How to read a skincare label without being fooled
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The short answer
How do you read a skincare ingredients list?
Ingredients are listed in descending order of weight down to 1%, after which they can appear in any order, so the first few tell you what the product mostly is and an active listed near the end is present in a small amount.
Evidence: Strong How we grade evidence
Everything on a cosmetic package is either legally required or chosen by the marketing department. It is useful to know which is which.
What order are ingredients listed in on a skincare label?
Ingredients are listed in descending order of weight until you reach those under 1%, which the cosmetics regulation on labelling allows to be listed in any order. So the first five tell you what the product mostly is, usually water, a few emollients and a thickener, and everything after that could be anywhere between meaningful and a token dusting. If the star active appears after the preservative, it is present in a very small amount.
Does a higher percentage on the front mean a stronger product?
No, a percentage tells you how much of an ingredient is in there, not how much is doing anything. A well-formulated lower strength at the right pH can outperform a poorly formulated higher one, and more is not always better: in one study comparing 0.3% and 1% retinol, the two strengths remodelled skin similarly in a lab model, and the lower one caused fewer reactions in daily use. Vitamin C is the extreme case: the form, the pH and the packaging matter more than the number, and an oxidised orange serum is doing nothing whatever it says on the box.
What claims are cosmetics allowed to make?
Cosmetics cannot be presented as treating or preventing disease: under the Human Medicines Regulations 2012, a product presented that way is a medicinal product and is regulated as one. That is why benzoyl peroxide for spots is sold as a medicine, and why topical retinoids for acne need a prescription. The cosmetics rules on product claims say a label must not imply a product has characteristics or functions it does not have, and the common criteria for cosmetic claims require every claim to be backed by adequate and verifiable evidence. Words like dermatologically tested mean a test happened, not that it found anything in particular. The regulation does not define hypoallergenic, natural or clean, so read them as marketing rather than a promise.
How is fragrance shown on a skincare label?
Fragrance appears as parfum or aroma, but certain fragrance allergens, such as limonene and linalool, must also be named separately once they exceed 0.001% in a leave-on product or 0.01% in a rinse-off one. The EU has added 56 more fragrance allergens to its labelling list, and new products placed on the EU market have had to name them since 31 July 2026, so you may see longer lists. Airless pumps and opaque tubes suggest the formulator cared about stability, which matters for vitamin C and retinoids. A short list is not automatically better, but a list you can read is easier to judge.
How does MyAgenix use ingredient lists?
MyAgenix reads the published ingredients list where we hold one, which is how our fragrance-free and essential-oil-free filters work. Where we do not hold one, we say we do not know rather than guessing, which is why some products show as unknown. A MyAgenix read uses the same lists to show which products leave out what you want to avoid.
Questions people ask
What does free from mean on a skincare label?
It means the maker says the product does not contain that ingredient. The common criteria for cosmetic claims say a product should not be sold as special for meeting a minimum legal requirement, and claims should not run down ingredients that are legally used. Free from tells you what is left out, not that the product is gentler.
What does the open jar symbol on a skincare product mean?
It shows the period after opening: how many months the product is safe to use once you have opened it, written as a number followed by M. Products that keep for a long time unopened carry this symbol instead of a date of minimum durability. Write the date you opened it on the pack if you tend to forget.
Why are some ingredients on a skincare label in Latin?
Ingredients are listed by their standard common ingredient names, the same across countries, so plant extracts appear under their Latin botanical names and water often appears as aqua. It looks technical, but it means the same ingredient has the same name wherever the product is sold.
Does nano in brackets on an ingredients list mean something is wrong?
No. The rules require any ingredient present as a nanomaterial to be followed by the word nano in brackets, so you can see it. It is a labelling requirement, not a warning, and it can appear next to mineral sunscreen filters such as titanium dioxide or zinc oxide.
Sources
- cosmetics regulation on labelling (legislation.gov.uk)
- one study comparing 0.3% and 1% retinol (pubmed.ncbi.nlm.nih.gov)
- Human Medicines Regulations 2012 (legislation.gov.uk)
- benzoyl peroxide for spots is sold as a medicine (nhs.uk)
- topical retinoids for acne need a prescription (nhs.uk)
- cosmetics rules on product claims (legislation.gov.uk)
- common criteria for cosmetic claims (legislation.gov.uk)
- certain fragrance allergens, such as limonene and linalool (legislation.gov.uk)
- added 56 more fragrance allergens to its labelling list (ec.europa.eu)
General information about skin, not medical advice. MyAgenix offers cosmetic guidance to help you choose products. It does not diagnose or treat any condition. For anything that needs treating, see a pharmacist, your GP or a dermatologist.