The effects and functions of green tea are clearing the head and eyes, eliminating thirst, resolving phlegm and eliminating food. Green tea is bitter, sweet and cold in nature, and goes to the heart, lung and stomach meridians. It has the effects of clearing the head and eyes, removing thirst, resolving phlegm, eliminating food, diuretic and detoxification. It is usually used clinically to treat headache, dizziness, heartburn, food stagnation (food that is indigested and stagnates in the stomach), phlegm stagnation, dysentery, malaria, and sleepiness. For people with insomnia, the use of green tea is prohibited. Adverse effects of green tea is not known, if used with other drugs may occur drug interactions, please consult your physician or pharmacist for details. If you need to use Green Tea, it must be used under the supervision of a medical professional.