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Our Company



Xendurance is a sports nutrition company that was started in the US in 2006 when the formula, Extreme Endurance was under development. The parent company, Lifespan International US., is located in Carefree, Arizona. Lifespan's goal was to develop an all-natural, drug-free product, which would improve an athlete's performance by improving both aerobic and lactate acid threshold. Xendurance also wanted to develop a formula that would safely reduce the “culprit" known as lactic acid.
Lifespan International recognized that athletes not only benefit from performance products but they also need to protect their health and immune systems from the trauma of rigorous training schedules. With that in mind, Lifespan continuously expands the Xendurance product line of power-packed multi-vitamins, omega and joint formulas, protein and electrolyte drinks, with unique formulas backed by science.

What distinguishes Xendurance from other sports nutrition companies is that the showcase product, Extreme Endurance, 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. Many companies make substantial claims on individual ingredients, but Extreme Endurance has a published study on the complete formula, not just the ingredients. “Third party" testing is also important because it means that Lifespan International did not know or hire the actual facility that did the testing therefore no bias was influencing the outcome of the study.

Extreme Endurance was the first sports nutrition product made in the US to be certified drug-free by LGC; INFORMED CHOICE & INFORMED SPORT, the world renown, sports doping laboratory.

Xendurance continues to provide research and studies that prove their products.

An open label study on 11 cross-functional athletes was conducted using Extreme Endurance with results showing an average 6.2% or a 22-second improvement in the workout “Fran". Blood tests also showed reduced lactate levels by 8.9% immediately post workout and a 7.1%, 10 minute post workout when compared to blood samples taken at baseline.

Another open label study on CK levels, completed in the beginning of 2014, showed an improvement of 63.55%. Results of all Xendurance studies are found on this website.

Since 1998, many of the Xendurance formulas have had numerous newspaper, magazine articles and 6 best-selling books written by leading experts and PhD's about the high quality science and ingredients that distinguish these products.

Xendurance continues to be on the forefront of using this science and success in providing sports nutrition to athletes in every sport, no matter the level of participation or performance.