SaltStick Fastchews is the first chewable electrolyte tablet in the marketplace! They feature a scientifically-derived proprietary high-performance formulation supplying a balanced supply of bioavailable sodium potassium magnesium and calcium. This formulation provides electrolytes to help minimize heat stress and muscle cramping due to perspiration in a quantity and form which your body can absorb. Sodium is derived from sodium citrate a proven source with the added benefit of soothing the stomach. Rapid absorption takes place by mouth. Two SaltStick Fastchews in a 15-30 minute activity equate to 100 mg sodium 30 mg potassium 10 mg calcium and 6 mg magnesium per half hour which is an ideal ratio to keep you moving. Ease of access is assured in a convenient moisture-resistant roll-wrapped format. This "Green" product generates little trash.