Research shows that instant coffee usually contains less caffeine than regular coffee. One 6 oz cup contains roughly 45 mg or an average of about 57.1 mg. Although the name may be deceiving ...
Starbucks serves 75 milligrams of caffeine in each of its .75-ounce espresso shots. Dunkin Donuts claims a hefty 118 milligrams per shot. In comparison, drip coffee ranges from around 12 to 16 ...