In general, it makes sense to take this type of supplement only on days with long and intense exercise bouts. Also, electrolytes can be used several days in a row if you are running multi-stage ultra-marathons. For the average gym-goer, daily use of this supplement is useless. A possible exception would be to add a small amount of powder to plain water to improve palatability and thus force yourself to drink more fluids, especially if you live in a hot climate with high humidity.