Electrolytes such as sodium and potassium help regulate fluid balance, nerve signalling and muscle function. Needs depend on food intake and fluid losses. A sports drink, a low-sugar electrolyte tablet and an oral rehydration solution can have very different compositions and should not be assumed to serve the same purpose.
Read the evidence limits and sources
Replacing meaningful sweat or illness-related losses can be important, but more electrolytes are not always better. The useful comparison is the sodium and other mineral content at the recommended dilution. Medical oral rehydration solutions are formulated for a specific purpose and are not interchangeable with every sports product.
An effervescent tablet formula with sodium, potassium, magnesium, calcium and chloride, plus vitamins C and B12. The manufacturer states less than 1 g sugar per serving.
The formula lists five electrolytes, including 115 mg sodium per scoop, plus taurine and coconut water powder. It lists 5 calories and less than 1 g sugar per serving.
The manufacturer lists 400 mg sodium and 200 mg potassium per serving, with trace minerals, vitamins and coconut fruit water powder. The formula is described as sugar-free.
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