One, you are building lean muscle mass from running and that weights more than fat so it will look like you are not losing weight. The other is that Glutamine is a
protein. Any
nutrient (carbs,
protein, and fats) intake that is increased and the body does not use it, it is stored in the body as fat. Suggest you start measuring your body instead of using a weight scale. You will become trimmer, clothes fitting looser, without really losing weight due to increased lean muscle mass.