L-Theanine is an amino acid found in tea. It has calming effect, induces relaxation, prevents depression, and improves the mood. It helps in maintaining the ideal blood pressure and reduces the risk of heart attack. It is beneficial in maintaining the brain functions and improves focus, alertness, and concentration. It increases the production of dopamine that helps in curbing the appetite and cravings. L-Theanine also improves the metabolism that aids in the burning of fat. L-Theanine also improves the immune function that protects the body against bacterial and viral infections. It also aids in regulating the blood sugar and blood cholesterol levels.