There's also recently been some study into EGCG and HIV, probably the most infamous of auto-immune diseases. Researchers have found that the EGCG in green tea may be able to be used as a vaginal cream to prevent transmission of HIV. It also may be able to be used to treat people who already have HIV. The Chinese have used green tea for 2-3,000 years for medicinal purposes. It's about time our modern science catches up.