4.73 out of 5 based on 11 customer ratings
(11 customer reviews)

$69.97 $48.99

Musclular volume enhancer. Powerful nitric oxcide booster. Enhanced blood flow.

# 500mg of L-Ctirulline

# 150mg of Creatine Ethyl Ester

# 150mg of Hawthrone Extract

In stock

Product Description

Focused Energy. Real endurance. Easy Delivery.

Preparing your body and mind to work out, anytime, anyplace. Our goal for this creatine infused muscle builder, were to increase energy and circulation, reduce fatigue, improve muscle endurance and sharpen focus.


L-citrulline is a naturally occurring amino acid found in food like watermelons and produced in the body. Our bodies transform L-citrulline to L-arginine and also to nitric oxide, known to produce increased blood flow to the muscles. L-citrulline also may help increase the supply of ingredients the body needs to producing certain proteins. It is also known to improve blood flow, expanding veins and arteries to reduce blood pressure.


L-arginineis converted in the body into nitric oxide, the chemical known to produce the “pump” feeling in your muscles. Nitric oxide causes blood vessels to expand wider for improved blood flow. L-arginine also stimulates the release of growth hormone, insulin and other substances.


Creatine is a popular and powerful sports supplement. Naturally occurring in meat, numerous clinical studies support the supplementation of creatine for increased strength and endurance. Supplementation with creatine increases Cr and CP within the muscle, allowing further capacity to regenerate ATP—critical to muscular output such as weight training. Creatine is especially useful in enhancing the muscle’s ability to maintain high power output through brief periods of high-intensity exercise.

No Artificial Dyes

Many supplements use artificial dyes or “azo dyes,” like Yellow #5 (tartrazine), Blue #1 (Brilliant Blue), Red No. 40 (Allura Red) and the list goes on. While there is some debate about just how dangerous these dyes are to your health, we chose to stay on the safe side and leave these chemical additives out of our supplements. There’s just no point.

No Fillers

Our supplements follow a simple maxim every ingredient has a purpose and scientific research backing it. We don’t waste your time with fillers and every ingredient is presented at clinically effective dosages to put that extra bounce in your step, help you complete those last couple reps. Our goal is to help you go the extra mile, not fill your pre-workout with extra, unnecessary garbage.

Bottom Line…

There’s a reason we call these “Muscle Builder Tablets.” Fuel your muscles for greater performance and endurance. Recover faster and get that full, pumped feel from your workouts. The creatine used in our Muscle Builder Tablets sets a standard to which other supplements fail to compare. Don’t waste your time with fillers, dyes and phony additives. Go for what’s real, go for what works. Take your performance and recovery to the next level with the right ingredients at the clinically effective doses contained in our Muscle Builder Tablets.

11 reviews for MUSCLE BUILDER FLEX

  1. 4 out of 5


    Stuff is pretty good, honestly a really clean pump... Thx GJ
  2. 5 out of 5


    Best NO2 Booster on the market hands down...
  3. 5 out of 5


    This product definitely increased my performance. I am on my second bottle already and will continue to order!!
  4. 4 out of 5


    Really love this product! I was able to get through my training at full capacity and tons of energy!
  5. 5 out of 5


    Very clean. Great results. Thanks Gym Junkies!
  6. 5 out of 5


    Really liking this booster. Highly recommend it!
  7. 5 out of 5


    Huge fan of this product! I recommend it to all my clients as well. Thanks GJ!
  8. 4 out of 5


    Prompt delivery, arriving before schedule. Haven't been using it a month yet...almost three weeks, but I have already begun to see a difference...I've lost weight, seeing more definition in my abdominals. No negative side effects and awesome N02 Pump!
  9. 5 out of 5


    Great product gives you energy for workouts and/or just daily health benefits
  10. 5 out of 5


    I’m able to power through my workouts like never before. Since I started using Flex, I’ve added on 3 more pounds of muscle, gotten even leaner and do notice more of a visible pump.
  11. 5 out of 5


    Flex gives you the energy of a preworkout and the pump you usually get from creatine which is awesome. I also noticed an increased in strength and endurance which allowed me to push my body to its limit. Lastly, what I liked the most about this was the fact that it made me more vascular and if you're anything like me, seeing a new vein is like seeing a newborn, you can't help but stare in awe

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