improve sleep quality; contains flavones,xi an ess ential for human body;tannic acid free that not ... and contents over 35% Tengcha flavones cinsisting of Myticennntin, Dihydromyricetin, Xi,Fe,K, Zn,Ca,Cu,Mg AND other teace elemen ... Contain the ophylline or caffernethat lead to insomnia Contains flavines, Xi and ess ential trace elements forhiman body Mainly cintain theophylline ...