Medically reviewed by Erika Prouty, PharmD Key Takeaways L-theanine is an amino acid that may improve attention and focus by ...

Green tea carries the same potential downsides as black tea as far as the presence of caffeine and the ability to interfere ...

When it comes to our morning or evening cup of tea, we all have our personal favorites. English Breakfast, anyone? With so many different flavors and brewing techniques, there's something for everyone ...

L-theanine supplements are touted for stress relief, focus and better sleep. Although the evidence so far is preliminary, ...

Green tea and black tea, both from Camellia sinensis, offer distinct health advantages. Green tea, minimally processed, boasts catechins for metabolism and blood sugar control. Black tea, fully ...