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 ...

We all have our favorite caffeine vehicles—yours might be a thick, foamy espresso or a strong cup of Earl Gray tea, or chocolate. I like a good cup of black coffee made with a French press! One way or ...

Three years ago, Justin Zheng, an entrepreneur in San Francisco, lay groggy in bed while a group of venture capitalists twiddled their thumbs waiting for him. “I completely forgot this meeting was ...