Say Hello To Vanilla
Sustained Energy
"The new Vanilla is the perfect mild and sweet flavor to keep me fueled for hours"
No Stomach Drama
"Goes down easy and never upsets my gut."
Perfect Flavor
"The light vanilla flavor doesn’t get old, even after multiple servings."
“The Ferrari of sports-supplement companies.”
“First Endurance produces supplements that deliver on their promise, thanks to clinically proven dosages of endurance boosting ingredients.”
Substantial Carbs Per Hour
“EFS-PRO hits the mark when it comes to easiness on the gut.”
The Best Mix Out There
"Even at 120 grams of carbs per 24 oz, it doesn’t taste overly sweet or strong."
Game Changer
"The new EFS-PRO formula is a game changer!"
Latest Posts
Hannah Otto Digs Deep on Mauna Kea
With Hannah Otto
Hannah Otto went to the big island to chase the Mauna Kea FKT, but it almost fell apart. She talks pacing, fueling at 100g+ carbs/hour, battling a relentless headwind, and the mental shift that turned a potential disaster into the biggest margin of her FKT career.
Behind the Lens at Colombia’s Transcordilleras 2026
With Whitney Allison
"One of the most asked questions I get is whether I would go back to Transcordilleras. For the last three years, the answer has been an absolute yes. The experience, the people you meet, and the places you see change your perspective on how the world works, how people live, and what truly matters."
Micronutrients: The Quiet Performance Limiter
By Jennifer Kurtz, PhD(c), CISSN, CSCS, EP-C
The conversation around fueling usually focuses on carbohydrates, fluids, and sodium, and with good reason: they are the building blocks of endurance performance. But beneath that revolution sits a quieter layer of performance physiology that rarely gets the same attention until it's too late: micronutrients.
