L-Theanine supports calming and relaxation, reduces irritability and low mood states. L-Theanine has been extensively researched for its ability to reduce stress, anxiety and unwanted behavior. L-Theanine is a naturally-occurring amino acid found in green tea that is a derivative of glutamic acid; a neurotransmitter in the brain. It helps the body to produce other calming amino acids such as Dopamine, GABA and Tryptophan and helps bring certain neurotransmitters into better balance. Studies done on L-Theanine showed that dogs reduced anxiety-related behavior without adverse effect or drowsiness; dogs were alert, playful and calmer than expected given their situations.