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Is an amino-acid found mainly in tea. It is known to easily cross the blood-brain barrier. Once there it influences several neurotransmitters, stimulating learning capacity and memory. L-Theanine seems to have the strongest effect on the GABA-system. The GABA-system is an inhibitory system in the central nervous system involved in inhibition and relaxation. 
By adding theanine to our formula NZT.1 we counterbalance possible effects of a formula with only stimulating effects, like overfocus. NZT.1 gives a broad, calm and relaxed focus. We are excited about L-Theanine. We limited the dosage of L-Theanine due to it's strong effect. Too high a dosage can cause tiredness. More information on L-Theanine.