Xendurance
The Endurance-Boosting Supplement that Every Runner Needs
#1 Improve Workout or Race Time
Clinically proven to reduce lactic acid and improve running performance - Extreme Endurance is a must have for any runner.
Whether you are gearing up for your next marathon or want to set a new 5K PR, this is a must have product to put to the test.
#2 Increase VO2 Max
Increase your pace and be able to hold on. Extreme Endurance makes it feel like you have a third lung while preventing your muscles from tightening up.
#3 Trusted By World Class Runners
Contributing to personal records, American records, and World Records - Extreme Endurance has been used by runners for over a decade to help break barriers.
Donavan Brazier set the American Record in the 800m after being on Extreme Endurance for two months.
#4 Improve Recovery Time / Less Muscle Soreness
Feels like putting on a brand new pair of running shoes every day.
Look forward to putting in more miles when you don't feel yesterdays workout.
By reducing Creatine Kinase (CK) levels by 6x means your muscles recover better during workouts and help speed up recovery.
#5 Clinically Proven + Tested By Informed Sport
Supported by 12 Clinical Studies and certified free of banned substances by Informed Sport. It feels like a performance enhancing drug, but isn't.
GOODBYE SORENESS HELLO PERFORMANCE
26% Reduction of Lactic Acid = Less Muscle Soreness
39% Reduction of Oxidative Stress = Improves Performance
6x Reduction of Creatine Kinase (CK) = Muscle Recovery
Increase in Aerobic Threshold = Better Vo2 Max
Benefits within 72 hours
Certified by Informed-Sport
GOODBYE SORENESS HELLO PERFORMANCE
TRUSTED BY WORLD CLASS ATHLETES
DANIELLE BRANDON
3x CROSSFIT GAMES ATHLETE
MATTHEW CENTROWITZ
OLYMPIC GOLD MEDALIST
JOSH BRIDGES
FORMER NAVY SEAL & CROSSFIT GAMES ATHLETE
CRAIG ENGELS
1500M US TRACK TEAM
DONOVAN BRAZIER
800M WORLD RECORD HOLDER
MATTHEW CENTROWITZ
OLYMPIC GOLD MEDALIST
CRAIG ENGELS
1500M US TRACK TEAM
DONOVAN BRAZIER
800M WORLD RECORD HOLDER
PROVEN IN 12 CLINICAL STUDIES
RECOVERY TIME IMPROVEMENT
After intense workouts our muscles might be sore for days after. Extreme Endurance reduces lactic acid buildup
STAMINA INCREASE
Extreme Endurance helps you push your limits and go the distance, fight fatigue and set PRs
INCREASE POWER
Increase power output by 10-25% with a similar heart rate
DEEPER BREATHS
Proven to increase VO2 Max and Aerobic Threshold
Journal of Athletic Achievement (2016)
ENA Conference, Vienna Austria (2010)
IMPROVE IN 72 HRS
1
Perform a baseline workout
2
Take 3 tablets in the AM & 3 tablets in the PM and train regularly
3
Feel benefits in 72 hours + redo baseline workout
60 Day Supply
$179.85
$115.90
$39 in Savings
$25 Gift Card
FREE Omega+D3
FREE $25 Gift Card
SAME DAY SHIPPING
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JOIN 300,000 CUSTOMERS OVER 10+ YEARS
Customer Reviews
Extremely improved performance really can notice the difference especially on the assault bike. A must for any CrossFit athlete.
This product is amazing! Did my first Ironman with it and I didn’t even feel that very tired afterwards. Recovery was amazingly fast!
Hi Ron,
Thank you for your kind words! We're so glad that this product was able to help you achieve your goals.
Having a Master's degree in exercise science, I'm always skeptical when trying supplements even when I know the research behind them. I am happy to say that I have been very pleased with the results I've gotten from using xendurance. After using xendurance for 3 or 4 days, I noticed that I wasn't as sore after a hard gym session. Additionally, I noticed that my heartrate was five to six beats lower on zone two bike rides despite pushing the same amount of watts or even slightly higher. On a recent bike ride I beat my personal best time up an eight mile climb that averages just under 6 % grade by 9 minutes. Amazing! I am sold on this product and highly recommend it to anyone wishing to increased their performance and recovery.
HI Philip,
Thank you for your review of Extreme Endurance! We are thrilled to hear that you've found the product helpful and that your results have been positive. We recommend that you continue to use Extreme Endurance to reach your fitness goals!
I started taking extreme endurance about six months ago after I started CrossFit. I have made some insane progress in that time and I can absolutely tell a difference while incorporating EE. this was especially evident when I ran out, the week that I didn’t have it I was dogging in my workouts. I won’t run out again!
I’m 41 years old and I’ve been using this product for a while now. I can honestly say you won’t find anything better out there to help you out with lactic acid and soreness. I workout 7 times a week and it’s been in great part thanks to this!
Hi Jose,
Thank you for your review! We're glad to hear that our product has helped you out and that you find it helpful.
I was a little bit skeptical at the beginning about the results you could get from the extreme endurance and Lean + until I found myself running 17 miles 2 weekends in a row!! The most o was able to run before was a half marathon and with huffing and puffing, not I ran 17miles and the next day I was ready for another workout! I’m hooked!!
Hi Christina,
Thank you for your positive feedback! We're so happy to hear that you're enjoying the results of our product. We hope you'll continue to use it to achieve your fitness goals.
RECOVER FASTER
Fights free radical damage & supports crucial cellular functions
Promotes anti-aging by reducing damaging oxidative stress
Increases aerobic threshold and VO2 max for a longer, healthier life
Starts working within 48–72 hours
100% GUARANTEED & BACKED BY THE XENDURANCE PROMISE
Scientific Efficacy: Proven by rigorous scientific research and tested by unbiased 3rd parties.
State-of-the-Art Manufacturing: We only partner with Good Manufacturing Practice (GMP) certified and/or equivalent facilities.
Accessibility for All: We strive to make our product line available to athletes of all abilities!
Certified Drug Free By Informed Sport: 3rd party tested to guarantee free of banned substances
FAQS
How quickly will I see results with Extreme Endurance?
Extreme Endurance will be in your system and working within 48-72 hours. We can confirm this from 12+ years of clinical testing.
Can I take Extreme Endurance with other supplements?
Extreme Endurance can be taken together with almost every other supplement but you do not need to take any product containing Beta Alanine when taking Extreme Endurance.
Please reach out to info@xendurance.com for specific inquiries.
Do I need to take Extreme Endurance with food?
You do not need to take Extreme Endurance with food.
Is Extreme Endurance certified drug free?
Extreme Endurance was the very first US sports nutrition supplement certified drug free by LGC; Informed Sport.
LGC is a world-renowned sports doping control and research laboratory, with over 50 years of expertise in anti-doping in sport. LGC has published over 300 scientific papers on methods for the detection of trace levels of substances that are prohibited in sport and has over 450 man-years of research into doping control.
LGC has been testing supplements and ingredients on behalf of reputable manufacturers and suppliers for over 15 years. It has tested tens of thousands of samples during this time and has also carried out a number of research studies to explore the prevalence of contamination with prohibited substances in products and ingredients.
LGC's research into supplements and contamination also includes several administration studies to investigate the levels of prohibited substances that could cause an athlete to fail a doping test. These have been published in peer-reviewed scientific journals. As a doping control laboratory, LGC works directly with sports authorities, national anti-doping organizations, and national governing bodies worldwide.
Is Extreme Endurance certified drug free by the NCAA?
There are no NCAA approved supplement products. The NCAA does not approve supplements. Since 2007, Xendurance has had thousands of NCAA student-athletes take Xendurance products and rely on the Informed-Sport certification which is a global testing method for banned substances. To learn more please find the Informed-Sport link.
Can Extreme Endurance be taken with caffeine?
Over the years we have found that some people have a very acidic diet and their diet may interfere with the dissolution of the product in the small intestine. On the other hand, one of our athletes drinks 12 cups of coffee per day and lives on Extreme Endurance with great results! Everyone is different but the few that have had issues cleared up the dissolution problem by limiting acidic drinks, red meat, and coffee when taking Extreme Endurance.
We now encourage people to take their caffeine within an hour prior to or after taking their tablets just as a precaution.
Do I need to cycle off Extreme Endurance?
You don’t cycle with Extreme Endurance. You take it consistently, like a multivitamin; for training, performance, heart-lung function, and for better body pH and alkalinity.
Can an athlete take Extreme Endurance if under the age of 18?
We encourage a parent to email info@xendurance.com and provide the sport and activity level of their child and their age, and weight. We can then provide better guidance for the parent as to the experience we have seen with athletes using the product under the age of 18. We do not recommend anyone under the age of 14 use Extreme Endurance.
When should you take Extreme Endurance? What time of day?
The most important thing to remember when taking Extreme Endurance is to take it consistently like you would a multivitamin. You can split the morning and evening dosage to the time of the day that works best for you. Ex; If you take it at 6 am and 5 pm, we encourage you to try to take it around 6 am and 5 pm everyday. You can take it with or without food.
What is a “Load Dose”?
The normal dose of Extreme Endurance is 6 tablets per day: 3 in the morning and 3 in the evening. For athletes that will be having a significant event or an “extreme” event such as an ultra-distance race, a state meet, or an event that is more intense than your normal events, we recommend what is called a “load dose”. A load dose is taken 7-10 days out from the event and you increase the dosage to 8 tablets per day: 4 in the morning and 4 in the evening and you take 8 tablets for one day after the event and then drop back down to the normal dose of 6 tablets per day. In 2008, our pro-triathletes started using a load dose and they informed us they had their best results bumping up their dosage, so this is why we tell competitors in every sport to use the load dose.
What sports will benefit from using Extreme Endurance?
Since 2008 we have heard from every type of athlete, in every type of sport with the exception of “curling”. We are still waiting for a curler to come forward. So if you are a curler we want to hear from you! Runners, Ultra-distance, Marathon, Triathletes, Crossfit, Cycling, Jiu Jitsu, Swimming, Tennis, Golf, Surfing, Football, Basketball, Baseball, Motorcross, Paddleboarding, Skiing, Boxing, Rugby, Rock Climbing, Wrestling, Hockey - just not curling yet....
