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FLEX Muscle Builder 60 tablets

4.73 out of 5 based on 15 customer ratings
(16 customer reviews)


About the Product

  • POWERFUL NITRIC OXIDE BOOSTER – Get ready for the ultimate workout fuel that delivers electrifying energy and extreme laser-focus to every workout! This powerful nitric oxide booster has hand-picked, ultra-energizing ingredients that stimulate your mind and body to reach its maximum performance potential so that you get the most out of your workouts.
  • LIFT LONGER AND HARDER – Rapidly increases blood circulation and the flow of nutrients and oxygen into your muscles, delivering incredible endurance and strength.
  • MAXIMUM VASCULARITY – Experience blood vessel-dilating and muscle-volumizing effects for a eye-catching, bulging transformation in vascular prominence. High levels of nitric oxide are scientifically known to dilate the blood vessels, which can have a variety of positive effects on the performance and appearance of your muscles.
  • 100% MONEY-BACK GUARANTEE – We truly believe in the power of FLEX Nitric Oxide Booster and are confident that you will too. If for any reason you are unsatisfied, you can send it back for a full refund.

43 in stock


Product Description

The Bench Press

We all yearn for a dominating physique that impresses everybody. Learn how FLEX Muscle Builder can help you achieve a dominating physique!

And, we all work hard on our bodies. That’s why we should be giving it the best of everything to ensure we have the best chances of crafting the ideal physique.

Being committed to bringing out the best in your body means taking charge of your diet and supplements. You need to constantly be on the lookout for the latest in scientific discoveries. These discoveries are what bring scientifically supported muscle-building supplements to the forefront. These supplements are what allow you to make the most of your time and efforts in the gym.

GymJunkies Flex

Flex Muscle Builder Benefits

Boost Your Energy Levels

FLEX Muscle Builder is one such supplement. Its effectiveness is found in its results. This product boosts your energy to unparalleled levels, giving you that explosive burst of get-up-and-go that you need to power your way through you workouts and truly giving it all that you have.

Being low on energy during a workout can produce disastrous results. With FLEX Muscle Builder that isn’t an issue. You’ll get that boost of energy. Your entire body will be charged with power and continual energy that will last you through your day.

Boost Your Endurance

Apart from being an amazing energy builder, this product will also build up your body’s endurance levels.

What does that mean?

You’ll have the ability to enjoy longer, harder, sweatier workouts. You’ll be better able to handle heavier weights for an extended period of time. And, you’ll also be better able to engage in other activities outside the gym without having to constantly worry about the effects that it might have on your workouts.

The type of fatigue that you would usually suffer through will be a thing of the past.


FLEX Muscle Builder works to reduce your fatigue levels, instead of bolstering your energy levels.

Improve Circulation With Nitric Oxide

Muscle improvements increased energy levels, and reduced fatigue is great, but you really need more to optimize your workouts.

What else do you need?

You need improved circulation.

Improved circulation means that you can expect a better flow and pump of blood to all the part of your body. This will, in turn, relieve you of cramps and aches that often come with workouts.


Flex Muscle Builders Ingredients 

If you want to succeed, you need to give your body the scientifically proven ingredients it needs to flourish. FLEX Muscle Builder has exactly that.

  •  An ingredient that helps increase the flow of blood to the muscles. That, in turn, helps promote better circulation. It also can help to lower blood pressure. And the best quality of this ingredient is that it’s entirely natural.
  • Is the substance that is responsible behind that pumped up feeling you get after your workouts. It also increases the growth hormones in your body, thereby helping to boost the size of your muscles.
  • Is an increasingly popular supplement. Why? It is known to increase intensity levels. Creatine also promotes better muscle recovery following periods of intense workouts. If that’s not enough, it’s also been linked with better brain function!


How Does FLEX Muscle Builder Work?

FLEX Muscle Builder is composed of substances that are found in nature. All of those ingredients are what makes this product so unique. The presence of these scientifically proven ingredients provides the backbone to help ensure you have the ability for high-performance workouts.

Blood flow is increased to the muscles, thereby reducing the odds of injuries or even muscle cramps affecting you in the middle of a workout or out on the dance floor.

We all love that feeling of the amazing pump we feel after a workout. We all wish it could last longer. FLEX Muscle Builder helps that happen. Your post-workout pumps should last longer.

Growth hormones are also stimulated when consuming this product. Of course, growth hormones are responsible for increasing the size of muscles and giving them that fuller, denser look.

Apart from these highly important benefits, FLEX Muscle Builder also works hard to give you the strength and endurance increase we all crave when working out.

What does that mean?

Longer, higher quality workouts should be maintained on those heavy lifting days.

If you put the time and effort into your workouts, your body’s physique will be transformed as it’ll be loaded with incredibly high reserves of energy, while you will also be diminishing your fatigue levels substantially and improving your endurance. And, that’s because of the completely natural and safe ingredients that have been scientifically researched and verified to work.

Once you begin your journey with FLEX Muscle Builder you may have some doubts. But those doubts should soon disappear.


This product will help you achieve your muscle building goals and make your journey very rewarding.

FLEX Muscle Builder Will Fuel You

When you first started lifting weights and working on your muscles, you knew that it wouldn’t be easy. You knew it would take hard work. You also knew it would take time. FLEX Muscle Builder can help by providing you with the ultimate workout fuel. Don’t settle for regular fuel when you can get premium fuel in the form of FLEX Muscle Builder that will stimulate your body and mind to excel.

FLEX Muscle Builder increases your energy levels allowing you to go longer and far more focused. A focused trainer is more determined. And, with more determination comes greater perseverance and drive. This drive will keep you going and going throughout the day.

16 reviews for FLEX Muscle Builder 60 tablets

  1. 5 out of 5


    Best muscle builder on the market hands down!
  2. 5 out of 5


    Great energetic supplement !!! i'm 100% satisfied
  3. 5 out of 5


    As promoted, great for working out and increasing muscles gradually.
  4. 5 out of 5


    Great! I take this about 30 minutes before my workout and can tell a difference in energy level and endurance. My muscles seem to recover quicker from isometric exercises and that helps me be able to workout more often.
  5. 5 out of 5


    I have tried many Nitric Oxide boosters over the last several months. Some of them have been really good, and others have been (what I presume) nothing more than placebo pills. THESE pills have been wonderful. Just today I was working out my biceps at the gym and noticed a large vein running down my bicep. I have NEVER seen that before and not only did it look good, but I felt great as well. These pills absolutely are the real deal.
  6. 5 out of 5


    Gives you that boost you crave. also, the arginine inside here, helps with recovery, and increased levels of growth hormone at night. Its almost as effective as Viagra, for ED problems. There are obvious cardio vascular benefits as well, since your arteries become dilated. This last effect, is how you receive a better pump when you work out. Other factors produce the pump. Frequency of work out, hydration, how much glycogen is in the muscle, and intensity of your work out. So, carb up, add some supersets, drink water, and focus
  7. 4 out of 5


    This Nitric Oxide booster is one of the best I have used in a long time. Great energy boost and vascular increase. I take these about 30 minutes before working out and it really helps me bang out an intense session.
  8. 4 out of 5


    A friend recommended that I try this type of supplement to help alleviate all the soreness and to give me a boost in energy. After taking them for a few days I did notice that the soreness had decreased a lot and I was finally able to get a better workout and stay in the gym longer. For me, it was kind of a gradual effect, or maybe I just didn't really notice right away. But I'm happy that I can work out longer and more often, without needing to take off so long in between now. I never noticed any adverse negative reactions or side effects while taking these. I never felt at all jittery like I have in the past with supplements. I hate that feeling, and won't continue to use something if it makes me feel like that. Overall, I'm pleased with this product and felt as it worked as advertised. I would purchase it again.
  9. 5 out of 5


    These are one of those few products that I have tried and can actually feel a difference in my energy and strength improving and I without a doubt can notice awesome pump when I am done. I am no pro body builder and I do not go crazy in the gym. I am simply a guy that is getting close to 40 and have always used weights in my daily exercise routine. I can feel that my normal weight that I have used for years feels a little lighter so I have added 5 reps to every exercise that I am doing with the weights and I am even considering going up a few pounds. My gains muscle gains so far have been exactly what I am going for and it has helped replace some of my fat with muscle, I am not training to build extreme muscle but I am sure that these pills would be the catalyst that I could use to get over that weight hurdle and go up in weight but instead I went with more reps and have been seeing that shred and pump I am looking for. -Mike
  10. 4 out of 5


    I have tried several pre-workout NO2 products and this is a really good one. It helps you build strength and gain more energy really fast. When combined with intense workout, the results are awesome, and muscle growth will be inevitable. Just take it as the label indicates to do so, and within few days you will feel the difference. I highly recommend it; it is worth it. Loving this stuff!
  11. 5 out of 5


    My husband and I have been trying these for out workout sessions (I work out about 2-3 times a week and my husband about 4-5 times). The pills are supposed to help you enhance endurance, help build muscle, and is formulated with L-Arginine. I think the results are more visible in my husband who has been gaining muscle at a faster rate before, he is looking good!
  12. 5 out of 5


    Stellar N02 Boost. Easy and quick capsules. Increase energy and give you the extra edge and push during your workout. Increase gains, get a bigger pump and great for cardio support!
  13. 4 out of 5


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  15. 5 out of 5

    (verified owner):

    I decided to try this product when it was put on a flash sale. All I can say is wow. I feel more energy and stamina when I work out. It took me a long time to get to 95 pounds bench, even longer to cross the barrier, this product has helped me increase my strength, I just benched 105 for about 8 reps. Which is amazing. I feel like it is the boost I needed to go harder and heavier with weights.
  16. 5 out of 5

    (verified owner):

    This is my 3rd week on it and o can tell the difference on my workout. It gives me energy and endurance to lift even more than what I was lifting and I get home and I keep going, like energy last for few hours. Better than anything I had on my entire like, does not give a crush after. One thing I discovered with me. I have to take with food, something light otherwise make my stomach upset. But vitamins do the same to me, so it's just me but I wanted to share just in case you experience the same, you can prevent it. Love Flex, I will keep taking this product. Love the results

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