Postum is a caffeine-free beverage made from roasted grains, primarily wheat and barley, along with some other ingredients. It was first introduced in the early 20th century as a coffee substitute for those looking to avoid caffeine. The drink is brewed similarly to coffee and has a rich, nutty flavor. Originally marketed as a healthful alternative, Postum gained popularity among those who wanted to reduce their caffeine intake. It is often enjoyed hot, but can also be served cold. The product has seen various formulations over the years, but its core appeal remains as a comforting, caffeine-free drink.