L-theanine

L-theanine is a compound most commonly associated with tea leaves, especially green and black tea. From a chemical point of view, it is classed as a non-protein amino acid, which sets it apart from the classic amino acids that build proteins. Its presence in tea means it has long attracted the attention of people who pay close attention to naturally occurring ingredients in plant-based raw materials. In supplements, it appears as an isolated ingredient provided in a precisely defined amount.