Taking more than 800mg of green tea supplements each day may pose health concerns, according to the EU. Officials were unable to confirm a safe dose. They have called for further scientific trials into the effect of green tea supplements and for labels to announce the risks.
It comes after Canadian health officials demanded more explicit warnings on green tea extracts about their links to liver damage.
Many adverse effects have been reported in medical journals in recent years, including a man in Australia who required a liver transplant. In England, a 16-year-old girl was rushed to hospital with a form of hepatitis after taking green tea slimming pills. EFSA conducted the research amid fears of supplements having harmful effects on the liver, prompted by multiple cases in Norway. Norway even issued a warning two years ago about the products – despite their purported health benefits. EFSA's review, published today on its website, confirmed the link between green tea supplements and liver damage.
However, it accepted there was no risks of liver damage for consuming infusions – even after high consumption.