L-Theanine được sản xuất bằng water extraction of Camellia sinensis leaves or by enzymatic/microbial synthesis.
Quá trình này cho ra a white crystalline powder at ≥98% purity. It is the signature amino acid of green tea responsible for its calming effect without drowsiness, modulating GABA, serotonin, dopamine and increasing alpha brainwaves, được sử dụng rộng rãi trong focus, stress and sleep supplements (often paired with caffeine).