Pre-Training Formula for Bigger, Better Workouts*
Helps Promote Energy, Strength, and Testosterone and Reduce Feelings of Fatigue*
9.1 out of 10  (544 Reviews)
4 Sizes
12 - 10 Fl. Oz. Bottles
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2 Flavors
Orange Ice
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Price: $26.49 ($2.21 / Serving)
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Product Overview

Testosterone Supporting Pre-Workout
GAT Nitraflex. Hyperemia and Testosterone Enhancing Powder*


TeamGAT Athlete 2015 Arnold Champion

Citrulline Malate

The Most Seething Intensity

The Most Seething Intensity. GAT Sport Nitraflex bottle image
New Instant Exhilarating RTDs
12 Pack Case - 10 oz. Single Serving Bottles
The NITRAFLEX Advantages:
  • highly Concentrated
  • More than 3X Strength
  • Clinically Studied CFB+ Vascoactive Compounds
  • Amazingly Delicious Flavors
  • 1 Scoop Potency

NITRAFLEX is a clinically tested, high-intensity pre-training formula with potent ingredients to help magnify energy, alertness, strength, stamina, pumps and enhance Testosterone during workouts.*

GAT Sport Nitraflex. Same level potency on key ingredients!

Ratings & Reviews

Overall Rating
544 Ratings
Verified Buyer Rating
287 Ratings
Average Flavor Rating
11 Flavors
Top Rated Flavor
Pina Colada
By clicking the button above, you agree to entering the Reviews section. Products in the Store are not intended to diagnose, treat, cure, or prevent any disease.
Verified Buyer

Not impressed. The "tingle" lasts for about 5 minutes. There was no obvious increase in my pump. No additional reps gains. I won't buy again.

Verified Buyer
  • 10 Orange
  • 9 Pina Colada
  • 10 Black Cherry

I've tried many other brands of PWO, but I always come back to Nitraflex. Gives me enough energy for my workout and a little more for cardio afterwards. Black cherry and orange are both great flavors, I thought Pina Colada was just too sweet.

Verified Buyer

Compared to other prework outs I've tried this one is probably my favorite. A full scoop gives me plenty of energy without scratching my eyes out and ears off. Tastes good, mixes well. Has a little extra noticeable test boost. Man oh man do I sweat with this product though. I guess thats a good thing depending on your goals. Will buy again.

  • 3 Blue Raspberry

After I returned the PMP to GNC, I got a tub of this thinking I might have better results. I have, but nothing noteworthy. It's marginally better than PMP at best, honestly. I can feel some energy, but not a whole lot, and my pumps aren't any different than if I'd gone without using this. It's unfortunate, but oh well. Not everything can work for everybody. But I do have to say that blue raspberry tastes rather unpleasant, like nasty cough medicine.

Verified Buyer
  • 1 Black Cherry

Has to much caffeine no one needs 325mg before a workout. Took Nitraflex for a week and threw it away. My workouts suffered more than they benefited from this garbage supplement. You are better off taking Pre JYM or similar pre workout. I hope this helps someone I regret trying this out. I am 6'8" 287lbs

† This price is the retail price for this product found at one or more retail websites in the last 30 days. The price may not include shipping cost, tax, sale or promotional prices, or discounts such as member pricing. Prices may change. verifies this price every 30 days.
7 Servings
7 Servings
$1.57 Per Serving
8 Packets
8 Packets
8 Servings | $1.53 Per Serving
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12 - 10 Fl. Oz. Bottles
12 - 10 Fl. Oz. Bottles
12 Servings | $2.21 Per Serving


Serving Size: 10 fl. oz. (295.74 mL)
Servings Per Container:12
Amount Per Serving % DV
Calories 10       
Carbohydrate 2 g 1%
Niacin (as Niacin) 75 mg 375%
Sodium 25 mg 1%
Vasoactive Arginase-Regulating No Precursor Complex       
Citrulline Malate, L-Arginine Malate, L-Arginine, Alpha-Ketoglutarate
Acute Energy, Focus, Intensity, Neuromodulating, Endurance Complex       
Beta-Alanine (as Carnosyn®), Caffeine, N-Acetyl-L-tyrosine
Clinically-Studied Testosterone-Enhancing Complex       
Calcium Fructopyranose Borate (CFB) FruiteX-B® US Patent #5,962,049
** Daily Value not established
Other Ingredients:
Water, Natural and Artificial Flavor, Potassium Sorbate, Malic Acid, Sodium Benzoate, Sucralose, Acesulfame-K

Directions For NITRAFLEX:


Training days: Day 1: Begin by assessing your tolerance with half a serving of NITRAFLEX™ mixed with 6oz of cold water. Days 2 and beyond: Depending on tolerance, mix 1 serving (1 scoop) of NITRAFLEX™ with 10oz of cold water and consume within 30 minutes before working out.

Non-training days: Take 1 serving (1 scoop) upon arising in the morning or before any physical activity. Do not take more than 1 serving in a single 24-hour period. Do not take within five hours of bedtime.


Consume one 10 fl oz bottle of NITRAFLEX® within 20-30 minutes prior to working out. DO NOT CONSUME with any other products containing CAFFEINE with this product.

Warnings: This product is strictly intended for use by healthy persons 18 years of age or older. Each serving (1 scoop) contains 325 mg of caffeine. Do not combine with other caffeine- or stimulant-containing products. Follow the instructions for assessing your tolerance. Do not use if you are pregnant, nursing or trying to become pregnant. Do not use if you are currently unaware of your health status or if you have a medical condition including but not limited to heart, liver, kidney, or thyroid disease, psychiatric or epileptic disorders, high or low blood pressure, cardiac arrhythmia, recurrent headaches, enlarged prostate or glaucoma. Do not use if you are taking prescription or non-prescription medication of any kind including but not limited to MAO inhibitors, anti-depressants, aspirin or non-steroidal anti-inflammatory drugs. Do not use if you are prone to overheating or dehydration. After 8 weeks of use, take 1 week off before resuming use. Discontinue at least 2 weeks rior to surgery or if you experience rapid heartbeat, dizziness, severe headache or shortness of breath. Do not take within five hours of bedtime.

* 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.
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