**6. Conclusion**

Tea contains polyphenols that may provide an important source of dietary antioxidants in humans. Moderate consumption of tea seems to reduce the risk of MetS and/or MetS-related diseases. EGCG, the main catechin in tea, presents major health benefits. Green tea seems to have the best potential antioxidant effects when compared to other teas. It is worth mentioning that most of the studies have not demonstrated toxicity due to tea consumption or supplementation; however, further research, especially in humans, should be conducted to confirm this property and evaluate the underlying mechanisms of action.
