Green tea extract, a great anti oxidizing supplement, is an ancient supplement that works. One of the benefits of green tea extract is in the area of heart disease prevention. Green tea extract is also a common ingredient found in a lot of fat burners. It helps speed up metabolism and those with heart conditions may find it beneficial as it has the ability to speed up metabolism without speeding up heart rate.
It seems that green tea possesses a good many powerful antioxidants which help our own metabolic rate increase by a certain percentage above what our normal rate would be had we not drank the tea.