Which vitamin & supplement brands do AI assistants recommend in Japan? Q4 2026
In Japan, AI assistants most often recommend DHC, Fancl and Meiji for vitamins. DHC is named by 5 of 5 assistants.
What the data says
DHC (DHC Corporation) is the vitamin & supplement brand AI assistants recommend most in Japan, taking 29.8% of all recommendation points across 5 assistants. Fancl follows with 22.4% and Meiji is third with 7.3%.
DHC's lead over Fancl is 7.4 points, a clear advantage in how AI shortlists the category.
Every assistant tested (ChatGPT, Claude, DeepSeek, Gemini and Grok) puts DHC first.
The top five brands hold 71% of recommendations out of 45 brands named in total, leaving room for challengers to break into AI shortlists.
| # | Brand | Owner | AI share | ChatGPT | Claude | DeepSeek | Gemini | Grok |
|---|---|---|---|---|---|---|---|---|
| 1 | DHC | DHC Corporation | 29.8% | 275 | 305 | 350 | 235 | 325 |
| 2 | Fancl | Fancl | 22.4% | 265 | 198 | 245 | 181 | 232 |
| 3 | Meiji | Meiji | 7.3% | 91 | 43 | 197 | – | 35 |
| 4 | Asahi | Asahi | 6.2% | 85 | 195 | – | – | 32 |
| 5 | Shiseido | Shiseido | 5% | 40 | 106 | 20 | 25 | 60 |
| 6 | Orihiro | Orihiro | 4.4% | 156 | – | 32 | – | 32 |
| 7 | Suntory | Suntory | 4.1% | 40 | – | 88 | 78 | – |
| 8 | Kobayashi | Kobayashi Pharmaceutical | 3.4% | – | – | – | 60 | 108 |
| 9 | Blackmores | Blackmores | 2.3% | – | – | – | – | 116 |
| 10 | Rohto | Rohto Pharmaceutical | 1.3% | 20 | – | – | 47 | – |
| 11 | Asahi Dear-Natura | Asahi | 1% | – | – | – | 48 | – |
| 12 | Taisho | Taisho | 1% | – | 48 | – | – | – |
| 13 | Chocola BB | Eisai | 0.9% | – | – | – | 43 | – |
| 14 | Dear-Natura | Asahi | 0.7% | – | 37 | – | – | – |
| 15 | Centrum | Haleon | 0.7% | – | – | – | – | 35 |
| 16 | Angfa | Angfa Co., Ltd. | 0.7% | – | – | – | 35 | – |
| 17 | Meiji Savas | Meiji | 0.7% | – | – | – | 35 | – |
| 18 | Yamamoto Kanpoh | Yamamoto Kanpoh | 0.7% | – | – | – | 35 | – |
| 19 | Kirkland | Costco | 0.6% | – | – | 28 | – | – |
| 20 | Ensure | Abbott | 0.5% | – | – | – | – | 25 |
Questions about AI vitamin & supplement recommendations
- Which vitamin & supplement brand does ChatGPT recommend most in Japan?
- ChatGPT recommends DHC most often for vitamin & supplement in Japan. Across all assistants, DHC leads with 29.8% of recommendations.
- Which vitamin & supplement brand is improving fastest in Japan?
- Rohto has the strongest momentum among challengers: AI names it first in 1 of 3 answers where it appears, while holding 1.3% share. This is the first Q4 2026 reading; change over time will be shown from the next update.
- How is the ranking calculated?
- We ask each AI assistant the questions shoppers ask in each category and market, record the top five brands it names, and give 35, 25, 20, 12 and 8 points for positions one to five. Share is a brand's points divided by all points awarded.
Vitamins: AI rankings by country
Covers: Bone & Joint Supplements, Brain & Eye Supplements, Detox Supplements, Fat Burning Supplements, Hair Supplements, Heart Supplements, Mineral Supplements, Multivitamins, Nutritional Supplements, Skin Supplements.
Method: each AI assistant is asked the shopper questions for every segment in the category and market; the top five brands named score 35, 25, 20, 12 and 8 points. Share is a brand's points divided by all points awarded. Rankings reflect AI answers, not sales.
See how your brand ranks in AI answers.
Get a free report: where AI names you, where it leaves you out, and the product page, pack and message fixes that change it.