Theanine

Theanine is an amino acid found almost exclusively in tea which has historically been used as a relaxing agent. Research conducted by Oxford University suggests that L-theanine is responsible for promoting a feeling of relaxation, yet maintaining an alert mind. Research conducted at 50mg of L-theanine - the amount found in two to three cups of tea -naturally stimulates specific brain activity, known as alpha waves. Alpha brain waves are associated with a feeling of a relaxed, yet alert mental state.