Westend61/Getty Images. The Food and Drug Administration (FDA) maintains that an upper limit of 400 milligrams is the upper daily limit, above which it may cause side effects or health problems That’s based on a 1-ounce serving, as that’s the typical amount of the rich, dark joe used in an espresso-based drink. Regular Coffee: 95 to 200 milligrams of caffeine. Decaffeinated Coffee: 2 to 12 milligrams of caffeine. Espresso: 47 to 75 milligrams of caffeine. Decaffeinated Espresso: 0 to 15 milligrams of caffeine. Most adults can safely consume 400 milligrams of caffeine — or the amount in about four eight-ounce cups of brewed coffee or six espresso shots — per day, according to the Food and Drug Get emergency help immediately if any of the following symptoms of overdose occur while taking caffeine: Symptoms of overdose. Irritability; nervousness; rapid heartbeat; trouble sleeping; Other side effects of Caffeine. Some side effects of caffeine may occur that usually do not need medical attention. These side effects may go away during There are about 23 milligrams of caffeine in a 1-ounce square of unsweetened baking chocolate. A larger bar (3.5 ounces) of very dark chocolate (70-85% cacao) has about 80 milligrams. A 3.5-ounce dark chocolate (50-69% cacao) has about 70 milligrams. And a 3.5-ounce bar of milk chocolate has just 20 milligrams of caffeine. Most Caffeinated Tea Drinks at Starbucks. Chai Latte, Iced Chai Tea Latte. Grande: 95 mg. Matcha Green Tea Latte, Iced Matcha Green Tea Latte, Matcha Lemonade. Grande: 80 mg. Matcha Green Tea Crème Frappuccino. Grande: 70 mg. Since the grande is one of the large sizes that Starbucks offers, this drink will have 3 shots of espresso and 225 mg of caffeine. Caffe Americanos offer a different flavor profile than Starbucks’ brewed coffee as it features espresso. Generally, a Caffe Americano will have a richer flavor and slightly thicker texture than brewed coffee. For example, Costa's medium cappuccino was strongest, with caffeine equivalent to four cups of tea, while Starbucks' contained the least at 66mg - less than a single cup of tea. Caffeine risks 5Jvx4P9.