Green Tea Extract
Green Tea Extract
Snapshot
Green tea extract is concentrated from the leaves of Camellia sinensis, rich in catechins—particularly epigallocatechin gallate (EGCG)—and provides antioxidant, metabolic, and cellular support.
What is Green Tea Extract?
Green tea extract is obtained by steeping or solvent‑extracting unoxidized tea leaves, then concentrating the polyphenolic fraction to yield high levels of green tea catechins, especially EGCG.
Where It Comes From
High‑quality green tea leaves (often from Japanese sencha or Chinese green teas) are harvested, steamed or pan‑fired to prevent oxidation, and then extracted with water or ethanol to produce standardized extracts.
Key Nutrients & Compounds
The extract’s primary actives are catechins (EGCG, EGC, ECG, EC) alongside a small amount of caffeine and L‑theanine. These compounds work synergistically to support antioxidant defenses, metabolism, and neuroprotection.
Health Benefits
Green tea catechins protect cells from oxidative stress, support healthy weight management by enhancing fat oxidation, promote cardiovascular health by improving endothelial function, and may support cognitive function and metabolic balance.
Recommended Dosage
Typical dosages range from 300–500 mg of extract standardized to 50–75% EGCG per day (equivalent to 3–5 cups of brewed green tea). Higher clinical doses (up to 800 mg EGCG) are used under supervision.
How to Use It
Take capsules or powders with water, ideally between meals. Consuming with food can reduce potential gastric upset. Combining with a small amount of protein or vitamin C may enhance catechin absorption.
Who Should Use It?
Ideal for individuals seeking antioxidant protection, metabolic support, or neurocognitive benefits. Suitable for those aiming to improve weight management, heart health, or brain function.
Possible Interactions or Cautions
High doses may cause mild gastrointestinal discomfort or liver enzyme elevations in sensitive individuals. Green tea extract can interact with stimulant medications and may inhibit iron absorption; take away from iron‑rich meals.
Final Thoughts
Green tea extract delivers a potent, research‑backed polyphenol profile that supports broad health outcomes, from antioxidant defense and metabolic enhancement to cognitive and cardiovascular wellness. When used responsibly, it is a versatile and effective supplement.
Scientific Studies
Hursel, R., & Westerterp‑Plantenga, M. S. (2010). Catechin‑ and caffeine‑rich teas for control of body weight in humans. American Journal of Clinical Nutrition, 91(1), 3–13.
https://doi.org/10.3945/ajcn.2009.28095
Mandel, S. A., & Youdim, M. B. (2004). Catechin polyphenols: neurodegeneration and neuroprotection in neurodegenerative diseases. Free Radical Biology and Medicine, 37(6), 304–317.
https://doi.org/10.1016/j.freeradbiomed.2004.05.034
Suzuki, A., et al. (2012). Green tea extract improves forehead skin microcirculation and elasticity in healthy human. Journal of Nutritional Science and Vitaminology, 58(5), 375–382.
https://doi.org/10.3177/jnsv.58.375