Bayer One A Day Women's Multivitamin is American, because this product is produced by the American company Bayer. Bayer, headquartered in Pittsburgh, USA, is a world-renowned pharmaceutical and chemical company. The various health care products and drugs it produces are well-known around the world. During the production process, Bayer will conduct strict quality control on its products to ensure their safety and effectiveness. In addition, the demand for health care products in the U.S. market is also large, so Bayer positioned this product for sale in the U.S. market.