Another study examined the interaction between L-theanine and caffeine, particularly in the context of sleep quality. The findings suggested that L-theanine can counteract the negative effects of ...

Discover how caffeine and L-theanine significantly improved focus and executive dysfunction in a 35-year-old male with ADHD. Learn about this integrative approach to managing ADHD symptoms through ...

Drinking more than 400 milligrams of caffeine per day may cause side effects if you are drinking teas that contain L-theanine. One 8-ounce cup of tea may contain 14-60 milligrams of caffeine.

There’s evidence the effects of caffeine in a cup of tea are enhanced by an amino acid it contains, called L-theanine ... and if you’re impacted by any side-effects such as digestive issues ...