19 Apr 2018 --- When taken as food supplements, green tea catechin doses at or above 800mg/day may pose health concerns, according to the European Food Safety Authority (EFSA), which assessed the safety of green tea catechins from dietary sources, following concerns regarding their possible harmful effects on the liver. Catechins from green tea infusions and similar drinks are generally safe, the authority found, but certain supplements may be best avoided.
