L-teanina

L-theanine is a compound that occurs naturally in green tea and black tea, and it is also available in supplement form.

Research suggests that L-theanine might provide a range of health benefits, which may include improved mental focus and better sleep quality.

L-theanine is an amino acid. The human body does not produce this compound, and it is not essential for humans. Green tea, black tea, and certain types of mushroom naturally contain L-theanine.

L-theanine may affect the levels of certain chemicals in the brain. These include serotonin and dopamine, which influence mood, sleep, and emotion, and cortisol, which helps the body deal with stress.

A change in the balance of these chemicals can change a person’s mood or stress levels.