Electrolytes: Start with Diet and Individual Needs
The main component of table salt is sodium chloride, which provides both sodium and chloride. For healthy people with a normal diet and no unusual losses, deficiency caused solely by inadequate sodium or chloride intake is uncommon. Excessive sodium intake is more common.
The World Health Organization recommends that adults consume less than 5 grams of salt per day, equivalent to less than 2 grams of sodium. This includes salt from all foods, seasonings and drinks throughout the day, not just salt added during cooking. [1]
If the daily diet already provides enough sodium and there are no additional losses, it is worth asking: is it necessary to spend money on a high-sodium electrolyte product, such as the one shown in Figure 1?
The packaging in Figure 1 lists 800 mg of sodium, 400 mg of potassium and 60 mg of magnesium. Before use, check which serving size these amounts refer to and include them in the total daily intake.
Consider Potassium and Magnesium as Well as Sodium
The body needs to maintain a normal sodium and potassium balance. Alongside avoiding excessive sodium intake, it is important to consider whether potassium intake is adequate.
This article uses a potassium-to-sodium ratio of approximately 2:1 as an example for discussion, referring to the ratio by mass in dietary intake. For example, an intake of 2 grams of sodium would correspond to approximately 4 grams of potassium at this ratio.
This is only an illustrative calculation, not a universal standard for everyone, and it should not be used to calculate individual supplement doses. It refers to total daily dietary intake, not the amount that needs to be taken as an additional supplement.
When the daily diet already provides enough sodium, it may be useful to consider whether potassium and magnesium intake is adequate. The product shown in Figure 2 contains 1,000 mg of potassium, 120 mg of magnesium, 10 mg of sodium and 15 mg of chloride per serving. Its formulation has a different emphasis from the product in Figure 1.
However, higher potassium and magnesium content does not necessarily mean that a product is more suitable for everyone. Product choice should take account of daily diet, sweating, health status and medication use, rather than simply comparing the numbers on the label.
Who Should Be Cautious About Potassium Supplements?
For people with impaired kidney function, or those taking certain medicines that affect potassium excretion, additional potassium may increase the risk of hyperkalaemia. These individuals should consult a doctor before taking potassium supplements. [2]
The aim of electrolyte supplementation is not to choose as little sodium as possible or as much potassium and magnesium as possible, but to understand whether supplementation is needed and what needs to be replaced.
The product images illustrate differences in formulations and do not constitute product recommendations. The 2:1 ratio is an illustrative calculation, not a universal WHO recommendation.
General information only; not a substitute for medical assessment, diagnosis or treatment.