Green tea extract is a herbal derivative from green tea leaves. Green tea is one of the most powerful and potent sources of antioxidants on the planet. This is due to the EGCG (epigallocatechin gallate) found in green tea leaves. EGCG is an antioxidant that has the ability to inhibit the growth of cancer cells without harming healthy tissues. It also may be useful in lowering LDL cholesterol levels. Green tea also positively boosts energy levels and supports the endocrine and nervous system.