Theanine and Caffeine

Beside contain of caffeine, tea contain of theanine and contain of small theobromine and theophylline. Flouride and aluminum also found in tea, with certain type of brick tea made from old leaves and stems having the highest levels. Tea plant have high sensitivity to and absorb of environmental pollutants. Dry tea contain more caffeine by weight than coffee, nevertheless, more dried coffee is used than dry tea in preparing the beverage, which means that a cup of brewed tea contains significantly less caffeine that a cup of coffee.

Antibiotic and Benefit effects:
The benefit of green tea cathechins shown to possess of antibiotic properties due to the role in disrupting a specific stage of bacterial DNA replication process.

From many article also mention that green tea protects against a range of cancers, including lung, prostate and breast cancer. Tea contain of antioxidant epigallocatechin gallate (EGCCG) that this substance can function against cancer. For this purpose white tea has been claimed to be more effective. Green tea in combination with tamoxifen is effective in suppressing breast cancer growth.

In July 2005 review of claims made about health benefit of green tea, that conclude it was highly unlikely that green tea reduces the risk of breast and prostate cancer. So if we consume regularly of green tea this can make reduce the risk of having cancer.