Ten years ago exercise scientists began to investigate the potential endurance-enhancing properties of ciwujia the active ingredient in Endurox Excel. Ciwujia has been used in traditional Chinese medicine for over 1700 years. What intrigued researchers were anecdotal reports of ciwujias use by Tibetan mountain climbers to improve work performance at high altitudes. They postulated that ciwujia &40;also called Eleutherococcus senticosus&41; could improve exercise endurance. Peer-reviewed studies conducted both in the U. S. & China have shown ciwujia extends endurance & increases the metabolism of fat for energy during high intensity exercise. No other herbal product has been as extensively studied & proven to enhance endurance parameters as ciwujia.. Recently researchers published a major new study evaluating the effect of ciwujia in cyclists. The investigator used a double-blind placebo-controlled crossover protocol which is the gold standard for research. They found that after eight weeks Endurox Excel supplementation: Increased endurance by 23% Increased peak VO2 by 12% Increased fat metabolism by 20% Increased heart rate by 4% with no increase in fatigue levels The investigators concluded Endurox Excel &8220;is an effective nutritional ergogenic aid for people who perform endurance exercise”.60 caplets