Fast hydration & virtually calorie free Improves performance Scientifically based formulation SiS GO Hydro represents a cutting edge and scientifically based formulation that 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 500ml water bottle) to ensure that all of your electrolyte and fluid requirements are met in its most simple format. SiS GO Hydro is a practical strategy to ensure hydration without the calories. You must be 18 years or older to purchase this product.