Excel Sports has enjoyed a long relationship with First Endurance sports nutrition products, and as the times have changed, First Endurance has evolved their product line to reflect the most current research. EFS Energy Drink is a product that has received in-line updates, and the current formula mix is optimized for endurance athletes. EFS has long been popular with cyclists because of it's fast and efficient absorption, and because it well known to limit gastric distress while delivering exactly the proper balance of hydration and energy ingredients in the correct proportions. EFS provides everything you need to maximize endurance and performance. Their industry-leading electrolyte levels help you stay hydrated and avoid cramping. With the latest amino acid technology and ideal carbohydrate sources, EFS refuels working muscles faster than ever. Plus, updated flavor technology eliminates the formula over flavor compromise. With EFS, you can train and race with confidence knowing you don’t have to worry about gaps in your nutrition.

The company's approach to product design eschews unexamined ingredients, traditional processes, and trendy minimalism in favor of research-based innovation, premium ingredient sourcing, and the uncompromising expectations of elite athletes. Their research team always ready to show their work and support their products with the scientific literature that informs product design choices, but the team also knows what virtually every athlete and publication using or reviewing their products learns firsthand: First Endurance products speak for themselves, and you can feel the difference right away. EFS delivers a clinically effective dose of all 5 electrolytes (sodium, potassium, chloride, calcium, magnesium) in the levels shown to prevent cramping The current isotonic formula delivers complete nutrition that supports physical and mental performance, redefining the limits of endurance nutrition so you can redefine your limits of endurance. The brain plays an essential role in endurance and performance. Mental toughness and presence of mind are equally as important as fitness. You have to be able to suffer and handle stress when your body is begging you to stop. That’s why the reimagined EFS includes Suntheanine®, a patented innovation that gives you the mental toughness you need to push further and find a gear you didn’t know you had. The EFS product is an isotonic formula that supports physical and mental performance, efficient energy production, industry-leading cramp-prevention, and reduced GI distress.

Clinical research shows that a 6-8% solution delivering between 45-60g carbohydrates, >1000mg amino acids, 400-600mg sodium and equivalent balance in all electrolytes should be taken every hour during exercise. Athletes should consume one serving for every 30 minutes of intense exercise. Adjustments should be made based on body weight, training state, heat, individual sweat rates and preference. Use one serving for every 30 minutes as a starting point and adjust as necessary from there. Additional calories and electrolytes can be added with EFS Liquid Shots.

The proper balance of all required inputs are here. From the carbohydrates (osmotically balanced with your body in a 7% solution) to the electrolytes (20-100% better absorption rates), every ingredient in EFS is selected and portioned for faster and easier absorption without GI distress. The inclusion of citric and malic acids also encourages oxygen uptake and production of ATP (the body’s energy source), helping your cells use the fuel once it’s delivered. First Endurance also prioritizes purity by using only Suntheanine, the original and cleanest L-theanine, and free-form amino acids, which have a purity level of 99-100%. The company also omits 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. EFS still provides immune system support courtesy of theanine, just without impacting performance. And isn't that what this all about?