W.K. Buckley Limited is a Canadian corporation founded in 1919, by William Knapp Buckley, that manufactures medicines for health problems such as the common cold. They also have children's medicine which are sold under the brand Jack & Jill. The company is located in Mississauga, Ontario. In 1978, after W.K. Buckley's death, his adopted son Frank Buckley became the president of the company. In the mid-1980s, Frank became spokesperson promoting the "It Tastes Awful. And It Works." slogan, which became very successful.