Bestseller

Extreme Endurance

Name: Extreme Endurance
Brand: Xendurance
SKU: EE
Price: 59.95 USD
Availability: InStock
Rating: 4.72 (1747 reviews)

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

One time purchase -

For our monthly subscribers -

For Our Monthly Subscribers -

Free Shipping + $100 in Rewards -

Money Back Guarantee

Same Day Shipping

Become a Member & Save 25% OFF

Purchase a Team XND Membership and receive:

25% Off Sitewide
$100 Worth of Product Rewards
Free US Shipping.
No Order Minimums. Exclusive Partner Perks

Description

Clinically Proven.

For over a decade, 12 clinical studies have proven the benefits of Extreme Endurance. Two of those studies are Gold Standard, double blind, placebo controlled, published studies. The results of those studies show a reduction of soreness, improvement in stamina and an accelerated recovery. In a 10-day clinical study, Extreme Endurance had an astounding 39% reduction in oxidative stress, which helps promote anti-aging benefits and cellular health. Numerous sources believe oxidative stress is the leading cause of many of our degenerative diseases. World class athletes have trusted Extreme Endurance since 2008 for performance benefits and the ongoing science has shown overall health advantages for everyone concerned about balancing their body’s pH and supporting cellular function to fight free radical damage*

Clinical Studies:

Key Benefits

The Benefits of Daily Use:

26% Reduction of Lactic Acid -> Less Muscle Soreness / Improves Performance*
39% Reduction of Oxidative Stress -> Fights Free Radical Damage*
6X Reduction of Creatine Kinase (CK) -> Faster Muscle Recovery Time*
Increase in Aerobic Threshold -> Last Longer, Go Harder*
Start feeling the benefits within 72 hours*
Certified by Informed-Sport**

Clinically Proven

Backed by 12 unique clinical studies (two of which are published, Gold Standard, double-blind and placebo-controlled).
Extreme Endurance is arguably the most researched and proven sports supplement in the world.

Natural & Certified Drug Free

Formulated with 100% natural ingredients for ANYONE of any fitness level.

What's Inside

Have peace-of-mind knowing Extreme Endurance is fully compliant with all professional, collegiate and olympic organizations in the world.

This formula contains zero banned ingredients – it’s an all-natural, electrolyte mineral supplement and it’s certified ISO 17025 tested for banned substances. 

✔️ Calcium Carbonate – Strengthens muscle, bone and heart function .

✔️ Papain – Anti-inflammatory that reduces muscle soreness after exercise. 

✔️ Magnesium – Improves muscle function & may boost athletic performance. 

✔️ Black Pepper Fruit – Powerful antioxidant that enriches nutrient absorption .

✔️ Selenium, Chromium & Potassium – Vital minerals for growth & recovery.

Usage

For maximum benefits, it's essential to use Extreme Endurance daily, similar to a multivitamin. Studies indicate that the longer you use Extreme Endurance, the more significant the benefits, so commit to taking it daily.

We have had athletes on Extreme Endurance for 12+ years straight.

Follow the below guidelines for optimal results.

Morning - Take 3 tablets of Extreme Endurance with or without food first thing in the morning.

Evening - Take 3 tablets of Extreme Endurance with or without food before bed.

TRAIN HARDER. RECOVER FASTER. SET NEW PRS.

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 eight years!

Danielle Brandon

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

Craig Engels

The one product I take daily and recommend to everyone is Extreme Endurance. It’s insanely effective and the clinical research backs it. If you want to improve your running this is by far the easiest thing you can do!

Extreme Endurance vs the Competition

When it’s time to unleash your inner-Hercules and bounce back stronger than ever… Its very hard to beat the results you will feel with Extreme Endurance.

BENEFITS	XND	OTHERS
Proven by rigorous scientific research and tested by unbiased 3rd parties.
Proven to reduce lactic acid by 26%
Proven to reduce oxidative stress by 39%
Informed Sport Certified
Made in the U.S.A & backed by our 100% 30-day money back guarantee.

Getting the most out of Extreme Endurance

Frequently Asked Questions

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.

We also recommend that you do not take additional magnesium supplements and if you have a question on dosage please reach out to info@xendurance.com.

Most active people and those that train hard get an adequate amount of magnesium with the daily dose of Extreme Endurance.

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....

Amazing product!

Was skeptical to buy this product but had been really struggling with breathing and building any type of endurance back up since a surgery I had at the beginning of 2024. I have been floored with the growth and results I have experienced since taking it!

Thank you for sharing your positive experience with Extreme Endurance! We are thrilled to hear that it has exceeded your expectations and helped you improve your breathing and endurance after your surgery. We always strive to provide products that truly make a difference for our customers. We hope that you'll continue to use it to help improve your overall fitness and well-being! Keep up the great work!

The Essentials Advantage

Throughout the week, I blend a balanced load of core circuit training, running, walking & handball (indoor & outdoor). Before taking Essentials 2x daily, my joints would be achy & sore. Now my body recovers quickly & w/ discomfort!

Awesome! Thank you for taking the time to leave a review for our product, Essentials. We're thrilled to hear that it has helped you with your active lifestyle and recovery. Our goal is to provide our customers with the best support for their joints and overall well-being. Keep up the great work!

The next level you need to unlock your full potential.

Energy sustained with tier A performance. Definitely Essential in my progression. My secret is exendurance. No soreness or cramps. All work and strength 💪🏿 I do kickboxing amd crossfit 6 days a week both classes for 5 days and this has been a next level to seeing progress...

Thank you for choosing Extreme Endurance! We are thrilled to hear that it has helped you unlock your full potential and sustain your energy with top-tier performance. Cheers to no more soreness or cramps. Keep pushing to the next level!

Incredible!

I was a skeptic trying this…but after only a week I noticed a major improvement in my VO2 and stamina. I’ll be interested to see the long term results given only a week’s success.

Thank you for your review! We're thrilled to hear that Extreme Endurance has made a positive impact on your VO2 and stamina after just one week. We're confident that with continued use, you'll see even more impressive long-term results. Keep up the great work!

Lil bit

I have just started using this product and so far I’ve seen fatigue starting later in my run.
I am looking forward to more experience with this item with more use, right now I’ve seen enough improvement to continue using it regularly.
Got to be all in not just a lil bit in.

Thank you for taking the time to leave a review for our Extreme Endurance product. We're glad to hear that you've already noticed a difference in your energy levels during your runs. We're confident that with continued use, you'll experience even more benefits. Keep up the great work!