Tea has been one of the beverages consumed for many years. The earliest information on tea comes from China and India. The tradition of consuming green tea thus dates back more than 4,000 years. Originally, tea was used for medicinal purposes. Green tea is extracted from the leaves of the evergreen shrub Camellia sinensis.

Green tea contains a multitude of bioactive compounds, the most important of which are polyphenols, amino acids (theanine), flavonoids, tannins and purine alkaloids. These compounds are contained in the dietary supplement Zein Pharma - L-Theanine. The supplement contains green tea leaf extract, and includes l-theanine and polyphenols. Take 1 unbitten capsule per day with still water, preferably before main meals.