the best way to lose fat is diet and exercise, not suppleents.
Its the caffeine int he coffee which is a thermogenic agent (helps burn fat), it is also a stimulant, hence the endurance aspect. But I wouldnt even bother with that. WHy take long term drugs when the same can be acheived (maybe slower) naturally.
I never drink coffee anyway.
for those inetrested, there are some other natural thermogenic agents like caffeine that can all combine to produce stronger results when taken together - these include Guarana, Suma and green tea. a herb called Coleus Forskolin is also said to act as a catalyst to these reactions.
combining these seperately will probably be cheaper than buying an off the shelf supp, and have mostly the same effect anyway.