Dietary Supplement. Patented SubstraStim™ Technology 48 scoops / 24 serving. Super fuel substrate. Biphasic stimulant technology. Sugar & maltodextrin-free. Gluten-free. Focus +Fuel Intense training sessions require two key elements: focus and fuel. Ever try training on a low carb diet? Flat, de-motivated, and the endurance of a race car with just fumes in the tanks. Defibrillator-like doses of stimulants and amino acids alone do not provide the essential substrate that fuels intense and lasting workouts. Focus without fuel is a.