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.

A man running on a track during a race wearing a blue and white uniform.

#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


Increase Performance

Improve Power & Vo2 Max 10-25%

Recover Faster

6X Reduction of Creatine Kinase

Less Muscle Soreness

26% Reduction in Lactic Acid

Endorsed by:

Trusted by

World Class Runners

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

ENA Conference, Vienna Austria (2010)

Journal of Athletic Achievement (2016)

How to

Improve in 72 Hours

Perform a baseline workout.

Take 3 tablets in the AM and repeat in the PM. Train regularly.

Feel benefits in 72 hrs and redo baseline workout.

Test with the


Perform a baseline workout

Take 3 tablets in the AM & PM.
Train regularly

Redo baseline workout in 7 days + feel the results



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60 Day Starter Pack



SAVE $63.95

Experience the World’s #1 Supplement for Stamina, Performance & Recovery.

Try the 60 Day Pack and get:

FREE Omega+D3

FREE $25 Gift Card

2 x Packs of Extreme Endurance

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Join 300,000 Customers

Over 10+ years

Customer Reviews

Based on 1643 reviews
Keith K
A New Staple In My Regimen!!

I started using this about 3 weeks ago. I initially did the 7 day challenge and noticed my stamina/endurance had improved significantly. I was able to go longer/harder during my training routine and had a higher than normal calorie burn.

Since then I've noticed an improvement in both my cardio and weight training sessions. My recovery is improving and I am setting new PR (personal records) every time I walk into the gym.

This will definitely be a supplement I continue to use in my routine going forward.

Cameron Angers

Had my doubts about the effectiveness of a singular supplement. However this supplement has been crucial for recovery (especially putting in 60+ miles and 3-4 strength workouts a week) It used to take multiple days to recover from a hardcore speed workout. Now I’m recovered same day or at least by my run the next morning. Incredible.

Emily Quintanilla
Love this supplement!

I have virtually no soreness. I recover much faster, my VO2max has improved, and performance is much better. I will be buying more and become a member.

Thank you so much for your review! We're thrilled to hear that you're loving our Extreme Endurance supplement. It's great to know that it's helping with your recovery and overall performance. We appreciate your support and look forward to having you as a member. Keep up the great work!

Reaux Brill
The Review of all reviews

As I was taking my last 3 tabs this morning I thought, “ I gave it my best shot, and I haven’t felt any real difference in my training, definitely nothing that would motivate me to re-order” I go for my run (8miles) it was only suppose to be 6, but I was feeling pretty good. Afterwards, I checked my stats and my VO2 increased! 🥳 I had been working on this… it seems like forever. So not only have I re-ordered, I’m a member! 💪

Awesome! Thank you for taking the time to share your success with our Extreme Endurance product. We're thrilled to hear that our product has made a difference in your training and helped improve your VO2 levels. We always aim to provide top-notch results for our customers, and we're so happy to have you as a member. Keep pushing to the extreme!

Better recovery

I’ve only taken this about 10 days. I have noticed less overall soreness. I’ve been building mileage the past 2 weeks so I’m still sore and tired, but I think I’m recovering better. I have not noticed any improvement in stamina while training yet.

Thank you for sharing your experience with Extreme Endurance! As you continue to build your mileage, we hope that our product will continue to help you recover better. While stamina improvements may take some time to notice, we are confident that you will see results in your training soon. Keep up the great work!

Brandy Y
Great product. New increases in FTP!

I was hesitant at first but gave Extreme Endurance a try. I took it consistantly and started see a shift upwards in FTP in about 3 weeks. It has also helped greatly with recovery. I'm a believer and a happy customer!

Thanks for choosing Extreme Endurance! We're thrilled to hear that you finally gave it a try and are seeing such incredible results in such a short time. We hope you continue to see great improvements with our product. Keep pushing to the extreme!

Supplement facts

NON-GMO / Gluten Free / Preservative Free.

Contains no Yeast, wheat, corn, milk, eggs, soy, artificial colors, sugar, starch or flavorings.

100% Guaranteed

Backed by the XND 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

60-Day Money
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