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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.<br>

See also : [[Chocolate]]