Cellular Protection Powerful Free Radical Scavenger GMP Quality Assured A Dietary Supplement NOW Green Tea Extract offers a convenient way to obtain the active constituents of Green Tea in a concentrated form. Green Tea Extract (GTE) supplies numerous bioactive compounds, including Polyphenols and Catechins, that are known for their many health-supporting properties. These compounds have been found to help protect against oxidative stress and may also help to maintain a healthy inflammatory response.