Evidence Level
EGCG research is vast with over 7,000 publications. Huang et al. (2019) provided the most comprehensive meta-analysis of metabolic benefits across 41 RCTs. Kuriyama et al. (2006) published the landmark epidemiological study linking green tea consumption to reduced cardiovascular mortality in 40,000+ Japanese adults. Singh et al. (2011) reviewed EGCG's molecular mechanisms across longevity pathways. The hepatotoxicity concern is real — the USP, EFSA, and multiple case reports have documented liver injury with high-dose fasted EGCG supplementation, leading to recommendations to always take with food and stay below 800mg EGCG daily. The EGCG from matcha tea appears safer than concentrated extracts, possibly due to the presence of other protective compounds.