Tea-X is a powerful, standardized green tea extract with 50% epigallocatechin gallate (EGCG) content, which is one of the most important polyphenols in tea. Tea-X increases energy expenditure (thermogenesis), burning preferentially fat. Green tea has not been associated with negative effects on the cardiovascular system (such as increased heart rate and blood pressure), or CNS side effects (such as overstimulation and irritability).