Green Tea Extract
Green tea extract is a concentrated source of polyphenols derived from the leaves of Camellia sinensis, with EGCG (epigallocatechin gallate) being its most pharmacologically active catechin. Used for centuries in East Asian medicine, it has become one of the most extensively researched plant-based supplements, valued for its broad effects on metabolism, cardiovascular function, and cognitive performance.
Expert Evidence
3 references from 2 experts
“I take a couple of green tea capsules in the morning.”
Supplements for Longevity & Their Efficacy | Dr. Peter Attia
2:20:431 reference in 1 episode from 2024
Huberman reports taking a couple of green tea capsules in the morning, indicating regular personal use. No specific dosage, brand, or reasoning for supplementation is provided, and no benefits, cautions, or scientific evidence are discussed.
“Green tea or green tea extract has a similar effect as caffeine but in the 4 to 5% range for about the same length and duration. One thing that has been documented pretty consistently with caffeine, nicotine, and green tea is they all also affect satiety, so they're appetite suppressants.”
Eight Supplements, Foods & Habits to Boost Resting Metabolism | Dr. Andy Galpin
11:112 references in 2 episodes
Galpin describes green tea extract as having a modest metabolic boost (4-5% range), similar in duration to caffeine, and notes it consistently acts as an appetite suppressant by affecting satiety. No evidence of personal use, no specific dosing recommendations, and no cautions discussed.
Side Effects
- Nausea on an empty stomach
- Liver enzyme elevation at very high doses
- Insomnia if taken late due to caffeine content
- Mild digestive discomfort