Green Tea Extract / EGCG
Polyphenol-rich antioxidant for metabolic and cardiovascular health
What It Is
Green tea catechins — particularly EGCG (epigallocatechin gallate) — are among the most studied plant compounds for health and longevity. Populations with high green tea consumption consistently show lower rates of cardiovascular disease and certain cancers.
How It Works
EGCG activates AMPK (cellular energy sensor), inhibits mTOR (promoting autophagy), and has potent antioxidant activity. It also modulates inflammatory pathways (NF-kB), supports fat oxidation, and may enhance mitochondrial function through PGC-1alpha activation.
The Science
Green tea consumption and mortality due to cardiovascular disease, cancer, and all causes in Japan
JAMA (2006) · PubMed
Large prospective study (40,530 adults) showing green tea consumption associated with reduced cardiovascular and all-cause mortality.
Effects of green tea catechins on body weight, body composition, and inflammation in overweight adults
Journal of the American College of Nutrition (2010) · PubMed
RCT showing green tea catechin supplementation modestly reduced body weight and improved metabolic markers.
Dosage
Green tea: 3–5 cups/day (the amount in most observational studies). EGCG supplements: 200–500mg/day. Take with food to reduce potential liver stress from concentrated extracts.
Safety
Green tea beverage is very safe. Concentrated EGCG supplements have rare but documented cases of liver toxicity at high doses (>800mg/day). Take with food, avoid on empty stomach. Caffeine content varies.
Skeptic's Corner
Most of the impressive longevity data comes from observational studies in East Asian populations — confounded by overall diet, lifestyle, and genetics. RCTs of green tea extract show modest metabolic benefits but haven't demonstrated lifespan extension. The liver toxicity risk with high-dose supplements is real and underappreciated. Drinking actual green tea may be safer and comparably effective to supplements.
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