Science In Sport Hydro Hydration & Electrolyte 20 Tablets Berry - Special OfferScience In Sport Hydro Tabs are 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