What is a Fat Burner?

Fat Burners are simply classified as any form of nutritional supplements that claim to:

In many cases, these supplements contain ingredients, which each have their own mechanism of action. Often it's claimed the combination of these constituent chemicals can have have accumulative effects.

The full list of supplements claiming to improve fat metabolism is lengthy to say the least. Popular supplements include: caffeine, green tea, conjugated linoleic acid (CLA), L-carnitine, forskolin, chromium, Yohimbe, and Raspberry Ketones. But there are many, many more.