Oral rehydration and electrolyte powders

Also known as electrolytes, electrolyte powder, ORS, oral rehydration solution, hydration powder.

Last reviewed October 9, 2026 · Jump to references

What is Oral rehydration and electrolyte powders?

In plain words

These powders contain salts, often with sugar, that dissolve in water to make a drink. The body absorbs the minerals, and sugar in oral rehydration formulas helps the gut absorb salt and water together. Researchers study these drinks for replacing fluid lost through diarrhea, sweating, or exercise. Standard oral rehydration formulas have strong evidence for dehydration from diarrhea, but not every hydration powder has the same ingredients or evidence.

Technical definition

Oral rehydration and electrolyte powders are mixtures of mineral salts, often with glucose, intended to form aqueous solutions; standardized oral rehydration salts (ORS) differ from general electrolyte blends in composition. In ORS, glucose and sodium are absorbed together through the intestinal sodium–glucose cotransporter SGLT1, promoting water absorption and replacing fluid and electrolyte losses. Regulatory classification varies by formulation and jurisdiction, with products marketed as medicines, foods, or dietary supplements.

Educational information only. This page does not provide medical advice or determine whether a supplement is appropriate for you. Review supplements with a qualified healthcare professional, especially if you take medication, are pregnant, have surgery scheduled, or have a chronic medical condition.

Important cautions

Potassium content and kidney functionhigh concern
People with reduced kidney function or taking ACE inhibitors, angiotensin receptor blockers or potassium-sparing diuretics can accumulate potassium from these products. Check the potassium content and seek clinician advice.
Electrolytes are a category, not one ingredientmoderate concern
Products grouped as electrolytes differ substantially in how much sodium, potassium, magnesium, chloride, calcium, glucose and other carbohydrate they contain. Two products with the same name on the front can deliver very different amounts, so the nutrition panel matters more than the category label.
Sodium content and blood pressure or heart failuremoderate concern
High-sodium formulas may be unsuitable for people managing blood pressure, heart failure or fluid restriction.
Oral rehydration solutions are formulated differentlymoderate concern
Medical oral rehydration solutions have defined compositions for treating dehydration, particularly in children, and are not the same as sports or flavoured electrolyte drinks.

Discuss with a clinician if any of these apply

Kidney disease
Heart-rhythm disorders

Evidence by use

Each use is rated on its own. There is no single overall effectiveness score.