L-Theanine is an amino acid that occurs naturally in green tea, as well as in other sources such as mushrooms. It is a popular ingredient in dietary supplements, which is often used for its calming and mood-improving properties. In the context of athletes, theanine can help reduce stress and improve focus. It can be especially important during training and competition. Studies have found that l-theanine can help improve the ability to focus and reduce stress in athletes, which can affect their performance. The amino acid is often found in nootropic boosters and dietary supplements for memory. Theanine is often combined with caffeine because caffeine can help improve energy and endurance. L-theanine may help reduce caffeine side effects such as overstimulation and hand shaking.

Dosage: 100 to 200 mg per day.