• Cause of a crash, perhaps
• Chocolate ingredient
• Coffee's kick
• Cola ingredient
• Common alkaloid
• Eye-opener, literally
• It can keep you up
• Joe's stimulant
• Jolt in Jolt
• Mild stimulant
• Red Bull ingredient
• Stuff that people may get jittery with... or without
• Upper that's legal to down
• A bitter alkaloid found in coffee and tea that is responsible for their stimulating effects
кофеин