Anti-Fatigue Caps
Anti-Fatigue Caps
Anti-Fatigue Caps

Anti-Fatigue Caps

$22.95 EACH
(3+ FOR $19.99)
219 reviews
Eliminate endurance barriers
  • Eliminates “heavy legs”
  • Prolongs endurance
  • Fights everyday fatigue


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made in usa vegan no added sugars kosher informed sport


Anti-Fatigue Caps is truly a “there’s nothing else like it anywhere” supplement, one that greatly extends endurance by effectively neutralizing the fatigue-causing effects of ammonia build-up, often referred to as “the endurance athlete’s worst enemy.” Three well-known ammonia-scavenging compounds make up this unique formula, helping to prevent the dreaded “heavy” legs sensation and extend energy output.

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2-4 capsules one hour prior to training. This would provide an initial dose of 500-1000 mg magnesium/potassium aspartate, and 480-960 mg of OKG, an excellent dose at the onset of an endurance workout or race.

An additional 1-2 capsules each hour, at the two-hour mark and beyond, during extended endurance sessions is also suggested.


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Potassium/Magnesium Aspartate – This compound is comprised of potassium and magnesium chelated (aka “bonded”) to the amino acid aspartic acid. It often used for alleviating general fatigue and is sometimes involved in treatment regimens for Chronic Fatigue Syndrome.

L-Citrulline – This amino acid is found in foods such as watermelon, onions, and garlic. L-citrulline assists in the removal of ammonia in the muscles and liver. Like aspartic acid, it is beneficial in alleviating fatigue.

OKG (Ornithine Alpha-Ketoglutarate) – A combination of the amino acid L-ornithine and the compound alpha-ketoglutarate. OKG provides a readily available, non-ammonia-producing source of glutamine in the body. Both L-ornithine and alpha-ketoglutarate act as ammonia scavengers in the body.

Beet Juice Powder – While the primary function of this ingredient is coloring the capsules to easily differentiate them from similar-looking capsules such as Endurolytes, beetroot powder also boosts nitric oxide levels.

Anti-Fatigue Caps
Supplement Facts
Serving Size: 4 Capsules
Servings Per Container: 22.5
  Amount Per Serving % Daily Value*
Potassium Magnesium Aspartate 1000mg
Magnesium (as magnesium aspartate) 100mg 12%
Potassium (as potassium aspartate) 140mg 2%
OKG (Ornithine alpha-ketoglutarate) 700mg
L-citrulline 700mg
* The Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
† Daily Value not established.
Other Ingredients: Beet Juice Powder, Stabilized Rice Bran, Vegetable Capsules (plant cellulose and water)

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.
Customer Reviews
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Phil C.
United States United States


Would not have survived the 206 mile ride without anti fatigue caps and race caps supreme. Enderolytes in the water. Failure on my part to eat the first day. Just a light breakfast, three hammer gels and a Kind bar. Second day no food for the first 50 miles. All the supplements help an unprepared, under trained, over weight fellow to finish. I will purchase all products repeatedly. Should really train for that 6 miles daily. Max 50 total from winter. They really work.

A Hammer Nutrition Customer
Nate L.
United States United States

great addition to my event essentials

I use as directed to fight fatigue during long train and events.

A Hammer Nutrition Customer
United States United States

No heavy legs again!

Taken as directed before and during exercise prevented the afternoon slump and heavy leg syndrome the next day. Amazing stuff!

Link G.
United States United States

Definitely Effective

While a bit on the nose, the name is very accurate. I have used anti-fatigue caps for years and they make a noticeable difference and keep your muscles going harder for longer. Even my anti-supplement friends use these now, usually after I gave them some when they bonked early on a long hike and couldn't understand how I was still going strong. It won't make the hard work easier but it will enable you to do the hard work longer.


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