MuscleXtend Review – Can This Product Boost Your Nitric Oxide Levels?

What Is MuscleXtend?

This pre-workout supplement is designed for those who want to add muscle, burn fat, feel more energized, and improve in the gym against the only opponent who matters: your past self. This supplement relies on proven scientific ingredients, unlike many workout supplements. A host of supplements, especially those sold exclusively online, rely on junk science or ingredients with little to no research behind them. Part of this is because companies know that some people are so desperate for results that they’ll blindly follow anything a manufacturer says. Smart buyers, on the other hand, will opt to go with a supplement whose ingredients have been proven time and again by high-quality studies.

MuscleXtend is a combination of three quality ingredients: two forms of L-arginine and one of citrulline. Both of these are compounds known for their ability to increase nitric oxide in the bloodstream. Nitric oxide is a molecular produced in the body that causes an increase in blood flow without an increase in blood pressure. It accomplishes this by a phenomenon known as vasodilation, or a widening of the blood vessels. This causes an increase in blood flow to the muscles, which is important for a number of reasons. It causes more oxygen to be delivered to muscles as they work, which can help you extend your workout time regardless of whether you’re doing strength training, cardio, or something else. On a long run or toward the end of a set, you likely feel the familiar burn that says you’ve about had enough. This is due to the accumulation of lactic acid in the muscle tissue, and this chemical accumulates in part to the depletion of oxygen. Since nitric oxide holds off the depletion of oxygen, and L-arginine and L-citrulline produce nitric oxide, MuscleXtend can help hold off fatigue, thus letting you extend your workout and increase their intensity.

The increased delivery of blood to the muscles also delivers nutrients and important molecules, like those in your supplements, to your muscles as they work. For example, many people use BCAAs, or branched-chain amino acids, during their workout. These are important building blocks of muscle tissue, and taking them during your workout can help you get a jump on recovery. Any time blood flow to muscles increases, so does the delivery of BCAAs and other supplements. This helps you get the most out of your supplement stack, and since many of us spend hard-earned money on supplements, it makes sense to take MuscleXtend if it means you get the most out of those supplements.

Lastly, this supplement can help you to achieve maximal growth during recovery. Because it contains two forms of the potent nitric oxide booster L-arginine, this supplement is effectively time-released. Even after your workout, you get the benefits of increased blood flow and nutrient delivery. This means your post-lift shake hits your muscles fast, right when your muscles are primed for growth. Additionally, blood-filled muscles give you an awesome muscle pump that lasts long after your workout. This makes you look more ripped and is a great confidence booster that can further motivate you to achieve your goals.



This supplement is manufactured by Kratos Supplements LLC. This manufacturer appears to only make MuscleXtend. While this my sound unusual, it is actually useful if you value a company whose employees are knowledgeable about their product. When you order from a large company that makes hundreds of products, it isn’t unusual to find that, when you call for information, an employee is unable to have all information on any given supplement on recall. By contrast, when you call Kratos with a question, the employees are only responsible for knowing about one supplement. They therefore will be able to answer your questions quickly and accurately. Additionally, with small companies, you can be assured that they have allocated maximum resources for researching and developing this single product. The result is a quality product that can help you achieve your fitness goals.


How MuscleXtend Works?

This supplement works on a few levels. It can enhance your workout performance, aid in recovery, and give you a great muscle pump. Its enhancement of workout performance is perhaps the most important feature, as MuscleXtend is sold as a pre-workout. Its capabilities are based in science, and namely on an ingredient that is supported by extensive research, namely a study that won the 1998 Nobel Prize in Medicine. L-arginine had been popular with lifters and other athletes for years prior to 1998, but nobody knew how it worked. A group of researchers found that the ingredient caused vasodilation, which then allowed for a delivery of more oxygen and more nutrients to the muscles. This also created the great pump that many users of this supplement reported.

Since L-arginine has been used for years, companies have had time to figure out optimal ways to use it, and as a result, MuscleXtend has a time-release method. This is accomplished by including two types of L-arginine: L-arginine hydrochloride and L-arginine alpha-ketoglutarate. The body breaks down different compounds at different rates. L-arginine hydrochloride is a salt that is broken down expediently, and it’s released into the blood more quickly. L-arginine alpha-ketoglutarate, on the other hand, is broken down more slowly, allowing you to experience the benefits over time.

Citrulline malate is the other ingredient included here. Though L-arginine is the original nitric oxide booster, more recent studies have suggested that citrulline may be even more effective at stimulating nitric oxide production in the body. For instance, some studies have found that, post supplementation, citrulline is converted by the kidneys into L-arginine. This results in a more efficient conversion into nitric oxide than just using L-arginine as a supplement. Multiple studies have found that supplementation with citrulline is a reliable way to increase nitric oxide in the body. Because it is converted to L-arginine and then starts to stimulate nitric oxide production, it furthers the ability of this supplement to act as a time-release nitric oxide booster. Since many pre-workouts only have one ingredient, this makes it a more powerful pre-workout supplement.

But why is it important to experience the effect over time? While it is useful as a workout enhancer, nitric oxide has positive implications for the recovery process, too. The increased delivery of oxygen and nutrients means that more of your post-workout supplementation, usually whey protein and/or BCAAs, is put to use very quickly. Because timing of your nutrition is just about as important as what you supplement with, this means that you can get the most out of these supplements, and your muscle will get the best chance to grow in size and strength. It also allows for a greater muscle pump throughout the day, and not just during and immediately after your workout. In short, this supplement works as a nitric oxide booster, but it’s unique in its ability to increase concentrations over time, not just for the period of your workout.


Ingredients of MuscleXtend

This supplement has three main ingredients, which means that it’s generally more effective than most single-ingredient pre-workouts. However, these ingredients are also very high quality. Below is a listing of these ingredients, as well as a bit of information on the efficacy of each.

L-arginine Alpha-Ketoglutarate – While half of this compound is nitric oxide booster L-arginine, the inclusion of alpha-ketoglutarate is also helpful for those who want to be able to hit peak performance. Alpha-ketoglutarate can bind to excess ammonia in the body, which builds up as a byproduct of exercise. Alpha-ketoglutarate binding to ammonia helps reduce ammonia toxicity and also may help you to reach peak athletic performance in cardio and strength training. Additionally, having this along with the hydrochloride salt of L-arginine (discussed below) means these compounds break down at different rates, thus creating a time-release effect that makes this an effective and long-lasting supplement.

L-arginine HCl – This compound also contains nitric oxide booster L-arginine, which as mentioned above is a vasodilator that improves delivery of oxygen and nutrients to muscle tissue. Its binding to HCl means it can be used by the body almost immediately. This is the first part of the time-release gradient of the supplement.

Citrulline Malate – As noted above, more recent research since the 1998 study that illuminated how L-arginine works has suggested that citrulline may be the more effective nitric oxide booster. This compound is sent to the kidneys, where it is converted to L-arginine. The body can more efficiently use this (as compared to supplemented L-arginine) so this ingredient may well be the future of nitric oxide supplementation.



There are many advantages to taking MuscleXtend as your pre-workout supplement. To start, it comes in capsules, which are easy to pack in your gym bag and take on the go. They also eliminate the need for a blender bottle. This supplement also does not contain stimulants. Some people prefer stimulants, but for others, these additives cause jitters and other issues. If you choose this supplement, you can always take an additional stimulant if you want to. Another great advantage is this supplement’s time-release capability. The many forms of nitric oxide boosters help to create a long-lasting supplement that lasts even once your workout is already done. And lastly, the manufacturer offers a trial program, so you can test out the product before buying. In an age where many have to spend considerable money before finding a supplement that works, a free trial program can be extremely helpful.



While this supplement does not have certificates, it does have some certifications that may make buyers feel reassured. It is made in the United States, which is important for many supplement buyers. It also is certified as 100 percent natural, which is comforting if you prefer to avoid artificial ingredients, and it comes with a 100 percent satisfaction guarantee, so you know you’ll get your money back if you aren’t completely satisfied. This supplement may receive certificates in the future, but the supplement market is a very saturated one, and it often takes time before a quality supplement gets the recognition it deserves.



When buying online, it’s often helpful to hear from those who have used a product. Here are some words from those who have used MuscleXtend:

– Frank, 30, Palisades, CA:

I’ve used cheapie pre-workouts for years, and I decided now was time for something better. I did my research first, though. The best part about buying MuscleXtend is that you can buy in bulk. I started with the trial, but I cancelled so I could save money by getting the five bottle deal. It’s saved money, and it really sets this company apart from the others. I’ve been using it for a few months and it really works wonders on my endurance. Will keep on using it for sure.

– John, 50, Richmond, VA:

I have a job with long hours, and after work I used to be too tired to hit the gym. But since I started using this, I’m pumped to lift! I know it has no stimulants, so maybe some of that’s placebo effect, but whatever the reason, it works. In three months, I’ve added 30 pounds to my squat and 25 to my deadlift, and I was pretty stuck before, so I consider this a major win. I’m hoping that, with time, I’ll just keep adding to these totals.

– Robbie, 44, Kansas City, MO:

I started lifting later on in life, so I’ve been a little slow on upping my weights. As most new lifter do, I added a lot of weight fast as I improved, but then I kind of hit a wall. Some guys at the gym recommended that I try MuscleXtend to help give me that extra push. And I love it! I pair it with some caffeine on my slower days when I need a little help. What I love most about it is that I feel pumped up all day, even after an early morning workout. It’s a great confidence booster as well, and I think it helps me have the courage to try new exercises, even when I’m anxious about it. All in all, it’s been truly transformative, and I’m so happy I found it.


Awards & Media Coverage

As noted above, due to the very large supplement market, it can be hard for a given supplement to get the attention and coverage it deserves. As such, MuscleXtend has yet to receive substantial media coverage or awards. However, a main ingredient was central to a study that won a Nobel Prize, so this award does help support the efficacy of the supplement. This supplement is likely one to watch for both future awards and future media coverage as it begins to get more exposure through free trials and other venues.


Money-back Guarantee

This company stands behind its products and offers a satisfaction guarantee. Returns and refunds are processed on a case by case basis. If you are unsatisfied for any reason, you may contact the manufacturer by phone or by e-mail, and they may issue you a refund if you have unused product to return. In most cases, they will likely issue a return merchant authorization, and you can then send back the product for a refund. In most cases, shipping is not refunded.



Shipping is fast and relatively inexpensive. You will generally receive your product within a few days of purchase or of initiating the trial, though the exact shipping time will vary based on the distance the bottle will be shipped. If you choose the trial option, you pay only shipping at first. For later orders, or for the buy now program, shipping costs will be rolled into the total price of the product. Tracking is not generally available. However, if it’s been awhile and you have yet to receive the product, you may want to contact the company.


Customer Support

As mentioned above, because Kratos does not manufacture more than this supplement, the employees are all very familiar with MuscleXtend, its ingredients, and how it works. They are here to help answer your questions if need be, and you can contact them by phone, by e-mail, or by regular mail. The customer service team is very prompt, and if you leave a message after hours they will get back to you quickly once business hours resume. Even if you are already a customer, you’re welcome to call to help figure out if this supplement is a good fit for you.


Safe & Secure Checkout

For many people, buying online is worrisome, particularly if you remember the days of little internet security. However, you can be assured that your information will be kept safe from those who may wish to steal it. The manufacturers of this supplement rely on the most up to date means of encryption to guard financial, address, and other information from those who might steal it. If you are concerned about the company, you can be similarly assured that the employees value your security, too, and that your info will only be used to bill you for supplements and for shipping those orders to you.


Pricing & Free Trial

Pricing for MuscleXtend is on par with that of similar supplements. However, this company offers a unique dual-option system for buying. If you are sure you want this supplement, you can use the buy now program. If you want to try it out first, you may use the free trial program. If you choose the free trial, you only pay shipping, and you get a 30-day bottle to try. If you decide it isn’t right, you may cancel within 14 days, pay no more, and keep the bottle. If you like it, do nothing, and at the end, you’ll be billed the full price of $87.43. You’ll be billed that amount each month, and you’ll have s bottle shipped to you each month until you cancel. With the buy now program, you may buy one bottle for $89.99, three for $114.99, or five for $139.99.

Allen Hicks
Allen Hicks

Allen Hicks is a professional bodybuilding coach and author. By using his experience, knowledge and understanding of all the intricacies regarding the fitness and bodybuilding industry, this websites delivers detailed reviews for every new supplement on the market. As an author, he may receive some small compensation for some of them, however we guarantee the neutrality regarding the evaluating of each of the products and the factuality of the information.

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