SIS Hydro + Caffeine Hydration Tablets offer optimal hydration with only 9 calories per serving. These tablets are ideal for exercise, replacing key electrolytes lost through sweat. Designed to ensure effective hydration, they help you perform at your best. The effervescent tablets dissolve easily in water, providing a practical solution without added calories. Hydro meets sodium requirements at a concentration of 30mmol/L, scientifically proven to hydrate better than water alone. Originally developed for the British Sailing team at the 2008 Beijing Olympics, these tablets are perfect for hydration before and during sports. Simply drop one into a 500 ml water bottle for effective hydration.