Who owns One A Day?
One A Day is owned by Bayer (Germany, XETRA: BAYN).[1]
This ownership is reported in official statements but has not yet been matched to a regulatory filing.
Evidence: Bayer AG Annual Report 2025, 10 March 2026. Last checked .
Key facts
- Current owner
- Bayer AG reported
- Owner HQ
- 🇩🇪 Germany, Leverkusen
- Origin
- 🇺🇸 United States
- Founded
- 1940
- Category
- Food › Nutrition & supplements › Vitamins & supplements
- Parent ticker
- XETRA: BAYN
- Last verified
- · 1 sources
About One A Day
One A Day is an American multivitamin brand launched in 1940 on the proposition that a single daily tablet was enough, at a time when supplements were taken several times a day. It is one of the two largest multivitamin brands in the United States alongside Centrum.
Ownership timeline of One A Day
Where One A Day sits in Bayer
Controlling ownership as of . Brands grouped under the entity that owns them; large groups are collapsed.
Open the full Bayer ownership tree →
See the full Bayer brand portfolio (9) →
Other brands owned by Bayer
Bayer controls 9 brands on Brandtree, 3 of them in food.
Also in food
Founded in the 1940s
- Bepanthen (1944)
Other brands in vitamins & supplements, and who owns them
The 45 brands in vitamins & supplements on Brandtree belong to 30 owners. The largest is Krka, with 5; Bayer has 3.
| Brand | Owner | Owner based in |
|---|---|---|
| Bilobil | Krka | 🇸🇮 Slovenia |
| AXIO | LifeVantage | 🇺🇸 United States |
| Ambrotose | Mannatech | 🇺🇸 United States |
| Abecedin | Birzeit Pharmaceutical | 🇵🇸 Palestine |
| Nature's Sunshine Products | Nature's Sunshine | 🇺🇸 United States |
| Beauty Focus | Nu Skin | 🇺🇸 United States |
| Hiya | USANA | 🇺🇸 United States |
| Maxmedix | Zydus Wellness | 🇮🇳 India |
About the owner: Bayer
Bayer is a publicly listed company headquartered in Leverkusen, Germany, founded in 1863. Brandtree records 9 brands under its control, and it is listed as XETRA: BAYN.
Bayer was founded in Germany in 1863 as a dye maker and synthesised aspirin in 1897. It spans pharmaceuticals, crop science and consumer health, and its 2018 acquisition of Monsanto brought both the Roundup weedkiller and tens of thousands of lawsuits alleging that glyphosate causes cancer.
🇺🇸 One A Day and other American brands
Brandtree records a controlling owner for 2,549 brands that began in the United States. 478 of them (19%) are now controlled by a company headquartered in another country, One A Day among them.
Frequently asked questions
Who is the parent company of One A Day?
The parent company of One A Day is Bayer, a publicly listed company headquartered in Germany.
Is One A Day American or German?
One A Day originated in the United States in 1940, but it is owned today by Bayer, which is headquartered in Germany. So One A Day is an American-origin brand under German ownership.
Is One A Day still owned by Bayer?
Yes. As of 16 September 2026, One A Day is still owned by Bayer. The ownership record was last checked against primary sources on that date.
Sources (1) & corrections
Last verified . Every ownership fact above is backed by one of these primary documents. Numbers in brackets in the text refer to this list.
- [1] Bayer AG Annual Report 2025 — Bayer AG, Annual report, published 10 March 2026; retrieved 16 September 2026.
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