<s>[INST] what chemicals does l-theanine affect [/INST] Theanine is an amino acid found in tea and some mushrooms. It comes in two forms: L-theanine and D-theanine. L-theanine is the most common form. 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.</s>\ <s>[INST] so what exactly does it do in laymans terms? [/INST] In simple terms, L-theanine is an amino acid that can affect your brain and how you feel. It can increase feelings of relaxation and reduce stress and anxiety by influencing the levels of certain chemicals in the brain. For example, it may boost levels of serotonin, which can improve mood, and lower levels of cortisol, the stress hormone. This can help you feel more relaxed and calm.</s>