What are the common misunderstandings about reading cosmetic ingredient lists?
This answer is a draft. It stays unpublished until legal review and source verification are complete.
Since 2001 every cosmetic sold in Japan has had to list all of its ingredients, so packaging carries dozens of names — in Japanese. Where to look, and whether the order means anything, are questions asked in Japan and abroad alike. This article explains the Japanese rules and how to use the list even if you cannot read every word.
The labelling rules
| Rule | Detail |
|---|---|
| Full ingredient labelling | Mandatory since April 2001 (Article 61 of the Pharmaceuticals and Medical Devices Act, Japan's cosmetics and drugs law). Every ingredient must be listed |
| Order | Descending order of amount. However, ingredients at 1% or below may appear in any order. Colourants are grouped at the end |
| Ingredient names | The Japan Cosmetic Industry Association (JCIA) "labelling names for cosmetic ingredients" (Japanese names based on INCI). Examples: water (水), glycerin (グリセリン), BG (butylene glycol), ethanol (エタノール) |
| Quasi-drugs (医薬部外品, a Japanese category between cosmetics and medicines) | Active ingredients are listed first under "active ingredients" (有効成分), the rest under "other ingredients" (その他の成分). Full labelling is a voluntary industry standard (most makers follow it) |
| Carry-over ingredients | Trace preservatives and similar contained in a raw material need not be listed (they are there to stabilise the raw material) |
| "Additive-free" (無添加) and "-free" (フリー) | No legal definition (see the article on additive-free claims) |
How to read it
| Where to look | What it tells you |
|---|---|
| First 3–5 lines | The product's base (water, glycerin, BG, ethanol, oils). If ethanol is near the top, it is a light, refreshing type, and some people feel it sting |
| Middle | Moisturising and skin-conditioning ingredients, thickeners, emulsifiers |
| 1% or below (latter part) | Fragrance, preservatives (phenoxyethanol, parabens) and most of the advertised "hero" ingredients (〇〇エキス, "… extract") |
| End | Colourants (赤〇号 "Red No. X", 黄〇号 "Yellow No. X", iron oxides) |
[Verify] Check the legal basis for labelling and its exceptions (order of ingredients at 1% or below, carry-over) against the Ministry of Health, Labour and Welfare notices (Iyakushin-hatsu No. 163 and others) and JCIA material.
Misunderstanding 1｜A product with many ingredients is risky
The number of ingredients and irritation are unrelated. Knowing one ingredient that does not suit you is more useful. Photograph the ingredient list of any product that gave you a rash and take it to a dermatology clinic (covered by Japanese health insurance) — it helps identify the cause.
Misunderstanding 2｜The "contains X extract" in the advert is the main ingredient
Most such ingredients appear in the latter, 1%-or-below part of the list. The claim is true as far as the label goes, but the amount is usually small. The top 3–5 lines are the substance of the product.
Misunderstanding 3｜The English INCI name and the Japanese label name are different ingredients
They are the Japanese names for the same ingredients (e.g. Butylene Glycol = BG, Tocopherol = トコフェロール). When comparing with products from home, use the JCIA correspondence table.
Misunderstanding 4｜"Alcohol-free" means there is no ethanol in it
In cosmetics "alcohol" usually means ethanol, but stearyl alcohol and behenyl alcohol (fatty alcohols, in practice oils) are different substances and are sometimes outside the scope of a "-free" claim. Look at where ethanol sits in the list.
Misunderstanding 5｜Reading the list tells you how well it works
What you learn is the composition; how much effect you get depends on the amounts, the formulation and your skin. Reading the list in order to avoid ingredients is the practical use that dermatology clinics also recommend.
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Sources
- Ministry of Health, Labour and Welfare, "Full ingredient labelling of cosmetics" [化粧品の全成分表示について] (Article 61 of the Pharmaceuticals and Medical Devices Act, in force from 2001)
https://www.mhlw.go.jp/stf/seisakunitsuite/bunya/kenkou_iryou/iyakuhin/keshouhin/index.html
- Japan Cosmetic Industry Association, "List of labelling names for cosmetic ingredients" [化粧品の成分表示名称リスト]
https://www.jcia.org/user/business/ingredients
- Japanese Dermatological Association, "Dermatology Q&A: Cosmetic contact dermatitis" [皮膚科Q&A 化粧品かぶれ]
https://www.dermatol.or.jp/qa/
⚠️ 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 medicines and are not meant to diagnose, heal or prevent any condition. If your skin reacts, stop using the product and see a dermatologist.
Sources
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