Caffeinex.

API Caffeinex is an energy and metabolism boosting supplement that claims to give you all the energy you need to keep going all day. We expected there to be more than one ingredient in the formula because of the unique name, but all we found was good old caffeine. Well, it increases your heart rate directly, which causes you to burn more calories. There are also some central nervous system changes that take place that may impact metabolism. There are some claims that caffeine, like the 100 mg in API Caffeinex, suppresses appetite and those claims are both right and wrong. At first, when the caffeine boost is the strongest, you may feel a little nauseous and who wants to eat with an upset stomach? After that immediately boost wears off and your energy evens out - you are left with increased metabolism and increased hunger. That is where the other ingredients commonly found in weight loss supplements come into play.