Skin barrier biology
Mechanism-first writing on skin barrier biology, grounded in primary literature. No routines, no product recommendations. The biology that explains what symptoms can only describe.
the book
A biochemist’s guide to
barrier biology, damage & repair
A mechanism-first synthesis of epidermal barrier biology for scientifically curious readers and skin professionals that sits between popular skincare advice and clinical dermatology texts.
From Chapter 7
Petrolatum illustrates this principle with unusual clarity because it does so little. It contains no active ingredients, no ceramides, no signalling molecules, no growth factors. It simply occludes. And in doing so reliably, it produces a rapid, substantial reduction in TEWL.
The Damaged Skin Barrier
Skin barrier biology
The physical architecture of the stratum corneum. Corneocytes embedded in an organised lipid matrix, held together by corneodesmosomal adhesion. The cells are built during epidermal differentiation over the course of weeks. What gets in and what stays out is determined here.
The biochemical operating systems that keep structure functional. pH, enzyme activity, ionic gradients, microbial balance. These are the conditions under which the barrier can maintain and repair itself. When they shift, structure starts to work against itself.
The cumulative biochemical, environmental and systemic load placed on the first two. Surfactants, UV exposure, hard water, cortisol, circadian disruption and stacked actives. Pressure determines whether the barrier is adapting or beginning to fail — and most people never account for it.
I hold a First Class MBiochem from Cardiff University, with research grounded in TNF-family and apoptotic signalling in cancer models, and the biology of how tissues respond to pressure. The skin barrier is one expression of those principles, not the last.
I wrote The Damaged Skin Barrier because it was the book I was looking for when my own skin became reactive and unstable. It didn’t exist. Every resource told me what to apply. None explained why things had changed.
Education
MBiochem · First Class · Cardiff
Research
European Cancer Stem Cell Research Institute
focus
Epidermal biology · lipid biochemistry
Based
Cardiff, South Wales
Contradictions resolve into patterns
What looks like unpredictable behaviour often turns out to be the same regulatory process expressed under different conditions.
Product chasing stops being the default
When you can read what the skin is responding to, the pull to reach for the next serum stops being the default response.
Skin is treated as a system
Not a list of symptoms to suppress, or a label to match to a product, but a set of processes with their own timing and logic.
Platform index
The platform is built around a growing archive of mechanism-first articles, a forthcoming book, and a fully cited reference framework. Here is where it currently stands.
/ 01
The Book
/ 02
Articles
/ 03
References
/ 04
Clinics
/ 05
Future work
Skin barrier biology
The approach
/ 01
Skin behaviour explained through biology, regulation, and pressure. Not product folklore, trend-driven routines, or the vague language that benefits nobody except the people selling the next step.
/ 02
The goal isn’t another shopping list. It is a clearer way to interpret what your skin is responding to, so the decisions you make rest on something sturdier than guesswork.
/ 03
Better decisions come from clearer models, not louder advice. The barrier is a system. Treating it like one changes what you notice and what you stop reacting to.
From Chapter 7
Petrolatum illustrates this principle with unusual clarity because it does so little. It contains no active ingredients, no ceramides, no signalling molecules, no growth factors. It simply occludes. And in doing so reliably, it produces a rapid, substantial reduction in TEWL.
The Damaged Skin Barrier
Current Output
No routines. No product lists. Just the biology behind why your skin behaves the way it does.
For anyone tired of guessing, overspending, and advice that never actually explains what is going on beneath the surface.
Eleven chapters, one framework, and the working assumption that you would rather understand the system than be sold the next step in it.
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