What do people get wrong about skincare product names in Japan?
This answer is a draft. It stays unpublished until legal review and source verification are complete.
The English words on Japanese skincare are real English words. They are just not being used the way you expect — and the category behind them is regulated.
The names, decoded
| Japanese | English on label | What it is | What it does |
|---|---|---|---|
| keshōsui (化粧水) | lotion | Thin, watery liquid applied after cleansing | Adds water to the outer skin layer — which then evaporates |
| nyūeki (乳液) | milk | Light moisturiser | Oil content forms a film that slows water loss (transepidermal water loss) |
| biyōeki (美容液) | serum / essence | Concentrated step | Varies by product — read the instructions |
The sequence follows from the chemistry: water first, then oil to hold it. Neither may claim effects outside the 56 permitted claims set by a 2011 Ministry of Health notice.
[Verify] MHLW notice reference (薬食発0721第1号). Confirm before publication.
Misunderstanding 1｜"Lotion" means a creamy lotion
It is not the thick lotion the word suggests in English.
Misunderstanding 2｜"Milk" is a cleanser
"Milk" (*nyūeki*) is a moisturiser. A separate cleansing milk also exists — read the rest of the pack.
Misunderstanding 3｜"Essence" and "serum" are interchangeable
*Biyōeki* is labelled either way, and usage differs. The instructions, not the word, tell you where it goes.
Misunderstanding 4｜The order is obvious from the names
The names do not encode the sequence. The pack states where the product belongs.
Misunderstanding 5｜These products "lock in" moisture
Water-based products add moisture; oil-based products slow its loss. Neither locks anything. The measurable quantity is transepidermal water loss, and it is the oil step that lowers it.
---
Sources
- Ministry of Health, Labour and Welfare, notice on the scope of cosmetic efficacy claims (薬食発0721第1号, 21 July 2011)
https://www.mhlw.go.jp/file/06-Seisakujouhou-11120000-Iyakushokuhinkyoku/kesyouhin_hanni_20111.pdf
- Society of Cosmetic Chemists of Japan — glossary, "transepidermal water loss"
https://www.sccj-ifscc.com/library/glossary_detail/487
- Japan Cosmetic Industry Association
https://www.jcia.org/
⚠️ Editorial note: the source URLs above were identified by search. Our working environment cannot reach go.jp domains, so the contents have not been checked against the text. Verify every source before publication and record who checked it and when.
About this article
What we share here are ideas and everyday practices passed down among people living in Japan, together with general information drawn from public sources. They are not official recommendations, and they are not professional instruction. Practices vary between households and regions.
This is general information. Results vary from person to person and depend on your own conditions and surroundings.
Please decide for yourself, using your own judgement, whether any of this suits your situation. We cannot accept responsibility for any damage, loss or injury arising from following this article.
Cosmetics are not intended to treat or prevent any condition. Always follow the instructions on the product. If you notice any irritation, stop using the product and consult a dermatologist.
Sources
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