• Train Harder
  • Recover Faster

Extreme Endurance

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The World’s #1 Endurance Supplement for Stamina, Recovery and Soreness.

Clinically proven to:

✔️ Reduce Lactic Acid by 26% - Less Muscle Soreness

✔️ Reduce Oxidative Stress by 39% - Fights Free Radical Damage

✔️ Reduce Creatine Kinase by 6X - Faster Recovery

✔️ 41% Increase in Aerobic Threshold 

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Monthly
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Delivered every 12 months

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Why You’ll Love It

✔️ Break Through Limits – Clinically proven to reduce lactic acid by 26%, helping you push through fatigue.

✔️ Boost Stamina & Endurance – Supports oxygen efficiency and aerobic capacity, so you can go further without burning out.

✔️ Scientifically Backed Formula – Developed with 12+ clinical studies, NSF Certified for Sport® and trusted by elite athletes.

✔️ Fight Oxidative Stress – Lowers oxidative stress by 39%, protecting your muscles from breakdown and improving long-term performance.

Don’t believe the hype? Here’s the proof.

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Tried. Tested. Loved.

World’s #1 Endurance Supplement

Recover Faster

Fights Free Radical Damage & supports crucial cellular functions.

Stamina Increase

Proven increase in VO2 max (heart-lung function)*

Deeper Breaths

Increase VO2 Max & Aerobic Threshold. Perform better for longer.

Increase Power

Increase power output by 10-25% with a similar heart rate.

Age Slower

Promotes anti-aging by reducing damaging oxidative stress.

Reduce Lactic

Reduces lactic build up for a healthier more energetic you*

Proven by Clinical Studies

Trusted by 100,000 Athletes

Trust is EVERYTHING... That's why Extreme Endurance is used by world-class performers like Josh Bridges to help their chances to get on top of the podium.

Josh Bridges

There’s a noticeable difference in my soreness when I’m not on this product. There's a reason I’ve used this product for over 12 years consistently! And you would be surprised to know how many top Crossfit athletes use Extreme Endurance to get to the podium.

Danielle Brandon

I’ve been taking Extreme Endurance since 2017. This is my secret and I don't like to talk about it. It’s the best recovery tool. If you want to be a savage, get on EE!

Jacob Heppner

I started using Extreme Endurance in 2016 while training for the CrossFit Games and instantly noticed a boost in my overall performance and recovery. More recently, I’ve been taking it alongside my Bike Erg FTP Program, and the difference in stamina and reduced muscle soreness has been huge.

One Week Challenge

See proven results in 7 days

Day 1

Record a workout before taking Extreme Endurance.

Day 2-7

Start taking Extreme Endurance and don’t skip any days.

Day 8

Retest workout from Day 1 and see your performance increase.

Day 8+

Maintain daily dosage for compounding benefits.

Clinically Tested in 12 Studies

Extreme Endurance has been proven effective under rigorous clinical trials. See the results below.

Lactic Acid Reduction of 26%

This second study follows the published clinical study conducted in Germany in 2010, which showed the average lactic acid reduction was 15% in 22 elite athletes with an increase in aerobic threshold by double digits in a short, ten-day period.

Extreme Endurance vs the Competition

When you’re ready to channel your inner titan and recover like a champion, Extreme Endurance delivers unmatched results that are tough to surpass*

BENEFITS XND OTHERS

Since 2008, Extreme Endurance has been the go-to choice for world champions and game medalists aiming for podium success*

Backed by 14+ clinical studies, 2 published studies and open-label testing, delivering proven results since 2008

Proven to reduce oxidative stress by 39%, reduce lactic acid by 26%, 6X reduction of creatine kinase and Increase VO2 max

First US sports nutrition supplement to be Informed Sport Certified starting in 2008

Getting the most out of Extreme Endurance

Frequently Asked Questions

Customer Reviews

Based on 2096 reviews
87%
(1820)
5%
(112)
2%
(45)
1%
(25)
4%
(94)
A
Ashley Taylor
Happy with results

I started taking xendurance before my last marathon and ran a PR of 3:07 at 43.

Thank you for sharing your success with Extreme Endurance. Your performance is truly impressive! We strive to provide products that deliver on their promises, so it's great to hear that our product is working for you. 💪 Keep pushing to the extreme!

M
Monique
Great product!

Was able to feel a difference on the third day taking it. It really is something! I doubted at the beginning, but it really does help a lot with recovery!

Thank you for your review! We are thrilled to hear that you have seen great results with Extreme Endurance in just three days of taking it. We are glad to have helped with your recovery and appreciate your trust in us. Keep up the great work and continue to push yourself to the next level!

S
Sam
Awesome

The actual product effects, everything has exceeded my expectations.

Thank you for your review! We are thrilled to hear that the Extreme Endurance is delivering great results for you. We appreciate your support and hope you continue to enjoy its benefits. 💪 Keep pushing to the extreme!

S
Sara Lee
NIce

This product helped me with my training, my performance and to recovery.

Thank you so much for your review! We are thrilled to hear that you find Extreme Endurance helpful in your fitness journey. We are always striving to provide the best products for our customers, and we are glad it has made a positive impact for you. Keep up the good work and happy training!

N
Noah Groover
Love the products!

I've been using Xendurance products for about 4 months now. My training is going very well, I feel my ability to recover has improved, and my total output is greater.

Thank you for your kind words! We are so glad to hear that you are enjoying Extreme Endurance and that it has been beneficial to your training. It's great to hear that your recovery has improved and that you are seeing an increase in your total output. Keep up the great work!

G
Gabriela Chacon
Amaizing

I found it incredible, it has helped me improve my training, my performance and to recover from them quickly, I am very happy and satisfied.

Thank you for choosing Extreme Endurance! We are delighted to hear that it has been such a beneficial addition to your training routine, helping you improve your performance and recovery. Your satisfaction is our top priority, and we hope to continue providing you with the best results. Keep up the great work!

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