The Healthwell L-theanine 200 contains the amino acid theanine in concentrated form. The amino acid is found naturally mainly in the leaves of the tea bush and especially in green tea. In the body, the amino acid helps with the release of serotonin and dopamine from the brain. These neurotransmitters affect our mood and our reward system. Serotonin is what affects our fear and anxiety, but at high levels we become calmer. Dopamine is linked to the brain's reward system, so when these levels are high, we feel happy and calm. That is why it is perhaps not so strange that many people like to have a cup of green tea before going to bed. In L-theanine 200, the amino acid theanine is a concentrated form and you dose easily by taking a capsule before going to bed.