Green tea extract is a common ingredient in many weight loss supplements for its "fat burning" properties. It comes from the leaves of camellia sinensis, the same plant from which black, green and oolong teas are made. Green tea extract has long been associated with health benefits such as treating headaches, lowering cancer rates, and improving overall health. Some of these claims are supported by clinical research, but many argue that larger and more controlled studies are needed.

How It Works & Clinical Evidence

Green tea extract contains high levels of Epigallocatechin Gallate, usually abbreviated as EGCG. It is a type of antioxidant called a catechin. One study published in the American Journal of Clinical Nutrition indicates that EGCG may increase metabolic rate, meaning it helps you burn more calories.

There is always some caffeine in GTE. Caffeine is appetite suppressant However, the levels seem to vary widely by manufacturer. Many supplements contain multiple sources of caffeine (guarana, green tea, so it helps to choose one that lists total caffeine per pill.

Proponents claim it has many other health benefits, and there is some evidence to support this. Because of its unique antioxidant properties, the extract may assist in protecting cellular membranes against the damaging effects of too many free radicals, and thereby warding off certain types of cancers. Some claim it is 100 times stronger than that of vitamins C or E. When taken as a dietary supplement, the recommended dose is usually 1-2 capsule/day at meals, but it may vary by brand.

Sources & Additional Information:

EGCG diet study details - from the American Journal of Clinical Nutrition
Green tea health benefits - from the University of Maryland Medical Center