Editorial policy
Every article is based on cited sources, is reviewed before it goes live, and shows when it was last updated.
Who writes our articles
Articles are written by KW Cosmetic Content Team. Each article shows its author, the date it was first published and the date it was last updated. We never claim an expert review that did not happen.
How we use evidence
- Key facts come from research papers and from medical societies and public agencies, and every source is listed at the end of the article under "Sources".
- Numbers are copied with the same precision as the original source.
- Videos and community posts only help us find the questions readers ask. We never cite them as evidence.
- Results from tests on a raw ingredient are not presented as results for a finished product, and we note that they apply to the ingredient only.
Evidence grades
Right below each article title, we show the mix of evidence, the review date, and the next scheduled review (six months after the review date).
| Label | Meaning |
|---|---|
| Evidence grade A | Mostly systematic reviews and randomized controlled trials |
| Evidence grade B | Mostly observational studies and small trials |
| Evidence grade C | Preliminary studies and ingredient-level tests |
| Evidence grade Institutional | Guidance from medical societies and public agencies |
| Evidence grade Mixed | Evidence across several grades |
| Evidence grade Limited evidence | General information |
How articles are structured
The first paragraph answers the question directly. After that come a table of key facts, the main text, frequently asked questions, and sources. Product information from the operator appears only in some articles, once, at the end, and lists only facts such as ingredients, amounts, test results and price.
The English edition
English articles are adapted, not just translated, from Korean articles on the same topic. The facts, figures and sources stay the same; titles, headings and questions are rewritten in the words English-speaking readers actually search for.
Wording review
Before an article goes live, we review its wording against cosmetics labeling and advertising rules. For the English edition we also follow U.S., EU and UK rules: we explain skin conditions as information, but we never describe a cosmetic as treating, curing or preventing a disease. If symptoms are severe or last a long time, we suggest seeing a dermatologist.
Updates and corrections
When new evidence appears or an error is found, we correct the article and change its last-updated date.A channel for reporting errors is being set up.