PROXIMA C / ULTRAMARATHON FUEL

The bar
has been raised.

Built specifically for ultra-runners because 5Ks, marathons, and 200-mile races are not the same. Your fuel shouldn't be either.

Shop Proxima Ultra
20 servings 120 calories / serving 250mg sodium Orange flavored
THE ULTRA
FORMULA
Proxima C Ultra orange flavored fuel container
20 servings
24.2 oz / 686 g

BUILT WITHOUT COMPROMISE

Built specifically
for ultra-runners.

Proxima C Ultra was created by endurance nutrition experts with one goal: the best ultra-running fuel possible, cost be damned.

Every ingredient, every decision was made with the unique demands of ultra-running in mind. When every mile matters, there is no substitute.

Premium
carbohydrates

Steady energy that supports fat oxidation and helps preserve glycogen.

Easy on
the gut

Engineered to minimize digestive strain so you can finish strong.

Premium
electrolytes

Top-of-the-line mineral forms for optimal absorption and balance.

Built for
mile 100

Designed for the demands of multi-hour and multi-day efforts.

NOBODY TAKES IT THIS FAR.

Every ingredient
earns its place.

Ultra-running demands more from your body. We demand more from our ingredients.

01 / 07Formula architecture

SELECTED FORMULA ELEMENTCluster Dextrin®

CARBOHYDRATE SYSTEM

Cluster Dextrin®

Fast, gentle energy selected for steady output when the effort stretches long.

FORMULA ARCHITECTURE07 deliberate choices

Albion® and TRAACS® are registered trademarks of Balchem Corporation and its subsidiaries. Palatinose™ is a trademark of BENEO-Palatinit GmbH. Cluster Dextrin® is a registered trademark of Glico Nutrition Co., Ltd.

ENDURANCE FUEL VS. ULTRA

See the difference.

More intentional ingredients. More fuel for the long haul.

FeatureProxima C Endurance FuelProxima C Ultra
Carbohydrate sourcesCluster Dextrin, Dextrose, Fructose, PalatinoseCluster Dextrin, Palatinose
Sodium sourceSodium Citrate + Sodium ChlorideSodium Citrate + Pink Himalayan Salt
Sodium per serving300 mg250 mg
PotassiumPotassium PhosphateTRAACS® Potassium Glycinate
MagnesiumDimagnesium MalateTRAACS® Magnesium Bisglycinate Chelate
CalciumDiCalcium Malate (Albion®)DiCalcium Malate (Albion®)
Ornithine50 mg85 mg
Calories per serving100120
Total calories / container2,0002,400
Servings per container2020
Price$39.99$52.99
Cost per 100 calories$2.00$2.21

PROXIMA C ULTRA / KEY DIFFERENCES

Carbohydrate sources

Ultra Cluster Dextrin + Palatinose

Endurance Fuel Cluster Dextrin + Dextrose + Fructose + Palatinose

Sodium per serving

Ultra 250 mg

Endurance Fuel 300 mg

Premium minerals

Ultra TRAACS® magnesium + potassium / Albion® calcium

Endurance Fuel Dimagnesium malate + potassium phosphate

Ornithine

Ultra 85 mg

Endurance Fuel 50 mg

Calories per serving

Ultra 120

Endurance Fuel 100

Cost per 100 calories

Ultra $2.21

Endurance Fuel $2.00

For only $0.21 more per 100 calories, you're getting our most advanced formula ever.

THE LONG GAME

Built for mile 100...
and beyond.

THE SCIENCE BEHIND

Proxima C
Ultra.

We use only the most studied, most effective, and most gut-friendly ingredients on the planet. Here's why they matter.

See the difference
01

CARBOHYDRATE DESIGN

Energy that takes you further.

Cluster Dextrin® and Palatinose™ create a slower, steadier carbohydrate profile for the long haul.

STEADY RELEASE
02

ELECTROLYTE DESIGN

Minerals chosen for the miles.

Sodium Citrate, pink Himalayan salt, TRAACS® minerals, and Albion® calcium form a premium electrolyte system.

ABSORPTION + BALANCE
03

GUT-FRIENDLY DESIGN

Built to prevent G.I. issues.

Every decision—from the carbohydrate profile to the mineral forms—was made with digestive reliability in mind.

EASY ON THE GUT
Proxima C Ultra product container

PROXIMA C ULTRA

THE ULTRA FORMULA 20 servings 24.2 oz / 686 g

Fuel for 100 miles
and beyond.

20 servings • Orange flavored

A premium ultramarathon fuel for the training days, race days, and once-in-a-lifetime efforts that ask for more.

Now taking pre-orders

Orders are expected to ship once inventory arrives, with an ETA of October 5, 2026.

Choose your purchase option
$52.99One-time purchase

Payment is collected at checkout. Subscription plans renew monthly until canceled.

VeganNon-GMONo artificial sweeteners

Proxima C Ultra trailer