EFX Sports Karbolyn Fuel RTD is Karbolyn in a bottle: the same performance carbohydrate derived from potato, rice, and corn, pre-mixed and ready to drink. No shaker. No powder. No preparation. Open the bottle, drink it, train. Each 16oz bottle delivers approximately 50g of Karbolyn and 200 calories at zero sugar. Zero caffeine. Zero stimulants. Gluten free. Vegan. Informed-Sport certified and 100% banned-substance free. Made entirely in-house by EFX Sports. Sold in 12-bottle cases.†

Supplement Facts — EFX Sports Karbolyn Fuel RTD (Per 1 Bottle / 16 fl oz)

Calories — ~200
Total Carbohydrate — ~50g
Karbolyn (Homopolysaccharide derived from Potato, Rice, and Corn) — ~50g
Caffeine — 0mg
Sugar — 0g
Protein — 0g
Fat — 0g
Other Ingredients: Purified Water, Citric Acid, Natural Flavor, Sucralose, Potassium Sorbate, Potassium Benzoate, Sodium Benzoate, Silicon Dioxide
12 bottles per case. 16 fl oz per bottle.
Zero sugar. Zero stimulants. Gluten free. Vegan.
Informed-Sport certified — 100% banned-substance free
Manufactured in-house by EFX Sports. Triple quality tested.

When and How to Use Karbolyn Fuel RTD

Because it is stimulant-free, Karbolyn Fuel RTD can be used any time — morning, afternoon, evening, or late training sessions where caffeine would interfere with sleep. Stack it with any caffeinated pre-workout by drinking it alongside the pre-workout serving for a combined carbohydrate-plus-stimulant approach, or use it standalone as the complete pre-training fuel for athletes who do not use stimulant pre-workouts.†

Frequently Asked Questions About Karbolyn Fuel RTD

What's the difference between Karbolyn Fuel RTD and Karbolyn Energy RTD?
The only difference is caffeine. Karbolyn Fuel RTD contains zero stimulants — pure Karbolyn carbohydrate in water. Karbolyn Energy RTD contains the same 50g of Karbolyn plus 250mg of caffeine per bottle. If you are using a separate caffeinated pre-workout and want to add carbohydrates without adding more caffeine, use the Fuel RTD. If you want carbohydrates and caffeine in one bottle with no separate pre-workout, use the Energy RTD. Both are Informed-Sport certified and manufactured to the same quality standards.†
Can I stack Karbolyn Fuel RTD with Ghost Legend V4 or another pre-workout?
Yes — and this is one of the best uses for the Fuel RTD. Ghost Legend V4 provides 300mg caffeine, 6g citrulline, beta-alanine, betaine, tyrosine, and the full performance stack, but only approximately 1-2g of carbohydrates.
Is Karbolyn Fuel RTD appropriate for tested athletes in competition?
Yes — Informed-Sport certification means every batch has been independently tested for substances banned by WADA and major sports governing bodies. Informed-Sport is the same certification used by elite professional and Olympic athletes for supplement safety assurance in tested competition. The RTD format is certified to the same standard as the powder, making it appropriate for collegiate athletes under NCAA drug testing, professional athletes with league testing, and any competitive athlete who needs absolute confidence in their supplement's banned-substance status.†
Why does the RTD contain preservatives?
The dry powder format does not require preservatives — low moisture prevents microbial growth. The pre-mixed RTD contains purified water, creating an environment that requires preservation for shelf stability. Potassium Sorbate, Sodium Benzoate, and Potassium Benzoate are standard FDA-approved preservatives for RTD beverages, used at concentrations well within established safety parameters. The product is shelf-stable until opened — refrigerate after opening and consume within 24 hours.†

How to Use EFX Sports Karbolyn Fuel RTD

Drink 1 bottle (16 fl oz) approximately 15-30 minutes before exercise. Do not exceed 3 bottles per training session. Zero caffeine — appropriate any time of day. Refrigerate after opening. Gluten free. Vegan. Informed-Sport certified.†

Free shipping does not apply to this product. Liquid product exclusion applies at Get Yok'd.

Why Buy at Get Yok'd

Real-time inventory across all five Southern California stores
Available in Burbank, Glendale, Glendale Galleria, Pasadena, and North Hollywood
Authorized retailer of EFX Sports
One of the best loyalty programs in the supplement industry — earn rewards on every purchase
Owned and operated by fitness enthusiasts who actually use what we sell

Who Should Not Use Karbolyn Fuel RTD

Not for use by persons under 18 years of age without physician guidance
Do not use if you are at risk for or being treated for diabetes — contains approximately 50g of rapidly absorbed carbohydrate per bottle
Not for pregnant or nursing women without physician guidance
Individuals with corn, potato, or rice starch sensitivities or allergies should avoid this product
Refrigerate after opening and consume within 24 hours
Consult a physician before use if you have any medical condition or take any prescription medications
Keep out of reach of children

†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.