Four Loko is a flavored alcoholic beverage that combines malt liquor with caffeine, taurine, and guarana. Originally introduced in 2005, it gained popularity for its high alcohol content and vibrant flavors, appealing to younger consumers. In 2010, Four Loko faced scrutiny and regulatory challenges due to health concerns related to its caffeine content. As a result, the company reformulated the drink to remove caffeine, leading to a more traditional alcoholic beverage. Today, Four Loko is available in various flavors and is often consumed at parties and social gatherings.