Quercetin is one of the primary sources of healthy energy in the FRS energy products.  Quercetin is a powerful anti-oxident that can be found naturally in the skins of apples, red onions, and blueberries.  It can also be found in cocoa and spinach.  According to the current research, it is believed that Quercetin lives for a long time in the blood stream and provides the sustained energy from the FRS energy products.

Others have been talking about the benefits of Quercetin, also.

http://www.phytochemicals.info/phytochemicals/quercetin.php
http://nutrition.about.com/od/phytochemicals/p/quercetinprofil.htm

When combined with the green tea extract in FRS energy products, the drinks help manage your weight, increase metabolism, strengthen the immune system, and helps the body burn excess fat and carbs.