Karbolyn is a clinically studied (with peer-reviewed, published research) carbohydrate supplement powder sourced from potato, rice, and corn. It’s designed for elite athletes looking for a fast, safe, and high-performance way to quickly and easily load muscles with lasting energy and for faster recovery. Carb load with Karbolyn in minutes, not hours, before your event or training session! Accept no substitutes! Absolutely nothing fuels your monster workouts like Karbolyn! It enters the bloodstream like a simple sugar, yet it still provides sustained energy without "crashing". Karbolyn is absorbed faster than dextrose, simple sugar, bread, pasta, rice, and other carbohydrate products sold in the marketplace - simple or complex. Pros worldwide use it for a reason! Do you want to Outlast, Outmuscle, and Outperform anything in your way? Then stop messing around with overhyped copycat products that would never make it past our lab. Use Karbolyn to maximize and maintain high-intensity training levels, power output, for greater muscle hardness and fullness… and pumps like you’ve never experienced before! Forget sugar-filled sports drinks that do very little to help fuel your game or workout. Karbolyn is 100% sugar-free, gluten-free, stimulant-free, and vegan-friendly. Ever use a carb powder that gels or clumps like cement? Most are shocked at how easily Karbolyn mixes and how delicious it tastes. The bottom line: Karbolyn ensures you are optimizing your glycogen stores before, during, and after training…without feeling bloated or cramping! EFX Sports is part of a very small, elite group of brands that actually make their own products. That’s why we can unquestionably guarantee Karbolyn always meets label claims and is 100% banned-substance free (certified by Informed-Sport). When you use Karbolyn by EFX Sports, you have the purest, most potent carbohydrate supplement available anywhere!

• Supports energy, performance, and endurance
• Sugar-free
• Carbonated
• STARBURST™ Starburst flavor

Explosive energy meets unexplainably juicy flavor with this C4 Performance Energy x STARBURST Candy collaboration. This zero-sugar power-up fuels next-level energy and enhanced endurance with CarnoSyn^®, BetaPower^®, and 200mg of caffeine.

STARBURST™ trademarks owned by Mars or affiliates and used under license.


Frequently Asked Questions

What is CarnoSyn?

CarnoSyn is a globally patented form of beta-alanine that is known to enhance muscular endurance.

What is BetaPower?

BetaPower is a clinically studied, natural form of betaine derived from beets that supports hydration and physical performance.

• Essential amino acid delivery
• Electrolyte support
• Supports energy, focus, and muscle recovery
• Caffeine derived from natural sources
• Juicy Strawberry flavor

Looking for the perfect pre-workout boost or anytime pick-me-up? ESSENTIAL AMIN.O. ENERGY + ELECTROLYTES by Optimum Nutrition supports muscle recovery before, during, and after exercise with 5g of micronized free-form amino acids. BONUS: it’s got 100mg of caffeine for energy and electrolytes to help replenish what’s lost with sweat.

Frequently Asked Questions

What are essential amino acids?

Essential amino acids (EAAs) are amino acids that your body can’t produce enough of on its own, including leucine, isoleucine, valine, histidine, lysine, methionine, phenylalanine, threonine, and tryptophan. EAAs support muscle growth and recovery.

What are micronized free-form amino acids?

Micronized free-form amino acids are single amino acids that are already in a pre-digested form for faster absorption by the body.