In the small number of controlled studies done on these products, the slight increase in metabolic rate was insignificant to weight loss. According to The Center for Science in the Public Interest, many of these drinks are ineffective and their advertising claims false.
A better choice would be to simply replace caloric beverages with no-calorie drinks like water. Or for a "calorie burning" drink, try ice water! Your body will burn calories as it warms the water to your body temperature.
It takes one Calorie to raise the temperature of one kilogram of water one degree Celsius, and you will burn just under nine Calories warming up an 8-ounce glass of ice water. That's not much, but if you drink eight 8-ounce glasses of ice water a day that would be about 500 Calories a week. But remember, water has no calories to begin with -- this won't work with ice cream!
Of course I recommend sound nutrition and exercise as the solution to maintaining a slim and healthy body. But if you want a gimmick to burn a few extra calories, you might do as well drinking cold water as spending your money on dubious calorie burning drinks.
Megan Porter, RD