ca n't afford a letdown . '' Each 2-ounce bottle contains zero grams of sugar , 4 calories and about the same amount of caffeine as a small coffee . It also contains about a dozen ingredients that are broken down into B vitamins -LRB- B3 , B6 , B9 , B12 -RRB- and what the manufacturer lists as an `` energy blend . '' But do n't expect superhuman results , one expert said . `` The B vitamins are given at extraordinarily high levels , and people need to know they are not some magic potion that 's going to immediately raise your energy level , '' said Dr. Brent Bauer , Mayo Clinic director of complementary and integrative medicine . `` There is no data that show that . '' The overall health impact of the shots ' energy blend is a little fuzzy , according to some experts , because little data has been collected about the effectiveness or safety of the natural compounds . The blend contains : citicoline , tyrosine , phenylalanine , taurine , malic acid , glucuronolactone and caffeine . Phenylalanine , taurine , tyrosine are all amino acids our bodies naturally
-LRB- CNN -RRB- -- From supermarkets to the office supply store , it 's hard to miss those tiny bottles of 5-hour Energy . The makers of 5-Hour Energy call it a `` no-nonsense drink . '' `` It would be easier for me to tell you where we did n't sell them in the U.S. than list all the places we do , '' said Carl Sperber , spokesman for Living Essentials , the Detroit , Michigan-based manufacturer of 5-hour Energy shot . The small , shot-glass size bottles promise to provide energy and alertness without jitters to fatigued Americans . Unlike other popular energy drinks that market to college students , 5-Hour Energy 's audience is multitasking , working professionals . The market demand has skyrocketed since the product hit store shelves in 2004 . The company expects to move more than 350 million shots this year , Sperber said , up from 174 million in 2008 . `` This is a no-nonsense drink , '' Sperber said . `` It is not a fashion statement . It does n't have a cool name ; it is just a simple grab-and-go product to help busy adults when they