Metabolic Burn Tropin-EF is a fat burner and weight loss product that will increase metabolism with natural L-Tyrosine that will aid in the release of stored body fat, control appetite, and provide a stimulant free energy booster and natural fat burner. It's time to increase metabolism without Ephedra. The higher a person's Metabolic Rate, the more calories that will be burned along with greater fat loss. more information