2004/03/14, 03:10 PM
The thermogenic effect of green tea involves two mechanisms: I.) green tea contains a catechin, EGCG, which inhibits catechol O-methyltransferase (COMT), an enzyme that degrades noradrenaline II.) the caffeine in green tea increases intracellular cAMP accumulation by inhibiting the enzyme, phosphodiesterase.
Research suggests that EGCG is the most important catechin for weight loss. Although most products specify the amount of polyphenols, only a few list the EGCG content. For weight loss purposes, the most powerful Green Tea extract is the standardized Green Tea Extract by NSI -- it contains a whopping 220 mg of EGCG per capsule. The second most powerful green tea extract is the Life Extension Super Green Tea Extract, which contains 122 mg of EGCG per capsule.
Apparently, all of these green tea extracts that are standardized to extremely high levels of EGCG contain very little caffeine.
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