There's not a hard and fast answer to this question, as it really depends on your own individual caffeine tolerance. But we would recommend starting small and working your way up if you're looking to include espresso beans in your diet. Generally speaking, most people can handle around 95mg of caffeine without any problems. So if you stick with our estimate of 10-20 chocolate-covered espresso beans per cup of coffee, you should be good. If this feels a little high, go with half that amount to start and see how it goes from there!