Electrolyte powder: what to look for on the label

If you are comparing electrolyte powders at all, start with the Supplement Facts panel — sodium, potassium and the serving size the manufacturer chose — plus a recognizable testing mark, not a “hydration” slogan. NIH ODS notes that most potassium supplements provide no more than 99 mg per serving, and that people with kidney disease or on certain medicines can get too much potassium even from ordinary intakes. FDA does not approve dietary supplements before they are sold. This is not medical advice, and it is not a reason to take an electrolyte product.

• Anyone looking for medical advice, a treatment for cramps or a dose. We will not provide those. A clinician should.
• People with kidney disease, or who take ACE inhibitors, angiotensin receptor blockers or potassium-sparing diuretics, unless a clinician is already involved. The ODS potassium fact sheet describes a risk of high blood potassium in those situations, including from typical food intakes and from salt substitutes.
• People who wanted a ranked list of powders. This is a label checklist, not a product review.

The ODS consumer potassium fact sheet, updated March 22, 2021, describes potassium as a mineral involved in kidney and heart function, muscle contraction and nerve transmission. It lists average daily recommended amounts by age and sex (for example, 3,400 mg for adult men and 2,600 mg for adult women) as Dietary Reference Intake figures — those are ODS numbers, not a serving size we recommend from a packet. ODS says potassium is found in fruits, vegetables, beans, dairy and meats, and that many people in the United States get less than recommended amounts from the diet. It also says most dietary supplements provide only small amounts of potassium, no more than 99 mg per serving, and that research has not shown one supplement form (chloride, citrate, phosphate, aspartate, bicarbonate or gluconate) to be better than the others.

The same fact sheet warns that salt substitutes can be a concentrated potassium source, and that people with kidney disease or on certain medications should talk with a health care provider before using them. Excess potassium from supplements or salt substitutes can cause hyperkalemia even in some healthy people if intake is high enough that the body cannot eliminate it. Those are dated ODS statements, not instructions from us.

The ODS health-professional exercise fact sheet, fetched the same day, notes that athletes in endurance activities lasting more than an hour, or performed in extreme environments, might need to replace lost fluids and electrolytes and consume additional carbohydrates. That is a general professional-sheet observation, not a product recommendation and not a personal hydration plan. The last-updated line was not visible in the extracted official text, so we do not invent a date for that sheet. The consumer companion exercise sheet we have used elsewhere is dated March 22, 2021.

FDA’s “FDA 101: Dietary Supplements” page and its questions-and-answers page both state that the agency does not approve dietary supplements for safety and effectiveness, or approve their labeling, before they are sold. Manufacturers are responsible for safety and for truthful labeling. Labels must include a Supplement Facts panel with serving size, servings per container, and the dietary ingredients and amounts per serving. Serving size is chosen by the manufacturer and does not require FDA approval, which is why two “electrolyte” packets can list very different sodium and potassium amounts per serving. If a product is marketed to treat, cure or prevent a disease, FDA treats it as a drug.

NSF Certified for Sport and USP Verified remain the same programs described on our seals page: they are not FDA approvals and not medical endorsements. NSF’s official page describes banned-substance testing plus formulation, label, facility and ongoing monitoring. USP’s official page describes labeled-ingredient amounts, specified contaminants, current Good Manufacturing Practices and dissolution or disintegration, with audits and off-the-shelf surveillance.

• The product is labeled as a dietary supplement and has a Supplement Facts panel.
• Sodium and potassium are listed in milligrams per serving, not only as a marketing percentage.
• You notice whether a serving provides a small potassium amount, consistent with ODS’s observation that many supplements provide no more than 99 mg potassium per serving — and you do not treat that figure as a target we set.
• A recognizable NSF, USP or similar current database listing is present, if you are using a testing mark as a check.
• You have a plan to talk with a clinician before using it, especially if you have kidney disease or take medicines that affect potassium.