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Arms Race Nutrition

Harness | Pre-Workout

Harness | Pre-Workout

  • Power
  • Focus
  • Energy
Regular price $44.99 USD
Regular price $44.99 USD Sale price $44.99 USD
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HARNESS is a comprehensive pre-workout solution scientifically-formulated to increase your athletic performance. Key ingredients in HARNESS have been demonstrated to increase VO2 max, voluntary maximum contractile force, and total time to fatigue, while simultaneously decreasing feelings of fatigue.

  • 6g L-Citrulline
  • 3.2g Beta-alanine 
  • 254mg VasoDrive-AP ®
  • 250mg Cognizin
  • 150 ElevATP®
  • 75mg ZumXR™ (XR Caffeine)
  • Servings per container: 20 (40 scoops)
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  • VasoDrive-AP®

    Enhances blood flow and improves pumps. Vasodrive is a patented ingredient derived from casein that works by inhibiting enzymes that cause vasoconstriction. This allows for much more efficient blood flow, reduced blood pressure, and stronger muscle pumps.

  • elevATP®

    ElevATP® is a blend of specific polyphenols that works to increase endogenous ATP levels. ATP is the primary molecule that acts as a carrier for energy within cells, involved in processes like cardiac function, blood flow, muscle contraction, and neurotransmission. Increased ATP can have a positive impact on power, strength, and overall exercise performance.

  • Cognizin®

    Cognizin is a patented form of citicoline that provides both choline and cytidine and has abilities to enhance mental focus, boost brain energy, provide neuroprotection, and improve overall cognitive function.

  • zümXR®

    Züm-XR is a patented coating technology that allows the dissolution of certain ingredients, primarily caffeine, to have a longer lasting effect in blood serum levels. Züm-XR takes well over 120 minutes to complete the process of dissolution compared to your typical immediate release caffeine.


HARNESS is our comprehensive pre-workout solution scientifically formulated to increase your athletic performance. Key ingredients used have been shown to increase VO2 max, voluntary maximum contractile force, and total time to fatigue, while simultaneously decreasing feelings of fatigue.


Mix 2 scoops (1 serving) with 8-12 fl oz of water and consume approcimately 15-30 minutes prior to your workout.

To assess tolerance, new users may want to start with 1 scoop (1/2 serving).




ARN Harness RTD deliver the same energy, focus, and pump as our original HARNESS pre-workout powder, but they are conveniently 'ready to drink' - no need for a shaker or water!


What's Supp!?


Is Harness for me?

HARNESS can be used by anyone looking to improve their performance in the gym. Whether you are a bodybuilder, cross-fit athlete, or just everyday gym goer, HARNESS can help you achieve your full potential. Of course, if you have any questions about if caffeinated products are right for you, always consult your primary care physician prior to use.

How much caffeine is in Harness?

Two types of caffeine: standard caffeine anhydrous AND trademarked ZumXR, an extended release caffeine that promotes long lasting energy with no jitters and no crash

Caffeine Anhydrous: 1 scoop: 175 mg/2 scoops: 350mg

ZumXR: 1 scoop: 37.5 mg/2 scoops: 75mg

I loved the original, what's changed?

We've swapped Vinitrox™ for 254mg VasoDrive-AP®.

By replacing Vinitrox™ with VasoDrive-AP®, a patented ingredient derived from casein, blood flow efficiency is improved through the inhibition of vasoconstriction-causing enzymes, resulting in reduced blood pressure and stronger muscle pumps.

We've also replaced the generic citicoline for Cognizin® Citicoline and added Bitter Orange Extract. This natural source of a compound called synephrine, which has benefits ranging from increased energy levels, enhanced fat burning, improved athletic performance, and enhanced oxygen uptake.

Can I stack it with Daily Pump?

Absolutely! We actually recommend combining the two to get the most out of your workout performance. Smooth, clean energy plus a killer pump! A match made in supplement heaven.