If you play sports, you should pay attention to hydration. To keep your fluid balance balanced, drink enough fluids before, during and after sports. PowerBar L-Carnitine, low in calories, is designed to provide you with L-carnitine and refresh you when you do sports. How to use: 1 bottle a day. Shake well before use. Ideal within the hour before and during sport. As part of a varied and balanced diet and a healthy lifestyle.