EFX Sports Karbolyn Fuel

EFX Sports Karbolyn Fuel

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  • Food-derived carbohydrate supplement 
  • Designed for pre-, intra-, or post-workout 
  • Certified by Informed Sport to be banned-substance free 
  • Sugar-free, gluten-free, stimulant-free, and vegan
Manufacturer: Categories: ,

Pros & Cons

What we like ...
  • 16 flavors available
  • Informed Sport-certified
  • Food-derived carb source
What needs improvement ...
  • Expensive at more than $1 per serving
  • Some customers complain that it upset their stomach
  • Very mixed reviews on taste

Product Summary

EFX Sports Karbolyn Fuel is a food-derived, fast-acting carbohydrate supplement designed for athletes looking for a fast and safe way to fuel for intense workouts and recover from them. EFX Sports recommends mixing one scoop in a shaker cup with 16 ounces of water. You can drink it 30 minutes before a workout, during a workout, or immediately after your workout for recovery.

EFX Sports claims their supplement is the perfect fuel source for athletes looking to get the most from their high-intensity training plans. They share that Karbolyn enters the bloodstream quicker than traditional sports drinks and provides fuel for workouts without causing a crash later.

Customer reviews for Karbolyn Fuel are generally positive. Customers thought the Karbolyn provided enough fuel for their higher-intensity and longer workouts. They found it mixed well and liked the wide variety of flavors available. Negative reviews complained that it tasted bad. Some reviewers shared that it gave them an upset stomach.


Carbohydrate sources

Potato, rice, or corn

Serving size

1 scoop (53 g)

Price per serving

$1.67 or $1.39

Carbs per serving

50 g

Servings per container

18 or 36


Blue razz watermelon, cherry limeade, fruit punch, grape, green apple, kiwi strawberry, lemon ice, orange, strawberry, blueberry lemonade, cherry bomb, chocolate overload, rainbow candy, raspberry lemonade, tropical storm, and neutral

GGR Community Reviews

EFX Sports Karbolyn Fuel

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      Karbolyn Fuel is an expensive option for people looking to fuel their workouts with lots of flavors. Some users did experience stomach issues with the product.