Xendurance

JOIN 300,000+ CUSTOMERS

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.


As seen on

GOODBYE SORENESS
HELLO PERFORMANCE

4.9/5.0 (1,000+ Reviews)

BUY NOW

1

26% Reduction of Lactic Acid = Less Muscle Soreness

2

39% Reduction of Oxidative Stress = Improves Performance

3

6x Reduction of Creatine Kinase (CK) = Muscle Recovery

4

Increase in Aerobic Threshold = Better Vo2 Max

5

Benefits within 72 hours

6

Certified by Informed-Sport

PROVEN IN 12 CLINICAL STUDIES

Journal of Athletic Achievement (2016)

ENA Conference, Vienna Austria (2010)

JOIN 300,000 CUSTOMERS OVER 10+ YEARS

  • Abdiel Crespo 

    5/5

    If you are looking to recover faster and feel stronger and with a better engine you must have Extreme Endurance on your side. It is the only supplement that you should not stop taking.

  • Veronika D’Alfio

    5/5

    Perfect product. Been taking it for a week and already fed the difference. I bought a few products and will be getting more, also signing up for a membership soon. Thanks

  • Natalie Collar

    5/5

    I started using Extreme Endurance in October 2020 after I noticed a difference in one of my teammates at a fitness competition. I won’t be without it now. I have noticed a significant improvement in my endurance and breathing not only during workouts but just in my daily living. And I’m 60 years young!!!

  • Shawna Norton

    4.5/5

    I LOVE this product. As a competitive CrossFitter looking to get to the next level, I need to be doing everything within my power to support my training. I feel like Extreme Endurance allows me to keep pushing and to continue to test my limits!

& TRUSTED BY WORLD CLASS ATHLETES

Donavan Brazier

800M AMERICAN RECORD HOLDER

Craig Engels

1500M USA TRACK TEAM

Josh Bridges

FORMER NAVY SEAL & CROSSFIT GAMES ATHLETE

Danielle Brandon

3x CROSSFIT GAMES ATHLETE

Any runner or weekend warrior like you works out to push the limits and reach new heights. We’ve developed a super-supplement to help power your along the way, allowing you to train longer and harder with less damage and strain. 

Best Value

60 Day Supply

$181.93

$259.85

$78 in Savings + $100 Product Rewards

Take Advantage of The Savings:

25% OFF Extreme Endurance

FREE Omega+D3

Team XND Membership

FREE 2x $50 Rewards

FREE SHIPPING

60 Day Guarantee

Most Popular

60 Day Supply

$115.90

$179.85

$39 in Savings + $25 Product Rewards

Improve Your Fitness:

FREE Omega+D3

FREE $25 Gift Card

FAST SHIPPING

60 Day Guarantee

Single Purchase

$52.16

$67.95

$10 Product Rewards

Try out Extreme Endurance:

FREE $10 Gift Card

FAST SHIPPING

60 Day Guarantee

Recover Faster, Live Better

  • 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