EFS-PRO High Carb

$54.95 USD

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HIGH CARB FUEL & HYDRATION MIX

The all-new EFS-PRO redefines what’s possible with high-carb fueling.  Our completely redesigned formula makes consuming more carbs per hour easier than ever while prioritizing stomach comfort.  And with a clinically effective dose of electrolytes, EFS-PRO keeps you fueled, hydrated and energized, even in the most demanding conditions.

✓ 60-120g/bottle of easy-to-digest carbohydrates
✓ Improves performance & increases energy
✓ Boosts hydration & prevents cramping
✓ No stevia, artificial flavors, sweeteners, or colors

Size
Flavor
Minus Plus
More details Right
Customer reviews

Substantial Carbs Per Hour

“EFS-PRO hits the mark when it comes to easiness on the gut.”
— Heidi Franz (DNA Pro Cyclist)

Tastes Amazing

“EFS-PRO keeps me well-fueled and tastes amazing.”
— Shayna Powless (Professional Cyclist)

Game Changer

"The new EFS-PRO formula is a game changer!"
— Adam Merry (Professional Trail Runner)
Cell Function

Muscle Contraction

Cramp Prevention

CALCIUM

Required for muscle contraction. Triggers many cellular functions during exercise. Usually not present in water, sports drinks, multivitamins or other supplements used by athletes.

Natural Sources Formed during digestion with soluble calcium ions in presence of malic acid. Small amounts are in cells throughout food sources.

Forms Dicalcium Malate Dihydroxide

Supplier Balchem® Albion® DimaCal®

Relevant Literature

Sodium Utilization

Cramp Prevention



CHLORIDE

Necessary to reap benefits of sodium. Decreases gastric intolerance from high-sodium intake.

Natural Sources N/A

Forms Evaporated Salt

Supplier Cargill

Relevant Literature

Energy Production





CITRIC ACID

Major metabolite for aerobic respiration (energy production). Enhances flavors and palatability. Regulates pH (buffering acidity). Helps other nutrients mix, taste, dissolve, and suspend better.

Natural Sources Fruits and Juices

Forms Citric Acid Anhydrous Powder (2-Hydroxypropane-1,2,3-tricarboxylic Acid)

Supplier Cargill

Relevant Literature

Energy Production

Endurance Performance & Recovery

Reduces Perceived Exertion

CYCLIC CLUSTER DEXTRIN

Increases exercise performance compared to other carbohydrates. Reduces perceived exertion. Speeds gastric emptying of glucose polymer. Improves gastric tolerability compared to other starches and sugars.

Natural Sources Common in many food stuffs. Cyclic alpha-glucans are produced during starch digestion.

Forms Alpha-(1,4)/alpha-(1/6) partially enzymatically degraded waxy maize starch (Highly-Branched Cluster Dextrins, Cluster Dextrin, HBCD, CCD, Amylodextrin)

Supplier Glico Nutrition Co., Ltd.

Relevant Literature

Energy Production

Endurance Performance & Recovery

Brain Function

GLUCOSE

Preferred, primary fuel for cellular energy production (ATP) and endurance exercise performance. Primary precursor for muscle and liver glycogen synthesis. Aids exercise recovery. Affects metabolic pathways such as insulin release and regulating fat synthesis. Crucial for brain function.

Natural Sources Non-Fiber Carbohydrates, Sucrose, Galactose

Forms Dextrose, D-Glucopyranose, Blood Sugar; Glc

Supplier Ingredion

Relevant Literature

Cramp Prevention





MAGNESIUM

Addresses common athlete deficiency. Prevents cramps. Chelate form reduces GI distress.

Natural Sources Formed During Digestion with Soluble Magnesium Ions in Presence of Malic Acid

Forms Dimagnesiumhydroxymalate

Supplier Balchem®, Albion®

Relevant Literature

Energy Production





MALATES & MALIC ACID

Major metabolite for energy production via aerobic respiration. Adds sour, tart flavor and buffers acidity. Chelates calcium and magnesium for better uptake and GI tolerability.

Natural Sources Whole Foods, Fruits and Vegetables

Forms DL-Malic Acid

Supplier Tate & Lyle

Relevant Literature

Cramp Prevention

Balances Electrolytes

Nervous System Activity

POTASSIUM

Regulates muscle contraction and nervous system activity. Addresses deficiency suffered by 95% of the US population. Balances electrolyte levels during exercise.

Natural Sources Fruits and Vegetables

Forms Dipotassium Phosphate Food Grade

Supplier Budenheim

Relevant Literature

Cramp Prevention

Heat Tolerance



SODIUM

Maintains tolerability to heat. Prevents sweat loss of sodium. Maintains plasma volume. Improves exercise recovery. Decreases urine output. Increases benefits with co-ingestion of other electrolytes. Superior source of sodium salt.

Natural Sources Salt

Forms Evaporated Salt

Supplier Cargill, United Salt Corporation, Westco

Relevant Literature

Energy Production

Endurance Performance & Recovery



SUCROSE

Provides sufficient fructose to activate GLUT5 translocation, increasing carbohydrate absorption/utilization during exercise. Less gastrointestinal intolerance than pure fructose. Aids exercise recovery. Improves flavor.

Natural Sources Table Sugar, Dates

Forms Alpha-D-Glucopyranosyl Beta-D-Fructofuranoside, Glc:Fru

Supplier The Amalgamated Sugar Company, LLC

Relevant Literature

Regulates pH

Increases Sodium Content



TRISODIUM CITRATE

Regulates pH, and has emulsifying and stabilizing properties. Increases sodium content without affecting flavor.

Natural Sources Citric Acid

Forms Sodium Citrate Dihydrate

Supplier Jungbunzlauer

Relevant Literature

No Stevia

No Artificial Flavors or colors



NATURAL FLAVORS

Naturally flavored and sweetened. Nothing artificial. Derived from a natural source of fruit.

Natural Sources Fruit.

Forms Extracts of foods, herbs and/or spices

Supplier Proprietary

Relevant Literature

THE FURTHER YOU GO, THE MORE NUTRITION MATTERS

PROFESSIONAL STRENGTH ENDURANCE FUEL, UPGRADED.

The breakthrough technology in EFS-PRO allows you to fuel with more carbs and electrolytes without wreaking havoc on your stomach.  From faster uptake to more efficient energy production, EFS-PRO’s optimal balance of high-quality carbs is proven to increase athletic performance by supplying a steadier, more efficient source of fuel than conventional carbohydrates.

EFS-PRO is designed to be mixed at higher concentrations and still be absorbed quickly.   It’s easier on overworked GI tracts, and it boosts uptake of other critical performance nutrients like electrolytes – a force multiplier you'll notice the first time you use it.

"Proper caloric and carbohydrate intake is the most important piece of the puzzle when running 100 milers.  EFS-PRO delivers an equal balance of carbs, electrolytes, and calories It goes down smooth.  The flavor is good, it’s easy on the stomach and it’s not too sweet."
Karl Meltzer

Forty-nine 100-mile wins, 73 Ultra wins

ENGINEERED FOR YOUR MOST DEMANDING DAYS

MORE FUEL IN THE TANK.

The primary carbohydrate in EFS-PRO is a special, low-glycemic, easy-to-digest Cyclic Cluster Dextrin that gets absorbed incredibly fast without making you feel lethargic, bloated, or even worse.

Cyclic Cluster Dextrin (CCD) delivers a constant and stable release of energy. In addition, CCD preserves glycogen stores and stimulates fat oxidation for energy, so you'll be able to get the most out of every stride or pedal stroke, regardless of how deep you’ve already gone.

100% PERFORMANCE

GUARANTEE

If you’re not satisfied, we don’t expect you to pay. Return it within 30 days for a refund or credit. It’s that simple.

A SMARTER WAY TO FUEL

DUAL CARB SOURCES. EVERY POSSIBLE ADVANTAGE.

In addition to the revolutionary CCD, EFS-PRO also contains the ideal ratio of high-glycemic sugars to supercharge energy production.   By gaming your biology, EFS-PRO effectively bypasses your body’s inbuilt glucose limit, sneaking more carbs into the ATP cycle by way of a fructose-only backdoor – but keeping glucose saturation high enough to erase the shortcomings of fructose alone.

Using clinical research, EFS-PRO provides more fuel that’s more easily absorbed, raising the carb count to a level that, until recently, sounded like science fiction. Now, it’s just science.

A SMARTER WAY TO FUEL

DUEL CARB SOURCES. EVERY POSSIBLE ADVANTAGE.

In addition to the revolutionary CCD, EFS-PRO also contains the ideal ratio of high-glycemic sugars to supercharge energy production.   By gaming your biology, EFS-PRO effectively bypasses your body’s inbuilt glucose limit, sneaking more carbs into the ATP cycle by way of a fructose-only backdoor – but keeping glucose saturation high enough to erase the shortcomings of fructose alone.

Using clinical research, EFS-PRO provides more fuel that’s more easily absorbed, raising the carb count to a level that, until recently, sounded like science fiction. Now, it’s just science.

We’re committed to pushing the limits of endurance performance so you can redefine your limits of endurance.

GIVE IT YOUR ALL, All THE Time

BETTER TODAY. BETTER TOMORROW.

With EFS-PRO, you'll be able to maximize every watt, every day. Our unique blend of carbs is so effective at keeping you fueled during one session, it’s already working to improve your next.

Gone are the days of limping home, junk miles, and lackluster performances. EFS-PRO preserves glycogen by keeping blood glucose high and maintaining access to fat as an exercise fuel source so you'll have fuel for more. The EFS-PRO paradox – you can push your limits today, and be ready to do it again tomorrow.

pc: @mtbpuromotor / @ernestochaconfoto / @_marcosanchezmonge

EVERYTHING YOU NEED, NOTHING YOU DON’T

YOU SPOKE, WE LISTENED.

The longer you go, the more-important your nutrition becomes. That's why we spent a year upgrading the new EFS-PRO, combining the latest research and technology with customer and athlete feedback to redefine what's possible. The Result? A myopically minimalistic formula that's streamlined for pure performance.

A DIFFERENCE YOU CAN TASTE

NO STEVIA, NO ARTIFICIAL FLAVORS, NO ARTIFICIAL COLORS.

It doesn't matter how good a formula is if it doesn't taste great. EFS-PRO is light, balanced, and refreshing – so it’s easy to stay on top of your fueling and hydration.  The carb and electrolytes in EFS-PRO are engineered for hours of intense effort in the most extreme conditions. The flavor profile is engineered to match.

We didn't stop there. We also paid particular attention to flavors and sweeteners. The new EFS-PRO is naturally flavored and sweetened and doesn’t contain any stevia.

CRAMPING & DEHYDRATION ARE HISTORY

CLINICALLY EFFECTIVE ELECTROLYTE LEVELS.

Research shows maintaining the optimal balance of electrolytes is often the difference between contesting the finish and struggling to finish – or finishing at all.

With EFS-PRO, you'll not only have more fuel in the tank, you'll also get a clinically effective dose of the essential electrolytes you need for peak performance. It’s not just sodium, it’s sodium, potassium, chloride, calcium, and magnesium – all of which are critical for preventing cramps while improving hydration.

Total electrolyte content (Na, Ca, Mg, Cl, K+) in mg
Based on 1 serving (12/23)

LEAVE YOUR COMPETITION IN THE DUST

SCALEABLE FOR ANY EFFORT 

Each scoop of EFS-PRO delivers 30g of high-quality carbohydrates. The formula is engineered for scalability without GI distress or overpowering flavor – mix the concentration from 30g to 120g CHO per bottle to increase your carb intake as required. 

RESEARCH

BIOAVAILABILITY IS THE BEST ABILITY.

Every ingredient in EFS-PRO is selected and portioned to deliver more carbs without causing GI distress. We insist on ingredients like Cyclic Cluster Dextrin (CCD) carbs, which prevent distress even at high concentration, and DiCalcium malate and DiMagnesium malate, two unique mineral sources that boost absorption rates by 20 to 100%.

EFS-PRO also includes sodium citrate, which reduces stomach acidity to further ease absorption, and citric and malic acids to encourage oxygen uptake and production of ATP (the body’s energy source), helping your cells use the fuel once it’s delivered.

PREMIUM INGREDIENTS FOR PURITY AND PURPOSE.

We prioritize purity across the rest of EFS-PRO’s ingredients list by using only the finest, most bio-available ingredients.

We also omit ingredients with no value—even the ubiquitous vitamin C, which features in virtually every other mix despite research that shows it reduces endurance when taken during exercise.

NO RESPECT FOR THE STATUS QUO.

Our approach to product design eschews unexamined ingredients, traditional processes, and trendy minimalism in favor of research-based innovation, premium ingredient sourcing, and exceeding the uncompromising expectations of elite athletes. We’re always ready to show our work and support our products with the scientific literature that informs our design choices, but we also know what virtually every athlete and publication using or reviewing our products learns firsthand: First Endurance products speak for themselves, and you can feel the difference right away.

Download Research Packet

NUTRITION FACTS


18 servings per container

Nutrition Facts

Serving size: 64g

 Amount Per Serving %DV*
Calories

240

  
Total fat

0 g

0%
Saturated Fat

0

  
Trans Fat

0

  
Cholesterol

0 g

0%
Sodium  

 380mg

17%
Total Carbohydrate

60 g

22%
Dietary Fiber

0

0%
Total Sugars
Includes 15g Added Sugar

15g

30%
Protein

0

**
Vitamin D

 0mcg

0
Calcium

 75mg

6%
Iron

 0mg

0
Potassium

  165mg

4%
Magnesium

75mg

18%
Chloride

 420mg

18%

*The %Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet.
2,000 calories a day is used for general nutrition advice.
INGREDIENTS: Cluster dextrin, sucrose, citric acid, sodium chloride, trisodium citrate, dipotassium phosphate, dimagnesium malate, dicalcium malate, natural flavors.

Q&A

Q: What's the difference between this EFS-PRO and the previous one?

A:  The main difference is that the new EFS-PRO formula makes it easy to get 60-120g carbs/bottle while being gentle on overworked digestive tracts. This article details how and why we developed it here: https://firstendurance.com/blogs/articles/coming-soon-high-carb-efs-pro 

Q:  How is EFS-PRO on sensitive stomachs?

A:  It’s designed specifically for those with sensitive stomachs. GI distress was one of our top priorities throughout the reformulation process. We used a special carbohydrate blend of Cyclic Cluster Dextrin and sucrose in order to prevent those performance-crippling stomach issues commonly experienced during longer/more demanding efforts.  

Q:  How should I use EFS-PRO?

A:  Consume one serving 30 minutes before exercise to top off electrolyte and carb levels beforehand. Use as needed during exercise.  

Q:  Is the formula Isotonic?

A:  Yes, the high carb EFS-PRO is isotonic, even at 2x strength.

Q: What size bottle should I use?

A:  While it comes down to personal preferences, we’ve found that a large bottle (750ML) is great for 1x or 2x strength.  

Q:  What’s the glucose/fructose ratio?

A:  6:1 Glc:Fru.

 Q: Is EFS-PRO gluten free?

A: Yes, EFS-PRO and EFS are both gluten free.

Q: Why did you choose that particular ratio instead of 1:1?

A:  We used a higher Glc:Fru ratio because:
-By using more CCD as the primary carb source, it's easier on the gut.
-The special CCD carbohydrate gets absorbed quicker.
-The latest research shows higher Glc:Fru ratios (like 6:1) are equivalent to 2:1 or 1:1, requiring little, if any, gut training.
-6:1 Glc:Fru ratio from Sucrose is more palatable than Glc:Fru 1:1 or 2:1.
-Fructose is 1.5X sweeter than Sucrose, and too much sweetness is a primary complaint of carb supplementation after a few hours of intense exercise- when you need carbs the most.
- Human endurance research shows that high levels of Fructose have a direct correlation to GI distress.

 Q: Do I need to take a full serving of EFS-PRO to get a benefit? 

A: No. A higher concentration increases calories and electrolytes. In other words, if you are a smaller person and normally consume a somewhat reduced amount, you will still get the same benefits.

 Q: Does EFS-PRO have any stimulants in it?

No. There are no stimulants in EFS-PRO.

 Q: Can I use EFS-PRO with caffeine?

Yes. Keep drinking tea or coffee as usual. 

 Q: What's the best way to mix EFS-PRO?

A: We've found filling a bottle half way, adding mix and shaking, and then topping the bottle off, before shaking again, works well.  

Q: Are there any artificial sweeteners, like stevia, or artificial flavors in EFS-PRO?

A:  Nope, we heard you loud and clear.  This new formula is naturally sweetened and naturally flavored.  

 Q: Why doesn’t EFS-PRO contain Vitamin C?

A: EFS-PRO doesn’t contain Vitamin C because the latest research shows that Vitamin C can have a negative effect on endurance and performance when consumed during exercise. Click here for more info.

 Q: Does EFS-PRO help me hydrate better than water?

A: We won’t name them, but there’s a growing list of competitors in the sports hydration game making the claim that their product hydrates better or faster than water alone. This is a so-what claim predicated on evidence that not only doesn’t apply to endurance athletics, but actually hampers performance during long-term endurance events. For their rationale and claims support these companies cite WHO and other medical guidelines for treating serious dehydration in disease and severe exposure conditions, not the sports nutrition guidelines for healthy athletes in endurance competitions. Also important is the need for more fuel, and these drinks fall short in the fuel department. Check out Dr. Bucci’s extended consideration of these claims here.

 Q: Is EFS-PRO safe for kids?

A: Yes. Just make sure they pay it back during their turns at the front. 

Q: EFS Pro contains sodium 380mg and chloride 420mg. Is
this effectively 800mg of salt/sodium?

A: EFS-PRO supplies sodium from both salt (sodium chloride) and trisodium citrate dihydrate (TCD). Salt is 39% Sodium and TCD is 26% Sodium. All the Chloride is from salt. This amount of sodium is equivalent to 974 mg salt. To reach increased intakes of carbs per hour and to prevent electrolyte depletion during long-term (over 4 hours), extreme conditions with maximal effort, we provide additional sodium from a non-chloride (non-salt) source - TCD in addition to salt (sodium chloride).

Q: How is the flavor? 

A: The new EFS-PRO formula went through extensive flavor testing in the most demanding conditions. With practically no sweetness this formula is ideal for those long, hot workouts where sweet drinks simply do not cut it. EFS-PRO is 100% natural flavors and contains no artificial color.

Q: Is EFS-PRO vegan friendly?
A: Yes.

Q: Is EFS-PRO gluten-free?
A: Yes.

 Q: How should I use EFS-PRO for races or training that lasts more than three hours?

A: New research suggests athletes can ingest more and more carbs per hour. For detailed information, check out this blog.

Q: When should I use EFS-PRO vs EFS?
A: We recommend using EFS-PRO when your training/racing longer than 2 hours, and/or if it's high-intensity or in extreme conditions (excess heat, high elevation, high humidity).

Q: How many servings are there per bag?
A: 18.