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During periods of intense exercise, your body burns through energy sources like glutamine and glycogen, along with proteins and amino acids. This is sweet for a while, but eventually the byproduct of this process—ammonia—starts building up and interfering with efficient muscle function. Hammer Nutrition's Anti-Fatigue Caps combine the ammonia-gobbling compounds potassium/magnesium aspartate (or aspartic acid), L-Citroline, and ornithine alpha-ketoglutarate (OKG) to hunt down and gobble up ammonia, so your energy output won't fade as quickly as it otherwise might.

That's not all Anti-Fatigue Caps do, though. They also help absorb other toxins from the bloodstream and liver, aid the function of RNA and DNA, stimulate the immune system, and prevent muscle breakdown. Just pop a few during or after a race to stay strong and recover faster, and be ready to feel silly for never doing it before.

  • 90 servings

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Here's what others have to say...


Believe the hype - these work awesome

  • Familiarity:I've put it through the wringer

OK - so I've been a LOYAL Hammer Nutrition supporter for years. After my first half mary about 10 years ago, and then lagging performance after - I thought I needed to review my fuel strategy. I don't recall where I stumbled on Hammer, but their products are first rate! I've been using them for over 10+ years.

Anti-fatigue caps help to offset the bi-product that your muscles give off when burning O2. I definitely notice a difference - especially AFTER a run or hike because I'm not cramping up. Since I found these, I've never done a long run or hike without them.

Definitely able to be stacked with other supplements, I don't go for a run or a long hike without these in reserve.