, gentle care. Simplify to a cleanser, a moisturiser and sunscreen, look for ceramides and niacinamide, and add nothing new until things settle.
Where to go from here
Go and count what is in your bathroom. If it is more than five things and your skin has become more reactive over the past year, the two facts are probably related.
Take things away before you add anything. It costs nothing and it is the only intervention on this page you can start tonight.