Prolonged bouts of intense exercise don’t just drain your energy; they also deplete your body’s nutritional reserves and overcome its ability to recover. Case in point: glutamine. Overtraining can cause glutamine levels to drop, impairing performance. R1 Glutamine helps keep levels elevated, without high prices. 5 grams of micronized glutamine for less than 25 cents a serving. One big stressor alleviated.