Theobromine is a natural compound found primarily in cocoa and chocolate. It belongs to a class of chemicals called methylxanthines, which also includes caffeine and theophylline. Theobromine has a mild stimulant effect and can promote relaxation and alertness. In addition to its stimulating properties, theobromine has been studied for its potential health benefits, such as improving heart health and reducing inflammation. However, it can be toxic to certain animals, particularly dogs and cats, as they metabolize it much more slowly than humans.