Customer Reviews

Based on 1455 reviews
Craig Nunes
Extra speed

Set so many new P.Rs cycling with this product.

Wow, that's amazing! Thank you for sharing your experience with Extreme Endurance! We hope you continue to see great improvements with our product. Keep crushing those goals!

Cheryl Patterson
Good Stuff

My husband and I were both taking it along with another friend. We all noticed less fatigue after big workouts. Unfortunately, I started to develop some digestive issues so quit using it but have no clue as if the product was the culprit. So, other two users experienced no adverse reactions. I liked the product but will try again later.

Thank you for your review! We're thrilled to hear that you've noticed an improvement in your post-workout recovery since taking Extreme Endurance. While we cannot confirm if our product was the cause of the digestive issues, we always recommend consulting with your doctor before starting any new supplement. We appreciate your feedback and hope you will give our product another try in the future.

Barbara Loparo
Extreme endurance!!

I have come a long way since starting to take these ! My runs are much better and smoother! Great product!!!!!!

Wow, that's amazing! We're so happy to hear that Extreme Endurance has helped improve your runs and overall performance. Thank you for making us part of your fitness journey! Keep up the amazing work!

Wendi Glisson
Xendurance game changer

I am experiencing a noticeable difference and how I feel when I’m training when I’m going hard recovery is awesome and I’ve been crushing workouts

Awesome! We are thrilled to hear that you are loving our Extreme Endurance product! We hope you continue to see great improvements with our product. Keep crushing those workouts!

Marvin Green

This stuff is absolute magic, when they say there's no magic pill for cardio, this is it. I literally have to stop exercising on my own, the lactid acid is non exsist YouTube video placeholder

Awesome! We're glad to hear that Xendurance is working well for you! We hope that you'll continue to use it to help improve your overall fitness and well-being!

Jorge A Cabrera

I ha e been very soar lately...finally endurance arrived. Been taking them for the last two days. Had my first long distance run in a way it just keeps your body from wanting to keep going, not tired just energized. This stuff is amazing it really works...

Thank you for sharing your positive experience with our product, Extreme Endurance. We are so glad to hear that it has helped you during your long distance run and provided you with sustained energy. We appreciate your feedback and hope that our product continues to support your endurance. Keep up the great work!


The ‘secret weapon’ giving athletes an extra edge

Try the World’s #1 Certified Supplement for athletes looking to:

Improve Performance

Increase Endurance

Speed Up Recover time

The ‘secret weapon’ giving athletes an extra edge

Try the World’s #1 Certified Supplement for athletes looking to:

Improve Performance

Increase Endurance

Speed Up Recovery time

Endorsed by:

Tried & Tested by

Over 300K Customers

Proven In

12 Clinical Studies

Recover Faster

Fights free radical damage & supports crucial cellular functions.

Stamina Increase

Push your limits to go the distance, fight fatigue and set PRs.

Increase Power

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

Deeper Breaths

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

Deeper Breaths

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

Reduce Lactic Acid

Extreme Endurance reduces lactic build up after intense workouts.

Age Slower

Promotes anti-aging by reducing damaging oxidative stress.

As proven in:

Journal of Athletic Achievement

ENA Conference, Vienna Austria

Journal of Athletic Achievement

ENA Conference, Vienna Austria



60 Day Money Back Guarantee

60 Day Starter Pack



SAVE $63.95

Experience the World’s #1 Supplement for Stamina, Recovery and Soreness.

Try the 60 Day Pack and get:

FREE Omega+D3

FREE $25 Gift Card

2 x Packs of Extreme Endurance

order now


Money Back



Trusted by

World Class Athletes

  • "I wish I knew about this sooner"

    Matthew Centrowitz

    Olympic Gold Medalist

  • “This is my secret that I don’t like to talk about. It’s my best recovery tool.”

    Danielle Brandon

    Crossfit Games Athlete

  • "My training has really improved and I feel ready to go again the next day."

    Donovan Brazier

    800M World Record Holder

  • “The one product I take daily and recommend to everyone is Extreme Endurance.”

    Craig Engels

    1500M USA Track Team

  • "I have been on this product for over 10 years and swear by it"

    Josh Bridges

    Former Navy Seal & Crossfit Games Athlete

Take a Look Inside

Extreme Endurance is fully compliant and:

Informed Sport

First US company to use trusted global testing method

Gluten Free Preservative Free

Safe for celiacs and no bad fillers.

Zero banned

It’s an all-natural, electrolyte mineral supplement.

Made in
the USA

Proudly made and owned in the USA.

For Athletes and Non-Athletes

+1000 5-Star Reviews

  • It actually works tbh

    "I really thought that I would try this stuff and it would make a difference and I would just get my money back you know? But I just completed a half marathon two minutes under my goal time is amazing!

    Tiffany F.


  • I was skeptical

    "I've been really surprised at the benefits that this supplement has provided. I was skeptical but it's a game changer from my perspective."

    Greg P.


  • Won’t go without it

    “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!”

    Jose T.


  • Got my breath back

    "Whichever discipline I was training in I was finding myself gasping for air. Since starting Xendurance I havent had issues with catching my breath, my runs have improved to where they should be."

    Brandon C.


  • I'm a believer!

    "I'm a newer CrossFit member but sometimes bike and run. I started Extreme Endurance 3 weeks leading up to a sprint triathlon. With little training I somehow pulled off 1st AG and 20th female."



  • Unreal stuff

    "As an Ironman triathlete and ultra runner I am critical about what I use on the daily. X endurance is the real deal. I saw a noticeable change in my performance in literally three days."

    Danielle F.


  • Wish I found this sooner

    "Xendurance is by far the best I’ve used in all the years I’ve been training. After the first month I immediately signed up to be a team member because I knew I wouldn’t train without it."

    Keith C.


  • Got my PR after 1week!

    "I'm a distance runner and had plateaued at my last few races. I was feeling sluggish and just had no energy. I used Xendurance for 1 week and got PRs in both the 1600m and 3200m!"

    Kristen H.


Test via the


Stop moving at a snail’s pace - see proven results within 7 days.

Test via the


Stop moving at a snail’s pace - see proven results in 7 days.

Day 1

Record workout of your choice without 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

See why XND is

Unrivaled & Unmatched



Unbiased & rigorous scientific research

Reduces lactic acid by 26%

Reduces oxidative 
stress by 39%

Informed-Sport Certified

Proudly U.S.A made & owned

NON-GMO Gluten Free Preservative Free.

Gluten Free Preservative Free.

Non-gmo, soy & dairy free,  no artificial colors, flavors or artificial sweeteners, no caffeine or stimulants

Backed by the XND Promise

100% Guaranteed

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

60-Day Money
Back Guarantee


say goodbye to your weak links

Stop making excuses. Recover faster and perform at your best.

Proudly owned, manufactured and shipped in the USA, since 1998.

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*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.