It"s no myth our bodies lose minerals when we work hard. Easily lost salts, potassium, magnesium, and chromium do more than maintain proper fluid balance. They"re essential for cell function, including how vigorously muscle and heart cells "fire" and how well our bodies form hormones such as insulin. Electrolytes are important because they are what your cells (especially nerve, heart, and muscle) use to maintain voltages across their cell membranes and to carry electrical impulses (nerve impulses and muscle contractions) across themselves and to other cells. Your kidneys work to keep the electrolyte concentrations in your blood constant despite changes in your body. For example, when you exercise heavily, you lose electrolytes in your sweat, particularly sodium and potassium. These electrolytes must be replaced to keep the electrolyte concentrations of your body fluids constant. NutriBiotic Essential Electrolytes combine 100 mg of vitamin C along with electrolytes (calcium, magnesium, potassium, sodium, chloride, zinc, and chromium) for optimal performance. They are designed to be conveniently carried to the gym or site of athletic endeavor...or even the backyard after a tough day behind the mower. Sport tested for rapid recovery.