Why Alcohol Sanitisers Dry Skin — And What Barrier Gels Do Differently

Anyone who has used hand sanitiser several times a day knows the feeling: tight, papery skin, sometimes cracked knuckles, occasionally a stinging rawness that no amount of lotion seems to fully fix. This is not imagined, and it is not simply "sensitive skin." It is a predictable, well-documented consequence of how alcohol-based antiseptics work at a molecular level. This article explains the physiology of that damage, what the clinical research actually shows about it, and how a film-forming barrier gel — built from different materials, including chitosan and chelated silver — is designed to interact with skin by a fundamentally different mechanism than an evaporating alcohol solution.

The Skin Barrier You Are Trying to Protect

The outermost layer of skin, the stratum corneum, is often described by dermatologists as a "brick and mortar" structure. The bricks are flattened, dead skin cells called corneocytes. The mortar is a tightly organised matrix of lipids — mainly ceramides, cholesterol, and free fatty acids — arranged in orderly layers between them. This lipid matrix is what keeps water inside the body and irritants, allergens, and microorganisms outside it. It is a genuinely elegant piece of engineering: a few micrometres of tissue doing the work of a waterproof, self-repairing membrane, continuously renewed from beneath. Dermatologists measure how well it is functioning with a simple test called transepidermal water loss, or TEWL — essentially, how much water evaporates from the skin surface. Healthy, intact skin loses very little. Damaged skin loses noticeably more, and TEWL rises before dryness or cracking is even visible to the eye.

How Alcohol Sanitisers Work — and Why the Same Mechanism Harms Skin

Ethanol and isopropanol, typically formulated at 60–95% concentration, kill microorganisms by denaturing proteins and disrupting lipid membranes. This is a blunt, non-specific mechanism — effective precisely because it does not depend on recognising a particular organism, but it does not distinguish between a microbial membrane and the lipid mortar of the stratum corneum either. Ex-vivo skin studies and biophysical research going back decades confirm that alcohols act as solvents for exactly the ceramides and cholesterol that hold the skin barrier together, extracting them with repeated exposure. Compounding this, alcohol evaporates rapidly by design — that is how it delivers its antiseptic effect quickly — and rapid evaporation itself pulls surface moisture away and cools the skin, an effect anyone who has felt sanitiser "flash dry" on their hands has experienced directly. Used occasionally, this is a minor and fully reversible insult. Used a dozen or more times a day, especially without added emollients, the cumulative effect is measurable: rising TEWL, falling skin capacitance (a proxy for hydration), and eventually visible fissuring, redness, and itch — the clinical picture of irritant contact dermatitis.

What the Research Actually Shows

The evidence here is genuinely strong at the mechanistic level and more nuanced at the clinical level. Controlled trials on healthcare worker volunteers, much of it associated with the German hygiene researcher Günter Kampf and published across the Journal of Hospital Infection and American Journal of Infection Control in the early 2000s, used TEWL and skin capacitance measurements to compare repeated alcohol-based hand rubbing against repeated soap-and-water washing. A recurring finding was that well-formulated alcohol rubs containing emollients such as glycerin were often gentler on skin, over repeated use, than frequent washing with soap and water — because surfactants also strip lipids, and the mechanical friction and repeated wetting-and-drying cycle of washing has its own damaging effect on corneocytes. The lesson is not "alcohol is harmless" but that frequency, formulation, and mechanical trauma all interact, and that no method of hand hygiene is free of cost to the skin barrier when used many times daily.

The 2020 rise in hand hygiene frequency gave researchers an unplanned natural experiment. A cross-sectional survey of healthcare workers in Hubei, China, published in a major dermatology journal, found that roughly three-quarters of respondents reported some form of hand skin damage after a marked increase in hand hygiene frequency during that period. This is useful, real-world data, but it should be read with its limitations clearly stated: it was self-reported, cross-sectional rather than a controlled trial, had no comparison group isolating sanitiser from gloves, masks, or washing frequency, and cannot establish precise cause and effect. It corroborates the mechanistic and laboratory evidence rather than replacing it.

What a Barrier Gel Is Designed to Do Differently

A barrier gel is not trying to be a fast-evaporating solvent. Its purpose is to leave behind a thin, flexible film on the skin surface — something closer to a second, temporary layer of "mortar" than a liquid that dissolves the existing one. Rather than increasing transepidermal water loss, a well-designed film-forming layer is intended to reduce it, holding moisture in rather than pulling it out. This is a categorically different mechanism of action: physical and occlusive rather than chemical and solvent-based. Materials used to build such films are chosen for how they behave physically on skin — their flexibility, their water-holding capacity, their adhesion — not for evaporative antiseptic action.

It is worth being explicit here: a topical barrier gel formulated with chelated silver and chitosan, such as GermProof, is a skin-care topical, not an approved drug, and it has not gone through the clinical trial process required for an antiseptic or antimicrobial drug claim. It should not be understood, marketed, or used as something that treats, cures, or prevents any infection or disease. What follows below discusses silver and chitosan as materials — what is genuinely known about their properties from materials science and wound-care research generally — rather than as claims about any specific finished product.

Silver and Chitosan as Materials: What Is Known, and What Is Still Thin

Chitosan is produced by deacetylating chitin, the structural polysaccharide found in crustacean shells and in the cell walls of many fungi — a genuinely elegant reuse of a strong, biocompatible material that nature builds by the ton for its own structural purposes. In materials science literature (journals such as Carbohydrate Polymers and Biomaterials), chitosan is well documented as a film-forming, mucoadhesive polymer with meaningful moisture-retentive properties, which is why it has been incorporated into FDA-cleared hemostatic wound dressings used by emergency responders and the military. That is a device application for controlling bleeding, not a claim about daily skin-care use, but it does establish that chitosan's physical film-forming behaviour is real and reproducible.

Silver has a long documented history in medicine, from Credé's use of silver nitrate in the nineteenth century to silver sulfadiazine in burn units from the 1960s onward and the widespread modern use of silver-impregnated wound dressings. At the bench, silver ions reliably bind sulfhydryl groups in microbial proteins and disrupt membrane function — this in vitro mechanism is uncontroversial and extensively replicated. The clinical picture is more mixed than the lab picture suggests: Cochrane systematic reviews of silver-containing wound dressings have repeatedly found insufficient evidence that they improve infection rates or healing time compared with non-silver dressings, despite the strong laboratory rationale. That gap between clean bench chemistry and messier human outcomes is a useful reminder to keep material properties and clinical claims separate. "Chelation," in this context, simply refers to binding a metal ion to a stabilising molecule to control how and when it is released — a standard technique in materials chemistry for moderating reactivity, not itself a clinical claim.

Hygiene as a Discipline, Not Just a Bottle

None of this argues against hand hygiene — it argues for practising it thoughtfully. Frequency matched to genuine need, proper technique, and attention to the skin's own signals matter more than brand loyalty to any one product. Caring for one's hands is a small but real act of stewardship over a body that was not designed to be stripped and rebuilt several dozen times a day. Families managing their own preparedness — a well-stocked medicine cabinet, basic wound care supplies, sound hygiene habits taught to children — do well to include skin barrier care alongside antiseptic supplies, rather than treating dry, cracked hands as an unavoidable cost of staying clean. People with eczema, healthcare or food-service workers who sanitise dozens of times per shift, and anyone whose hands show persistent redness, fissuring, or pain should raise it with their own physician or a dermatologist, who can assess whether an irritant or allergic dermatitis has developed and advise accordingly. That conversation, between an informed patient and their own doctor, remains the right place for decisions about individual skin care — not a label claim.

Key takeaway: alcohol sanitisers work by dissolving lipids and proteins indiscriminately, which is effective and also inherently drying, while a barrier gel works by forming a physical film that holds moisture in — two different mechanisms, not two strengths of the same one.