Precision Hydration's low-calorie electrolyte tablets come in different strengths to match how YOU sweat. Select the strength of electrolyte drink you require for your individual needs ranging from low to high sweat/sodium losses. H2Pro Tabs Designed to help you start hydrated (and stay that way once you're sweating, if you're a salty sweater). Typically used before/after intense exercise; And when sweating by athletes with very high sweat/sodium losses Enhances the absorption of water during physical exercise Hypotonic formula for faster absorption. Contains 250/500/1000 or 1500mg of sodium per litre (32oz), when mixed as directed Independently batch tested for a wide range of prohibited substances on the World Anti-Doping Agency (WADA) list Mild citrus flavour Gluten and dairy free Not genetically engineered Suitable for Vegans/Vegetarians 10 low-calorie effervescent tablets per tube View the PH hydration plan, or take their Sweat Test for your personalised recommendation. Directions for use Before intense, sweaty activity Dissolve 1 tablet into 500ml (16oz) of water and drink the night before events lasting more than ~3 hours or those taking place in hot/humid conditions. Dissolve 1 tablet into 500ml (16oz) of water and drink ~90 minutes before you start. Aim to finish your drink no less than 45 minutes before starting to allow your body to absorb the fluid properly. During intense, sweaty activity (if recommended in your Personalised Hydration Plan) Dissolve 1 tablet per 500ml (16oz) of water and drink to thirst. 1500 Electrolyte content (per 1l / 32oz, when mixed as directed) Sodium: 1,500mg Potassium: 600mg Calcium: 200mg Magnesium: 100mg 1000 Electrolyte content (per 1l / 32oz - when mixed as directed) Sodium: 1,000mg Potassium: 400mg Calcium: 100mg Magnesium: 50mg 500 Electrolyte content (per 1l / 32oz, when mixed as directed) Sodium: 500mg Potassium: 250mg Calcium: 48mg Magnesium: 24mg 250 Electrolyte content (per 1l / 32oz, when mixed as directed) Sodium: 250mg Potassium: 250mg Calcium: 6mg Magnesium: 12mg Nutritional Information Energy: 11 Kcal / 45 Kj per tablet (2.2 Kcal / 9 Kj per 100ml*) Protein: