Green tea extract and caffeine are often combined in supplements to enhance energy, focus, and fat metabolism. When taken together, they may offer synergistic benefits but raise the risk of side ...

In this method, caffeine is extracted from tea. The type of tea that is used isn't very important (as long as it is ...

Both coffee and green tea can boost energy and support your heart. Experts say the best one for you depends on your health ...

Green tea contains caffeine and tannins, an antioxidant that can mess with iron absorption. So drinking it at certain times ...

Drinking green tea with L-theanine can cause calm alertness because the caffeine in the tea wakes you up, while L-theanine promotes relaxation.

Share on Pinterest Caffeine in coffee and tea may help reduce body fat and decrease the risk of developing type 2 diabetes. Westend61/Getty Images New research suggests coffee and green and black tea ...