A caffeine comparison needs a defined serving. A small espresso and a large brewed coffee can differ in concentration and total quantity, so comparing only their names is not enough. The source's FAQ also questions whether bitterness can reveal caffeine content; added flavors and the rest of the drink make that an especially poor measuring tool.
Use current information for the actual product when available. Count the full serving and any other caffeine-containing components rather than assuming that every cup contains a standard number of milligrams. Decaffeinated coffee can still contain some caffeine, and a dark roast label is not a complete caffeine declaration.
Personal sensitivity and circumstances differ. The FDA's caffeine overview emphasizes that medications and individual conditions can matter, so a general coffee article cannot supply a personalized limit. If that question affects your health or medicines, discuss it with a qualified professional. Clear labels and careful units are useful information; a flavor impression or an old FAQ's broad figure is not a substitute.
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A good question can make a better brew.