Karbolyn Fuel
EFX Sports

Karbolyn Fuel

High-Performance Carbohydrate Powder for Building Muscle*
Loads Muscle Tissue for Optimum Performance, Endurance, and Recovery*
9.5 out of 10  (163 Reviews)
2 Sizes
2.2 Lbs.
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7 Flavors
Blue Razz Watermelon
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Competitor Price: $37.39
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Our Price: $25.75 ($1.43 / Serving)
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Flavor Rating: 9.5

Product Overview



Here’s why Karbolyn® is formulated to win!™

  • Before Event: Quickly ‘Carb-Load’ In Minutes Not Hours
  • During Event: Sustain Intensity & Endurance Levels
  • After Event: Replenish Muscle Glycogen For Faster Recovery
  • Sugar-Free, Gluten-Free, Stimulant-Free
  • Mixes Instantly
  • Tested Banned-Substance Free & Pure
Each serving of Powerful Karbolyn contains: 50 grams Carbohydrates. 0 grams Sugar. Is Gluten Free. Is Stimulant Free. Is Banned Substance Free.

don't hit the wall, break through it with Karbolyn®

Have you ever experienced “hitting the wall” while training or participating in your favorite sport? When your body runs out of fuel too soon, it literally goes into ‘survival mode’, killing your performance when it counts the most. One moment you are performing at your peak, and the next minute you can hardly walk or move. It’s an athlete’s worst nightmare! Strength and performance athletes have been searching for the perfect “fuel” to help them achieve sustained optimal performance in the gym and on the field. Thanks to Karbolyn®, that search is finally over.


Karbolyn® represents the dawn of a new era of carbohydrate supplementation. Derived from potato, rice and corn, this fast-acting, long-lasting, high-performance compound offers the best of both simple and complex carbohydrates.

Simple carbohydrates have the ability to enter the bloodstream quickly. However, they can also stimulate a strong “spike” and subsequent “crash” due to a rapid rise and fall of insulin levels. This may be good for a quick burst of energy but not for sustained endurance.

Complex carbohydrates do provide sustained endurance. But, they are slow to digest, leaving you feeling bloated and lethargic.

KARBOLYN® delivers the best of both worlds

Karbolyn® is absorbed into the bloodstream like a simple sugar but without the typical crash caused when your muscles run out of fuel. It has also been shown to be absorbed as quickly as pure Dextrose (a simple carbohydrate). Yet, it still provides sustained energy without “crashing”.

don't take our word for it. what does the data say?

Karbolyn Study Data
Re: IRB No : 29443/1; KL-001
Study: July 2014–March 2015

The Clinical Study sought to document whether or not Karbolyn® has a positive and sustainable impact on blood sugar levels in normal adults during aerobic activity. A total of 24 male and female adults were randomized to receive 50 grams of either Karbolyn® or a sugar drink (dextrose). Blood was drawn before and during the two hour study, according to the protocol, and physiological responses were recorded.

Data Obtained From Participants Indicated that a simple sugar promoted a steep drop and subsequent “crash” (defined as a drop of more than 10 points or greater than 1 mg/dl of glucose per minute, or more) at a predictable point in time.

Karbolyn® gave an overall smoother decline in blood glucose level. This decline was not perceived by the volunteers as a “crash”.

This study was funded by a Grant from the Montana Board of Research and Commercialization Technology.


Other carbohydrate powders are inferior for rapid glycogen loading and nutrient absorption. They have not been accurately processed to attain rapid absorption into the bloodstream.


However, Karbolyn® uses a proprietary multi-stage “Enzymatic Milling Process” to reach optimal molecular size. This yields a superior carbohydrate for quick gastric emptying without any side-effects (such as stomach bloating or cramping) that is rapidly absorbed into the bloodstream.


Ratings & Reviews

Overall Rating
163 Ratings
Verified Buyer Rating
79 Ratings
Average Flavor Rating
7 Flavors
Top Rated Flavor
By clicking the button above, you agree to entering the Bodybuilding.com Reviews section. Products in the Store are not intended to diagnose, treat, cure, or prevent any disease.
Verified Buyer
  • 7 Neutral Flavor

I mix Karbolyn with my morning shake. Nutrabio Java Whey (1 scoop), Nutrabio Chocolate Isolate (1 scoop), and Karbolyn (1 scoop). It is a good clean carb with no sugar (unlike most carbs). Another must have in the weight lifters arsenal from EFX. The neutral flavor adds a little bit of a different taste to the protein shake, but i have gotten used to it.

Verified Buyer
  • 8 Neutral Flavor

This product did have a neutral taste. I rated this product a 6 mainly due to its poor mixability. About 90% of it would mix but always someone leaving a small lump that would taste horrible when you get to it. I will be going back to Carbion from Allmax.

Verified Buyer
  • 10 Orange

This product is great! I've used Karbolyn for over two years now. What bothers me is the fact that the packaging changes without any notice, and in many cases, small adjustments are made to the nutritional composition of the product too. Considering many of those who take it count their calories and macros and pay close attention to what they consume, I don't find that okay with regards to loyal customers- not in the health and fitness industry!

Verified Buyer
  • 9 Blue Razz Watermelon

Since MusclePharm is reformulating their Recon which was my go-to. I had to find another source and this came to mind. If you are looking for a great taste, slushy like consistency with no crash, than give this a try. I was impressed!

Verified Buyer
  • 10 Blue Razz Watermelon

I am new to carb supplements, and this was recommended to me by my sister and coach. I LOVE IT! The flavor is AMAZING, and it mixes nicely, even without a blender ball or anything, you can just shake it up in a bottle with water, and you're good. The only thing I don't love about this product is the fact that it starts to settle a bit if you don't drink it fast enough. But it's no biggie, you can just shake it back up and you're back in business!

† 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. Bodybuilding.com verifies this price every 30 days.

What's in EFX Sports Karbolyn Fuel

2.2 Lbs. Blue Razz Watermelon
Serving Size 53g (One Scoop)
Servings Per Container18
Amount Per Serving % Daily Value
Calories 200       
Calories From Fat 0       
Total Fat 0 g 0%
Saturated Fat 0 g 0%
Cholesterol 0 g 0%
Sodium 0 g 0%
Total Carbohydrates 50 g 16.7%**
Dietary Fiber 0 g 0%
Sugars 0 g
Protein 0 g 0%
Karbolyn® 50 g
(homopolysaccharide derived from potato, rice and corn)       
** Percent Daily Values are based on a 2,000 calorie diet.
† Daily Value (DV) not established
Other Ingredients:
Citric Acid, Sucralose, Natural & Artificial Blue Raspberry, Watermelon, & Vanilla Flavors, and FD&C Blue #1

Directions For Karbolyn Fuel:

Suggested Use for Individuals

As a dietary supplement, mix 1 scoop in a shaker cup with 16 oz of water and drink 30 minutes before exercise.

Usage Guidlines for Intense Training or Athletic Events

BEFORE TRAINING - Drink 1 serving 30 minutes before exercise.

DURING TRAINING - Sip on 1 serving during exercise.

AFTER TRAINING - Drink 1 serving exercise.

Warnings: Keep out of the reach of children. STORAGE: Protect from heat, light and moisture. Store at 59-86°F (15-30°C)

* 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.
Learn more about Carbohydrates.
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