Theobromine is a bitter alkaloid of the cacao plant, with the chemical formula C7H8N4O2. It is found in chocolate, as well as in a number of other foods, including the leaves of the tea plant, and the kola (or cola) nut. It is classified as a xanthine alkaloid, which also includes the similar compounds theophylline and caffeine. The compounds differ in their degree of methylation. Theobromine is the primary alkaloid found in cocoa and chocolate. Cocoa powder can vary in the amount of theobromine, from 2% theobromine to at least 10%. There are usually higher concentrations in dark than in milk chocolate. Theobromine can also be found in small amounts in the kola nut (1.0–2.5%), the guarana berry, Ilex paraguariensis (yerba mate), and the tea plant. 1 oz of milk chocolate contains approximately 60 mg of theobromine but 1 oz of dark chocolate contains about 200 mg. Cocoa beans naturally contain approximately 1–4% theobromine.
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