Re-Built Mass XP Review – How Does This Beyond Raw Supplement Compare?

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By Leslie Waterson

Reviewed by Juliana Tamayo, MS, RDN - Last Updated

Re-Built Mass XP Review

Beyond Raw’s Re-Built Mass XP is a dietary supplement designed like a protein powder. It includes additional supplements to help athletes see noticeable gains in size, mass, and power. The formulation is densely packed; it is high protein, high carb, and high calorie.

Beyond Raw Re-built Mass XP

Re-Built Mass XP Benefits

Hyper Anabolic Formulation

Re-built Mass XP contains high amounts of branched-chain amino acids, Betaine, and protein, which are all correlated to improvements in muscle protein synthesis, which equates to increased muscle mass development when taken with resistance training.

Increased Mass Gains

This product contains 880 calories, 60 g of protein, and 120 g of carbohydrates. The high protein content and caloric density make this an easy way to get in supplemental nutrients to support muscle and weight gain when taken over time.

Improved Power

Re-built Mass XP contains a heavy dose of creatine and its precursors, to ensure your levels of creatine are always elevated. This is scientifically proven to increase your energy production and aid in your performance in the gym.

Beyond Raw Re-built Mass XP ingedients

Beyond Raw Re-Built Mass XP Ingredients (per serving)

Advanced Creatine Complex (9 g)

Micronized L-Arginine 

Arginine is an amino acid necessary for nitric oxide production in the body. It is commonly found in many foods, and is useful as a workout supplement due to increasing oxygenation of muscle cells and improving blood flow, resulting in increased endurance and recovery time. Micronized simply means the substance has been broken down into very fine particles, making it easier for the body to absorb.


Creatine is a chemical naturally found in your muscle fibers, and works by increasing the amount of ATP your body generates. This increases the amount of usable energy during workouts, thus improving performance in the gym. Creatine has been thoroughly studied, and its effectiveness for athletes has been well established, making it one of the most widely used workout supplements.

Micronized Glycine 

Glycine is an amino acid that is found in the body in various structures within the body. Glycine is often supplemented due to its role in improving insulin sensitivity and the central nervous system.Glycine is also a component of creatine, and taking supplemental glycine helps to elevate levels of creatine in the blood.

Micronized Guanidinoacetate 

Guanidinoacetate is a precursor to Creatine, made from glycine and arginine. Taking supplemental guanidinoacetate has been shown to convert into creatine in the blood, thus increasing creatine levels.

Micronized L- Methionine

Methionine is an amino acid that is critical in helping to create proteins in the body. It plays an important role in building muscle and repairing damage incurred after exercise. Methionine is also a methylator in the body, which impacts DNA expression over time.

Hyper Anabolic Complex (19.3 g)

Calcium HMB 

HMB is short for Beta- hydroxy Beta- Methylbutyrate, which is a metabolite of Leucine- An amino acid primarily responsible for activating muscle protein synthesis  after physical activity. HMB is regarded as an anti-catabolic supplement, and has been shown to be effective at slowing the rate of muscle protein breakdown. It’s important to note that HMB alone is not effective at activating muscle protein synthesis.

Digestive Enzyme 

Digestive enzymes found in supplements are intended to assist the body with digesting the contents of this formula. Since this product contains a large amount of protein per serving, it can be difficult for the body to properly digest it all. This formulation contains aminopeptidases and proteases, which are enzymes responsible for breaking down proteins. This will aid in the proper digestion of proteins and reduce potential side effects associated with the intake of large quantities of protein.

Betaine Anhydrous 

Betaine anhydrous is a naturally occurring chemical found in the body which is responsible for reducing levels of homocysteine, a marker of inflammation. Taking supplemental betaine has been shown to improve body composition, increase power and strength in trained athletes. While betaine has not been thoroughly researched as an ergogenic aid, it has been shown to be far more effective than a placebo in human research and may increase levels of nitric oxide and crucial anabolic substances in the body, which can improve muscle development.


BCAAs, also known as Branched-chain amino acids, are simply the 3 amino acids primarily responsible for muscle protein synthesis – Leucine, Isoleucine, and Valine. BCAAs have been thoroughly studied, and have been shown to be effective at triggering muscle protein synthesis in athletes. They help to maintain adequate levels of amino acids in the blood during exercise, which reduces fatigue.

Does Re-Built Mass XP Work? 

The formulation of this product is absolutely sufficient to aid in muscle building and mass gaining. It is calorically dense, has adequate protein for muscle synthesis , and enough carbohydrates to effectively refuel glycogen stores for your next workout.  This product is fairly straightforward – It is high calorie and high protein, so you will definitely mass up when taking this product. The protein content is significant enough to encourage muscle protein synthesis, which will result in more muscle mass development over time. However, this product is intended to supplement a diet that is already conducive to growth and should be taken when following some sort of exercise regimen.

Re-Built Mass XP 2 Pack

Who Is Re-Built Mass XP Best For? 

This product is intended for use by athletes who are interested in increasing their lean muscle mass, such as athletes who follow a resistance training or bodybuilding program. It should only be used in conjunction with an exercise program.

Beyond Raw Re-built Mass XP for athletes

Is Beyond Raw Re-Built Mass XP Safe?

Only take Re-Built Mass XP as intended. Not for use for individuals under 18 years of age, or those with underlying health conditions.

High Protein concerns

Due to the high protein content of this product, it may cause GI upset in some people. People with some health conditions, such as kidney dysfunction, should consult with their doctor prior to supplementing protein.

High Creatine Content

This product is high in creatine. Creatine does not have any significant safety concerns, but it does increase water retention in muscle cells.  You may see a rapid increase in weight after starting Re-built Mass XP, which is a normal side effect of creatine supplementation.

How To take Re-Built Mass XP?

The serving size of this Re-Built Mass XP is 3 scoops. Mix scoops with 16 oz of water or other drink of choice; You can also mix in a blender. It is recommended to only take 1 serving daily, and drink adequate amounts of water when taking this product.

Beyond Raw Re-built Mass XP powder

Where To Buy Re-Built Mass XP

Beyond Raw’s Rebuilt Mass XP is sold through Amazon or on the GNC website. On the GNC website, this product is available in 5 flavors – chocolate, vanilla, cookies & cream, peanut butter, and strawberry. One 6lb container costs $64.99 and has 11 servings, which comes out to $5.90 per serving. Additionally, GNC does offer 10% off and free shipping if you sign up for their auto-delivery subscription program.

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Re-Built Mass XP is definitely on the more expensive side of the spectrum when compared to similar products. The steep pricing is almost justifiable if you consider each serving as a meal replacement. So, if you can stomach the price, it just may be worth the try!

Overall Rating:
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Leslie Waterson

Leslie has been passionately involved in the health and fitness industries for over a decade. She is constantly reviewing the latest scientific research and studies in order to take a research-backed approach to lifestyle optimization. Her main areas of interest include nutrition and supplementation. Leslie shares her findings on Fitness Clone to help other health enthusiasts choose the products and routines that will help them achieve their goals.