What do rehydration powders do? The science of rapid hydration
                                
                                
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                                    5 min read                                
                            
                                The World Health Organization (WHO) developed oral rehydration salts (ORS), a form of rehydration powders, to combat dehydration and has credited them with preventing millions of deaths globally. So, what do rehydration powders do, and why are they significantly more effective than plain water for replenishing fluids quickly?