Green Tea Extract Halted PIN Progression to Prostate Cancer
A study found extracts of catechins found in green tea to be effective in preventing high-grade prostatic intraepithelial neoplasia from progressing into invasive prostate cancer.

The study used 200 mg of green tea catechins (GTCs) three times daily for 6 months. The study utilized lab extracted catechins.

Catechins are antioxidants, and they belong to the class of polyphenols called flavanols. Epigallocatechin-3-gallate (EGCG) is the major catechin in green tea.

General Info
Green tea's scientific names are: Camella sinensis, Camellia thea, Camellia theifera, Thea sinensis, Thea viridis. It s alternative use is varied: fstomach disorders, headaches, vomiting, diarrhea; topically, as a sunburn wash; as poultice to baggy eyes. Traditionally, it is believed to prevent cancer.

Parts used
Leaf bud, leaf, stems.

Mechanism of action
The active constituent is epigallocatechin, an antioxidant. The catechin components are associated with a reduced risk of small intestinal carcinoma in mice. In humans, green tea use is associated with a decreased risk of adenomatous polyps of the sigmoid colon, esophageal cancer in women, stroke, and cerebral hemorrhage.

Nine cups a day is associated with a decrease in total cholesterol, but with no effect on triglyceride and HDL levels.

Adverse effects
Gastric effects, hyperacidity, constipation, diarrhea, insomina, irritability, palpitations, vertigo, restlessness. A lot of the side effects may be attributable to caffeine content (60-70 mg per 6 oz of tea).

Interactions
May potentiate the stimulant effects of other supplements.
Many possible interactions with other drugs and conditions.