Xendurance is a sports nutrition company that was started in the USA in 2006 when the formula, Xendurance (Extreme Endurance in the USA) was under development. What distinguishes Xendurance from other sports nutrition companies is that the we showcase product, Xendurance, has a published, Gold-Standard, third party, double-blind, placebo-controlled, crossover study backing up claims of 15% reduction in lactic acid and a double digit increase in aerobic threshold.