FRS® is a full line of products based on clinical science—not marketing hype. (And they taste great, too!) FRS was originally developed by health scientists to provide sustained energy for chemotherapy patients. Today it is used by elite athletes, wellness experts and anyone who wants to lead a healthy, active lifestyle. All FRS products feature quercetin, a powerful all-natural antioxidant found naturally in many fruits and vegetables. It has been shown in multiple clinical trials to provide sustained energy, increased endurance, immune system support along with many other health benefits. FRS products are now championed by some of the world’s most elite athletes such as NFL star Tim Tebow, Captain of the US Women’s National Soccer Team Christie Rampone and over 20 professional sports teams.