Skin, face & hair
Understanding what goes on your skin.
Your skin is your largest organ and the one you make the most daily decisions about. This page covers what it actually does, what gets absorbed and what does not, and how to read a label without a chemistry degree.
Written for anyone standing in front of a shelf of products making claims they have no way to check.
A barrier, not a sponge
Absorption depends on the molecule, not the marketing.
Read the first six lines
That is where most of the formulation sits.
Not a safety category
Natural tells you origin, not whether it suits you.
Image placeholder - slot 04b
Mobile, 1080 x 1350 portrait, JPEG q75 under 300KB. Same scene as 04a, recomposed vertically rather than cropped from the landscape file.
01 · The problem
The label tells you everything except what you want to know.
Ingredient lists are written in a naming system designed for regulators, not for shoppers. So people fall back on shortcuts: avoid the long words, trust the ones that sound like plants, buy whatever the internet is worried about this month.
Those shortcuts do not work. Water is a chemical. Plenty of plant extracts are potent irritants. A long name often just means a well-characterised molecule. Meanwhile the things that make the biggest difference to skin get very little attention, because nobody has a product to sell you for them.
Who is writing this
We used the same shortcuts.
Avoid the long words, trust anything that sounds like a plant, replace whatever the internet is worried about this month. We did all of that before learning that none of it is a reliable guide to anything.
We are not doctors or dermatologists and we do not pretend to be. What we can do is separate what has been tested in people from what has been tested in a dish, say how large and how long the studies were, and tell you plainly where the evidence stops. Where something is genuinely unresolved, we say so rather than picking a side.
How this works
Discover. Understand. Explore. Choose.
The same four steps on every page of this site, in that order. You are somewhere in the middle of them right now.
01
Discover
Find out the question is more interesting than you were told.
02
Understand
See what the evidence supports, and where it runs out.
03
Explore
Ask the person who sent you here to walk you through it.
04
Choose
Decide for yourself, with no pressure and no deadline.
02 · Why it matters
Skin is a barrier, not a sponge.
The outermost layer is a wall of flattened cells held together by lipids. Its job is to keep water in and keep most things out, and it is good at it. Absorption is not all-or-nothing: it depends on molecule size, how fat-soluble the substance is, how long it stays in contact, and where on the body it sits. Thin skin behaves differently from the soles of your feet.
That is why the two claims you hear most often are both wrong. Nothing you put on your skin goes straight into your bloodstream, and it is not true that nothing gets through at all. The interesting question is always which substance, in what amount, and where.
03 · What the evidence says
Sorted by how much is actually known.
Established
Sun exposure and barrier care
Cumulative ultraviolet exposure is the best understood driver of skin ageing and of skin cancer risk. Gentle cleansing and consistent moisturising support the barrier. This is the settled ground, and it is unglamorous.
Reasonably supported
A small number of actives
A handful of ingredients have been studied in people repeatedly and hold up. Much of the rest of the category has been tested mainly in laboratory models, often at concentrations a finished product rarely contains.
Often overstated
Natural as a safety category
Natural origin tells you where a substance came from, not whether it suits your skin. Some of the most common contact allergens are plant-derived essential oils. Evaluate on evidence, formulation, quality and appropriate use, not on provenance.
This is an area of active research. Some of the studies referenced here are early, small, or conducted in laboratory or animal models rather than in people. We have said so wherever that is the case.
04 · The options
Three routes, none of which requires you to throw out what you already own. Simpler formulations and fewer unnecessary additives are a reasonable direction of travel, not an emergency.
Simplify the routine
Fewer products, used consistently, applied to skin that is not already irritated. A shorter routine also makes it possible to tell what is working, which a twelve-step one never does.
What it will not do: change your genetics or your age.
Mindful ingredient selection
Learning to read the first five or six entries on a list, which is where most of the formulation sits, and noticing what your own skin reacts to. Reducing unnecessary exposure where there is a reason to, rather than across the board.
What it will not do: make a product suitable for everyone.
Water and bathing
Water temperature, how long you spend in it, and what is in your supply all touch the barrier before any product does. It is the most-used substance in the routine and the least examined.
What it will not do: treat a diagnosed skin condition.
05 · The limits
When this is the wrong page.
A mole that changes shape, size or colour, a sore that does not heal, a rash that spreads or comes with a fever, or any skin change that worries you belongs with a doctor, not with a routine. Eczema, psoriasis, rosacea and acne are medical conditions with real treatments, and a gentler cleanser is not a substitute for them.
Nothing applied to skin treats, cures or prevents disease. Where skin is a window onto something happening elsewhere in the body, the answer is a diagnosis, not a different bottle.
What is at stake
A decision you make every single day.
If you understand it
A short routine you can actually evaluate, the ability to read the first six lines of a label, and no more buying on the strength of a word on the front.
If you do not
A cupboard of half-used products, a routine so long you cannot tell what is working, and money following whichever ingredient is currently unpopular.
Keep reading
There is no rush, and nothing to sign up for.
If this was useful, these three are the natural next reads. Everything is free and nothing asks for your name.
Talk to your consultant to learn more.
The information on this page is for education only. It is not medical advice, and it is not a diagnosis or a treatment. Always speak to your doctor before changing anything about your care, and never stop prescribed medication without medical guidance.