If your category touches health, money or legal standing, there is an unwritten requirement in Japanese search that many foreign companies do not discover until their content has already failed: somebody qualified has to put their name on it.
Not a byline. A named professional with a stated license, identified as having reviewed the content. In Japanese this is called 監修 (kanshū), usually translated as “supervision,” and in Japanese YMYL categories it tends to function as an entry condition rather than a nice-to-have.
What this looks like on the page
Open any competitive Japanese page about a medical symptom, a tax question or an insurance product. Near the top or the bottom you will usually find a block containing a person’s real name, their qualification, often their affiliation, frequently a photograph, and a line saying they supervised the article.
That person is usually not the writer. The writer researched and drafted; the supervisor checked it against professional standards and accepted responsibility for its accuracy. Both are named, and the distinction between them is stated.
English-language YMYL content has a weaker version of this — “medically reviewed by” appears on the larger health publishers — but in Japan it tends to extend much further down the market, into ordinary company blogs and mid-sized media, and it covers categories that Western sites rarely treat this way.
Which categories this actually covers
Broader than many foreign teams assume. The obvious ones are medical and financial, but in practice the convention reaches:
- Health, medicine, supplements, fitness, mental health — physicians, pharmacists, registered dietitians, licensed therapists.
- Money — tax accountants, certified financial planners, licensed insurance and securities professionals.
- Legal and administrative — lawyers, judicial scriveners, administrative scriveners, labor and social security consultants. Japan has a dense system of specialized licenses, and many readers know the differences.
- Property, employment, childcare, education — often supervised even though they sit outside a strict YMYL reading.
- Cosmetics and food — where the constraint is regulatory as much as editorial. Japan’s pharmaceutical and food labeling rules limit what may be claimed, and in our view the safest route is review by someone who knows those limits.
In our experience, that last group catches foreign companies most often, because the equivalent English content is written freely and the Japanese version cannot be.
One rule catches companies that do arrange supervision. For drugs, quasi-drugs, cosmetics and medical devices, Japan’s advertising standard bars any advertisement saying that doctors, pharmacists, beauticians, hospitals or similar bodies recommend, approve or choose the product. The health ministry’s commentary adds that this applies even when the recommendation is true (MHLW commentary on the advertising standard, September 29, 2017, item 4-10, in Japanese).
A brand’s own article counts as an advertisement when it is meant to sell, names the product and is open to the public. Those are the three tests set out in a 1998 ministry notice (in Japanese). On such a page, a doctor named as supervisor can be read as that kind of recommendation. Keep supervision on informational pages that check claims, and keep the doctor’s name off pages that sell the product. Supplements and other foods are covered by different rules, so check those separately.
Why it is rarely optional in practice
Google does not have a rule that says Japanese health pages need a named physician. The mechanism is indirect, and it is worth understanding rather than taking on faith.
- The pages that already rank tend to have it. Whatever the cause, the competitive set in Japanese YMYL is mostly supervised content. Arriving without it means competing against pages that carry a trust signal you do not.
- Many Japanese readers look for it. This is a market where the identity of the person making a claim is examined. An unattributed health claim can read as an advertisement.
- It can carry over into AI answers. A page that names a qualified reviewer gives a machine something to attach the claim to. Increasingly, we think that matters as much as ranking.
- It is a regulatory safety net. In cosmetics, food and finance, the supervisor is often the person who catches the sentence that could not legally be published.
What it costs and how it is arranged
We produce over 3,000 Japanese articles a year, and in regulated categories more than 250 qualified professionals — physicians, tax accountants and others — supervise that output. A few practical observations from running it at that scale.
- It is a per-article fee, not a retainer, in most arrangements. Budget it as a line item on every piece in the category, not as a one-off.
- The supervisor is not the writer, and in our view should not be. Asking a physician to write costs far more and usually produces worse content. The division we find most efficient is: researcher and writer produce, supervisor reviews and signs.
- Lead time is usually the constraint, not money. Review cycles add days. A publishing schedule built without them is likely to slip.
- Matching the license to the claim matters. A general physician supervising a dermatology article is weaker than a dermatologist, and many Japanese readers in the category can tell.
Mistakes we see foreign companies make
| What gets tried | Why it tends to fail |
|---|---|
| Using the global medical reviewer from headquarters | A foreign license is not read as authoritative by most Japanese readers, and may not satisfy the regulatory point at all. |
| Naming the Japanese country manager as the expert | A job title is not a qualification. Readers tend to notice the difference quickly. |
| “Reviewed by our medical team” | In our experience, unnamed collective attribution carries almost no weight here. The convention is a person. |
| Adding supervision only to the top pages | Inconsistent treatment within one site tends to read as decoration rather than process. |
| Translating supervised content from another market into Japanese | The supervisor signed off on the original context and the original regulations. Neither transfers. |
If you cannot arrange supervision
Then do not publish in the regulated part of the category, and say so internally rather than quietly lowering the standard.
There is usually a workable adjacent space. A supplement company that cannot yet arrange medical supervision can still publish about sourcing, manufacturing, company practice and product use, none of which needs to make a health claim. That content can rank, build the entity, and keep you out of a position you cannot defend.
Publishing unsupervised YMYL content in Japanese is one of the few shortcuts in this market with a genuine downside beyond wasted budget.
Common questions
Is supervision legally required?
Not as a general rule. What is legally constrained is what you may claim, particularly in cosmetics, food and finance. Supervision is the practical mechanism many companies use to stay inside those limits while also meeting reader expectations.
Can one supervisor cover a whole site?
Only within their field. Spreading a single name across unrelated topics tends to weaken the signal and invite the obvious question.
Does the supervisor need a public profile?
In our experience, it helps considerably. A name that resolves to a real, verifiable person — a clinic, a firm, a professional register — is worth more than a name alone, to readers and to machines.
We are B2B. Does this apply?
If you write about money, law or employment obligations, yes. B2B does not exempt a category from being YMYL.
Working on Japan?
Nihongo Search is published by Amanaut, Inc., a small Japanese SEO and content company in Tokyo working with companies entering the Japanese market. We produce over 3,000 Japanese articles a year, with more than 250 qualified professionals supervising content in regulated categories, so the arrangements above are ones we run rather than describe. The wider sequence is in our guide to SEO in Japan, and the writing standard in writing Japanese SEO content. More about how we work.
Last reviewed: October 2026.
