SaltStick Caps provide electrolytes to help minimize heat stress and muscle cramping due to perspiration, in a quantity and form which your body can absorb. This product is ideal for athletes, outdoor workers or for use in hot conditions. SaltStick formulated the electrolyte capsules to closely resemble the electrolyte profile lost in sweat. With sodium, potassium, calcium and magnesium, the capsules provide only what you need, with no herbal, trace or questionable components added. Plus, they're gluten, soy and nut-free, and there's no sweeteners or high fructose corn syrup. SaltStick also manufactures the capsules in an FDA-inspected facility and has their products independently tested for banned substances. Each capsule contains: 215 mg sodium, 63 mg potassium, 22 mg calcium, 11 mg magnesium, as well as 100 IU Vitamin D to help the body absorb and utilize calcium.