One A Day (sometimes referred to as One-A-Day) is a product family of multivitamins produced by the Bayer corporation. One A Day was introduced in 1940 by Miles Laboratories.[1][2]
Bayer markets fifteen products in the One A Day line:
Bayer had heavily[3] marketed a "WeightSmart" brand, but it was discontinued after the United States Federal Trade Commission recovered $3.2 million[4] as part of $25 million settlement from Bayer, alleging that Bayer had falsely claimed that the product led to weight loss.
One-A-Day Women's multivitamin was tested by ConsumerLab.com in their Multivitamin and Multimineral Supplements Review of 38 of the leading multivitamin/multimineral products sold in the U.S. and Canada.