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.