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Cocoa beans contain caffeine, so the higher the percentage of cocoa in a chocolate bar, the higher its caffeine content. Likewise for coffee: Ounce for ounce, the more diluted the coffee drink, the less caffeine.
The fact that the current study used unadulterated chocolate, made of 100% cocoa, is a major advantage, she says. Some of the ingredients in pure chocolate that might exacerbate acne are caffeine and its cousin theobromine, which is known to have pore-clogging properties, Caperton tells WebMD.