Results from 15 studies that examined green tea catechins and its naturally occurring caffeine content were included, which represented 1,243 people studied from 8 to 24 weeks. Collectively, the group taking green tea catechins plus caffeine was associated with a significantly greater weight loss when compared to a control group taking caffeine alone. The average difference in weight loss was about three pounds over approximately 12 weeks. The amount of total catechins taken ranged between 576-714 mg per day consisting of primarily EGCG and other minor ones.
These findings provide convincing evidence that green tea catechins can assist people with achieving greater weight loss.