Why Choose? Optimum hydration in a convenient format 9 calories per serving Perfect to drop into your bottle during exercise and designed replace the key electrolytes you lose through sweat. About Hydro Tablets Hydro Hydro is designed to ensure you are effectively hydrated to produce your best performance. As an effervescent tablet that readily dissolves in plain water, it represents a highly practical approach (simply drop one tablet in your 500 ml water bottle) without the calories. Hydro meets your sodium requirements at a specific concentration (30mmol/L) that is scientifically proven to produce superior hydration compared with water alone. It was developed to keep the British Sailing team optimally hydrated at the 2008 Beijing Olympics. Simply drop a tablet into water for effective hydration, with virtually no calories, before and during sports. Key Features Simply drop in water to provide a high electrolyte drink High in sodium to help promote hydration When hydration is required without the added calories Contents: 20 x 4.2g Tablets