USN® |Cramp Block TabletsUSN's Cramp Block Tablets: The ultimate cramp fighting, electrolyte rich supplement for extended training. With essential minerals and electrolytes, it keeps you at peak performance. Say goodbye to muscle fatigue and hello to rehydrated muscles after intense physical activity. Increases stamina Replenishes electrolytes Reduces muscle cramps Sodium bicarbonate: can enhance endurance and speed. Reduces acidity in the muscle during extreme endurance