Coffee contains caffeine, which is the most commonly consumed psychoactive substance in the world. Caffeine is also included in most commercial fat-burning supplements today — and for good reason. Moreover, it's one of the few substances known to help mobilize fats from your fat tissues and increase...

Vitamin D is an essential ingredient in our lives. Adequate amounts of vitamin D promote calcium and phosphorus absorption—essential mechanisms for healthy bones and teeth—and is also considered by organizations such as the National Cancer Institute as a nutrient with potential to ward off serious diseases. Unfortunately, like...