Skincare is the category where marketing has drifted furthest from chemistry. Products are sold on ingredient stories — what is absent, what botanical is featured — while the things that actually determine whether a formula suits you sit further down the label.
The useful skill is not memorising a list of villains. It is being able to read an ingredient list and work out what a product is, what it does, and whether the marketing claim survives contact with the formula.
The short answer
Use fewer products. Prioritise fragrance-free. Focus your attention on leave-on items rather than anything you rinse off. A gentle cleanser, one moisturiser, and a sunscreen is a complete routine for most people.
Leave-on is where it matters
Contact time is the variable that should drive your decisions, and it varies enormously across a bathroom shelf.
A cleanser is on your skin for perhaps sixty seconds before it goes down the drain. A night cream is on for eight hours, on skin that is warm and occluded. Those are not comparable exposures, and treating them as equally important is how people end up spending a lot of money changing the wrong products.
- Highest priority: moisturiser, serum, sunscreen, lip balm, eye cream, body lotion, anything used on a baby.
- Moderate: makeup worn all day, hand cream.
- Lowest: cleanser, body wash, masks you rinse, exfoliants.
How to read the ingredient list
The order is meaningful, up to a point
Ingredients are listed in descending order of concentration down to one percent. Below that threshold, they can appear in any order.
So the first five ingredients are the product, in a real sense. Anything sitting after the preservatives and fragrance is present in small amounts — which is worth remembering when a brand builds its entire identity around a botanical extract that appears second from the bottom.
The exception is that some genuinely active ingredients work at low concentrations. Retinoids and peptides are effective in small amounts. Position tells you quantity, not importance.
The names are standardised
Cosmetic labelling uses INCI names, which are consistent internationally. This is why the same ingredient can look alarming or wholesome depending on which name a brand chooses to feature.
“Tocopherol” is vitamin E. “Sodium chloride” is salt. “Aqua” is water. A long chemical-sounding name tells you nothing about safety — it tells you the ingredient has a formal name, which all of them do.
What to actually look out for
- “Fragrance” or “parfum.” The single most valuable thing to remove. It is a trade-secret exemption covering potentially dozens of undisclosed components, and it is the leading cause of cosmetic contact allergy.
- Formaldehyde-releasing preservatives. DMDM hydantoin, diazolidinyl urea, imidazolidinyl urea, quaternium-15. They preserve by slowly releasing formaldehyde.
- Methylisothiazolinone (MI/MCI). A potent sensitiser that caused a significant wave of contact allergy. Better in rinse-off than leave-on, and best avoided in leave-on entirely.
- Denatured alcohol high in the list. Not dangerous, but drying and irritating for many people when it appears in the first few ingredients.
- Undisclosed ethoxylated ingredients (PEGs, -eth compounds), where 1,4-dioxane can persist as a manufacturing contaminant. Established brands purify for it.
Claims that mean nothing
- “Hypoallergenic” — no legal definition and no testing requirement whatsoever.
- “Dermatologist tested” — confirms a dermatologist was involved. It does not tell you what the test concluded.
- “Unscented” — frequently contains masking fragrance to cover the base odour. “Fragrance-free” is the term you want.
- “Chemical-free” — meaningless. Water is a chemical.
- “Clean” and “non-toxic” — retailer marketing standards, each defined by the retailer.
- “Dermatologist recommended” — a survey result, not a safety finding.
Natural is not a safety category
This is worth stating plainly, because it runs against the grain of how these products are sold.
Essential oils and botanical extracts are among the most common causes of allergic contact dermatitis in cosmetics. Citrus oils can cause photosensitivity. Meanwhile many synthetic ingredients — glycerin, hyaluronic acid, most silicones, mineral-based UV filters — are inert, extremely well studied, and very well tolerated.
Origin is a poor proxy for safety. The specific ingredient, its concentration, and how your own skin responds are what matter.
Simplify before you substitute
The cheapest improvement available in this category is owning fewer products, not replacing each one with a pricier version.
Most routines contain redundancy: three products doing the same job, layered because each was bought separately. Every product you remove is one less exposure, one less expense, and — usefully — one less variable when something irritates you and you are trying to work out what.
If you are simplifying, cut in this order: anything you cannot articulate a purpose for, anything fragranced, anything that has been open longer than a year.
Patch testing, properly
Apply a small amount to the inner forearm or behind the ear, twice daily for seven to ten days. Reactions to sensitisers frequently take days to appear, which is why a single application tells you very little.
Introduce one new product at a time and wait a couple of weeks. Adding three at once guarantees that if something goes wrong, you will not know which one caused it.
Frequently asked questions
Are parabens something to avoid?
This is more contested than either side suggests. Parabens are effective, well-studied preservatives, and regulatory bodies broadly consider the common ones safe at permitted levels. Some people prefer to avoid them anyway. What is worth knowing is that paraben-free products need some other preservative, and the replacements are occasionally more sensitising.
Do I need a separate product for every step?
No. Elaborate multi-step routines are a marketing construction more than a dermatological necessity. Cleanser, moisturiser, sunscreen covers the fundamentals. Add targeted actives only for a specific concern you actually have.
Is mineral sunscreen better than chemical?
Zinc oxide and titanium dioxide sit on the skin rather than absorbing, and are less likely to sting or sensitise — which makes them a sensible default for reactive skin. But the best sunscreen is overwhelmingly the one you will actually apply generously and often. An unused mineral sunscreen protects nothing.
Does skincare need to be expensive to be good?
No. Price correlates far more with packaging, marketing, and texture than with formulation quality. Many inexpensive products use the same well-established actives at comparable concentrations.
Keep going
This is one section of the Non-Toxic Personal Care Guide, which also covers deodorant, haircare, and oral care.