• Mixes well
  • Quick digesting carbohydrates for extra energy
  • High concentration of BCAA's
  • Slightly chalky aftertaste
7.8Overall Score

If you’re a glass half full kind of person, you’ll likely see Scivation’s new Xtend Endurance as a perfect addition to the Xtend product line.

If you tend to view things as half empty, however, Xtend Endurance might feel more like a shameless money grab. By comparing Xtend Endurance with classic Xtend, we’ll give you everything you need to know about which one is right for you based on our own experience with Xtend Endurance.

What’s the difference between Xtend and Xtend Endurance?

After researching the ingredients for both Xtend and Xtend Endurance, the two formulas are ostensibly identical. The only salient difference between the formulas is the carbohydrate matrix found in Xtend Endurance.

The table below provides a quick comparison:

Xtend Xtend Endurance
7000 mg BCAAs 7000 mg
3500 mg Leucine 3500 mg
2500 mg Glutamine 2500 mg
1000 mg Citrulline 1000 mg
1171 mg Electrolytes 1171 mg
640 mcg Vitamin B6 640 mcg Vitamin B6
25g Carbohydrates (Maltodextrin, Cluster Dextrin, Waxy Maize)

My Personal Experience with Xtend Endurance

It may have just been mental boost, but when I sipped on Xtend Endurance throughout my workout I felt like I had plenty of energy from start to finish. I felt just as fresh on my last set as I did on my first.

It mixes well in a shaker cup and there was little to no foaming at all. It’s also a light taste as opposed to other intra-workout supplements I’ve tried which tend to be thick and chalky.
On the other hand, I didn’t like the taste. I used the blue raspberry flavor and it tasted a little too artificial for me.

What Does the Research Say About Xtend Endurance?

Branch chain amino acids or BCAA’s, have a large volume of research detailing their effectiveness for improving exercise performance. One study published in the Journal of Nutrition effectively demonstrated that BCAA’s have key enzymes which improve protein synthesis.[1]

By improving protein synthesis, you drive more amino acids into muscle cells and create an optimal environment for muscle growth and recovery.[2]

Xtend Endurance also features the amino acid glutamine, which boosts the immune system and plays an integral role in post-exercise recovery.[3]

A study published in the British Journal of Sports Medicine showed supplementing with L-glutamine 30 minutes after exercise reduced muscle damage and decreased delayed onset muscle soreness.[4]

Another performance enhancing amino acid is citrulline. The body is capable of recycling and converting citrulline back into arginine, making it an effective nitric oxide booster.

By elevating nitric oxide levels you’re able to flush more blood, oxygen, and nutrients into muscles. This improves muscle pumps, which leads to greater strength and lean muscle gains.

A study published in the Journal of Strength and Conditioning Research showed citrulline not only improved anaerobic performance, but relieved muscle soreness as well.[4]

Final Thoughts On Xtend Endurance

Although I felt the taste of the blue raspberry flavor was too artificial, I did notice more strength and endurance throughout my workout. Xtend Endurance is great if you typically feel weak or tired by the end of your workout and need some quick-digesting carbs to keep strength up.

If you don’t need the extra carbohydrates or are worried about the additional calories, the classic version of Xtend is still available.

[1]Blomstrand E, Eliasson J, Karlsson HK, Köhnke R. Branched-chain amino acids activate key enzymes in protein synthesis after physical exercise J Nutr. 2006 Jan;136(1 Suppl):269S-73S

[2]Stoppani, Jim, Fail to Grow 87508915, Feb2010, Vol. 27, Issue 12

[3]Somayeh Namdar Tajari, Mona Rezaee, Naghme Gheidi Assessment of the effect of L-glutamine supplementation on DOMS, Br J Sports Med 2010;44:i43

[4]Pérez-Guisado J, Jakeman PM Citrulline malate enhances athletic anaerobic performance and relieves muscle soreness. J Strength Cond Res. 2010 May;24(5):1215-22

About The Author

Brian E. is from southern California and has worked for names like GNC and Vitamin Shoppe as a supplement expert and consultant. He currently lives in Utah and is studying marketing.

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