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
456 ratings
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I’ve been taking this product for 8+ years. I could tell a difference when took a break for a year in my training and recovery. Can’t recommend this product enough.
Meghan · 5 days ago
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 · June 5, 2026
Love this product! I take it to gear up for my Hyrox races and can absolutely feel the difference