Why don't coffees have to label the caffeine content? What does "a standard cup of coffee" mean? And how do different coffee and wannabe-coffee energy drinks compare? Caffeine Scientist GreenEyedGuide gives you these answers plus other helpful Caffeine Science tips. Watch the YouTube version at https://YouTube.com/c/GreenEyedGuide and get your copy of the Energy Drink Report Card at https://GreenEyedGuide.com/freebies