Clinically Proven
For nearly two decades, 12 clinical studies—including two Gold Standard, double-blind, placebo-controlled, published trials—have proven Extreme Endurance delivers powerful results. These trials reveal less soreness, enhanc...
Reviews
4.9
427 ratings
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If you live Hawaii, consider this. Great product, IF it ever arrives. I am now 2-weeks without product and they keep blowing up my phone and emails with stupid emails and txts requesting videos and updates on progress and I DONT KNOW WHAT TO SAY BECAUSE I HAVEN’T BEEN ABLE TO STAY CONSISTENT! Not sure if Xendurance is too small of a company. I assumed that they were big enough but they can’t seem to get product to Hawaii in less than a month. I guess their way around that is offering free shipping with no other option as a member on standing order, but if you are in Hawaii and you want to stay consistent on your supps without ever running out then order your first order 3-month supply advance or choose another product. The shipping is so inconsistent it’s frustrating and you will never get customer service on the phone in less than two days. I stand corrected. They are consistent…. Consistently messed up on their S/H. IF YOU LIVE HAWAII, take this into consideration.
Charles · 2 days ago
Gives the extra boost needed.
It is definitely delivering. I have been trying to get back into running and it was very difficult and this product seems to have given me that little extra boost I have needed to push myself a little further each time. Less muscle and joint pain as well
D
Dennis · May 29, 2026
I love this stuff. I’ve seen a huge difference in my workouts! This is my 2nd bag for a reason! Placed 2nd in a competition for the first time ever this past weekend.