All the Integrity formulas (except Integrity Rice Bran which is a fat supplement) are balanced formulas. They are balanced for the dietary required nutrients that includes Na, K & Cl, the primary electrolytes, as well as Ca & Mg. If you are working your horse at moderate to heavy/very heavy intensity levels, then an electrolyte supplement may be useful. Humid, high temperatures also add to the need. I do not recommend daily electrolyte supplementation; Na, K & Cl follow water which translates. If fluid balance/pH is not a challenge, then the added electrolytes are eliminated via urine. The general recommendation is 2 hours prior to exercise and 2 hours after exercise. If in an endurance competition, then electrolyte supplement should also be included every 2 hours during exercise.