• XENDURANCE - Lactic Acid Buffer

XENDURANCE - Lactic Acid Buffer

  • Product Code: EE
  • Availability: In Stock
  • £39.95

Xendurance Is Clinically Proven To Reduce Lactic Acid By 15-26%

PROVEN. Over a decade of testing and the data to support it.

Reduce soreness, improve stamina, and accelerate recovery. Gain the same advantages used by Olympic, professional, and elite athletes.

Every single batch of Xendurance is tested for banned substances by the world class sports doping control laboratory, HFL Sport Science. In order to provide re-assurance that the product is suitable for use by elite athletes, the product is approved under the Informed-Sport and Informed-Choice programs.


  • Clinically Proven to reduce Lactic Acid by 15-26%
  • 39% Reduction in Oxidative Stress 
  • Speeds Recovery
  • Reduces Muscle Soreness
  • Certified Drug Free
  • 6x lowering of CK (Creatine Kinase) Levels 

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease. 

Xendurance is a revolutionary athletic performance formula created by athletes for athletes. This formula has a Published, Gold-Standard, third party, double-blind, placebo-controlled, crossover study backing up claims of 15% reduction in lactic acid and a double digit increase in aerobic threshold. Many companies make claims on individual ingredients but Xendurance has a published study on the formula itself.

Each batch of Xendurance is tested to ensure that it is not contaminated with banned substances to provide additional reassurance for elite athletes.

Why is this important?

Read Comparative incidence of the presence of banned substances in raw ingredients/materials sourced from global suppliers – summary of findings

P. Brown, C. Judkins, D. Hall, HFL Sport Science Ltd, Newmarket Road, Fordham, Cambridgeshire. CB7 5WW

As an athlete you already know the harder you exercise and compete, the more acid builds up in your muscles. Both your blood and muscle pH goes down into the dreaded acid zone. The increased use of muscle glycogen for energy produces lactic and pyruvic acid. Acidity reduces muscle power and reduces physical and mental endurance. You, your trainers and your coaches refer to this as lactic acid buildup or lactic acid fatigue. On the practice and playing field, it is also called "hitting the wall" or having the "bear jump on your back". It's simple. The harder you compete, the quicker you Go Acid! The Athlete who "Goes Acid" last, wins the competition.

Intramuscular acidosis, is when your muscles have too much excess acid. This condition is caused by the production of H+ (Hydrogen ions) which is part of the energy released from the breakdown of glucose. As your muscles "go acid", this creates fatigue and muscle burn, which you feel during intense exercise. The Xendurance formula and physical chemistry of its 9 ingredients not only assures you that it will buffer production of H+ (Hydrogen ions) and help prevent the acid buildup in your muscles, but it has also been clinically proven to increase aerobic threshold so you can work harder for a longer period of time.


Every athlete should know about proper pH balance. PH balance is critical to top athletic performance. PH is measured on a 14 point scale. The lower pH value range, such as stomach acid could average between 1.0 to 3.0. A pH value of 7 is neutral. The arterial blood pH value of a healthy human ranges around 7.35 to 7.45, which is slightly alkaline. As our body uses fuel and metabolizes food, we produce acid waste which is part of the process of energy release from the breakdown of glucose. The body has numerous ways to remove this acid waste or try to neutralise this acid buildup. Our kidneys filter blood and excrete acids through urine. Our lungs release carbon dioxide and we sweat acids out of our skin. We also have built in acid buffers to help neutralize pH imbalances like calcium, hemoglobin and phosphorous to name a few.

Your body's acid concentration increases as you produce lactic acid. Lactic acid is split into Lactate (Lactate ions) and Hydrogen ions. H+ (Hydrogen ions) is the acid in Lactic acid. Lactate is good and is an extremely fast fuel that is preferred by the heart and muscles during exercise. Lactate is vital for ensuring that your body gets a steady supply of carbohydrates. H+ (Hydrogen ions), the other half of Lactic Acid is not good, especially when the acid concentration exceeds the body's ability to no longer neutralise or flush the waste from your body.

Clinical Study Proving Effectiveness of Xendurance

A Gold-Standard, *third party, double-blind, placebo controlled, cross over study, was conducted on Xendurance whereby twenty-two (22) elite athletes were given baseline tests. Each athlete was given dosage protocol and either product A or product B. When the final test results were completed, the 22 athletes showed an average lactic acid reduction of 15% and an increase of aerobic threshold by double digits. All athletes reported less muscle burn and faster recovery with less muscle soreness.

*(third party testing means that Lifespan International, the parent company of Xendurance, had no knowledge of what testing facility would be used and did not choose the testing facility)

This clinical study was published in the Clinical Journal of the European Society for Clinical Nutrition and Metabolism, (vol 5, supplement 1, 2010) and presented at the March 13, 2010, 6th Annual Conference of the EU Nutraceutical Association. - And our testing continues on athletes at Corpus Diagnostik in Hilpoltstein, Germany.

Jürgen Sessner, the lead researcher at Corpus Diagnostik has done over 7,000 Step Tests, (we call them VO2 Max tests in the US) in the last decade and has been testing athletes for 13 years including 3 Hawaii Ironman Champions. He has held over 60 training camps for triathletes and his main one in the last few years has been in Lanzarote, Canary Islands.

Clinical Protocol
Clinical Study
Clinical Publication


Xendurance is tested by the largest sports lab in the world. HFL is located in the UK and its testing of Xendurance is done using gaschromatography with mass spectrometric detection (GCMS) and liquid chromatography with mass spectrometric detection (LCMS). In layman's terms, - if you put one drop of a banned substance in an olympic size swimming pool, this testing would find it. It is costly, but we have many pros who can not afford to have their tests come up positive. HFL's newest testing programs for athletes are called Informed Choice (US) and Informed Sports (EU).

To summarise, there is not another product in the world that has a Gold-Standard, third party, clinical study, that has been published, and has been tested drug-free.



Like a multi-vitamin, you take Xendurance every day, if you train 5 to 6 times per week, take 6 tablets daily; 3 in the morning and 3 in the evening, with or without food, do not chew them as they are digested through the lower intestines. Xendurance is designed to be used everyday, all year long.

FIVE TO SEVEN DAYS BEFORE A RACE OR COMPETITION increase your dosage to 8 tablets a day; 4 in the morning and 4 in the evening and continue this 8 tablets for one day after the race and then drop back down to 6 tablets per day. We suggest this as it helps immensely with recovery.

IF YOU TRAIN 3 TO 4 DAYS PER WEEK, take a total of 4 tablets daily, with or without food.



If you are a pro, amateur or weekend warrior who makes training a part of your health regimen, Xendurance will keep your acid low and your pH more in balance. By adding lots of fruits and vegetables to your diet you can also help lower your body's acid and maintain a more healthy pH.


Xendurance is able to safely buffer the hydrogen ions (H+) acid in lactic acid with powerful buffers. In addition, Xendurance adds second generation ingredients to its formula to address other biochemical changes that occur to an athlete's body during intense exercise, such as tissue damage, oxidative stress, suppression of the immune system and harmful inflammation. These added ingredients are:

Papain, a protease enzyme derived from Papaya, which is a powerful anti-inflammatory that helps repair and rebuild muscle tissue and relieves muscle soreness.
Catechins are added and are one of the most powerful antioxidants to help fight oxidative stress during exercise.
Electrolytes complete this revolutionary formula to assist athletes with the ability to quickly recover and restore balance and maintain the competitive edge.

Supplement Facts
Serving Size: 850 mg
Servings per container: 180
Recommended Dosage: See *Recommended Dosage

1 Tablet Contains Amount Per Serving % D.V.
Xendurance Proprietary Complex
Calcium Carbonate, Papain, Magnesium Hydroxide, Catechins, Bioperine, Potassium,Selenium, Chromium, Magnesium Oxide
850 mg *

* Daily Value not established

Other ingredients: Stearic Acid, Lubritab, Magnesium Stearate


Day One:
Put yourself or one of your athletes on a stationary bike and work-out at a constant 300, 400, or 500 watt pace (the watts may vary for each athlete) - Or choose a Concept 2 Rowing Machine for a timed 2000 or 3000 meter effort. How long did the participant last? The 1st half of the Do It Yourself 10-Day Trial is complete. Record the comments about muscle pain and burn. Make notes about length of time and the athlete's discomfort and post recovery.

Now put the participant on the "Peak Physical Demand" dosage of Xendurance for 10-Days.

Day Ten:
Retest the athlete using the same criteria used above.
In just 10-days, you will see a dramatic improvement in the length of time on the bike or rowing machine and the participant will notice less muscle burn, less pain and quicker recovery…all naturally, safe and certified drug-free!

Day Eleven and On-Going:
Bottom line, we have clinically proven that Xendurance will boost times and performance!

Download Xendurance Brochure

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