Type the sodium, potassium and magnesium from one serving of your electrolyte powder, straight off the label. You see each as a share of the FDA’s Daily Value — with the FDA’s own words for low and high — what your servings a day come to beside the National Academies’ sodium line and the magnesium upper limit, and what a serving costs. It never tells you how many to drink.
One serving, against the Daily Value
High in sodium, low in potassium Sodium 22% · potassium 4% · magnesium 14% of the Daily Value, per serving
One serving: 500 mg of sodium is 22% of the FDA’s 2,300 mg Daily Value; 200 mg of potassium is 4% of the FDA’s 4,700 mg Daily Value; 60 mg of magnesium is 14% of the FDA’s 420 mg Daily Value. The FDA calls 5% or less low and 20% or more high.
500 mg is the sodium in about 0.22 teaspoon of table salt (the FDA: 2,300 mg is “about 1 teaspoon of table salt”).
What your servings a day come to
- 1 serving a day: 500 mg of sodium from the powder alone — 22% of the 2,300 mg a day above which the National Academies say to reduce intakes (adults 19 and over), before any food. The FDA puts the average American’s intake at about 3,400 mg a day.
- 1 serving a day: 60 mg of magnesium — not over the 350 mg upper limit NIH ODS prints for supplemental magnesium (adults 19 and over).
- 1 serving a day: 200 mg of potassium. No upper limit is set for potassium — NIH ODS: “However, in people with impaired urinary potassium excretion due to chronic kidney disease or the use of certain medications, such as angiotensin converting enzyme (ACE) inhibitors or potassium-sparing diuretics, even dietary potassium intakes below the AI can cause hyperkalemia”.
This is not medical advice and it never says how many to drink. With kidney disease, heart failure or high blood pressure, or on ACE inhibitors, ARBs, diuretics or other blood-pressure medication, ask your doctor or pharmacist before using an electrolyte product.
The FDA’s Daily Values are 2,300 mg for sodium, 4,700 mg for potassium and 420 mg for magnesium, and its rule of thumb is on every label page: “5% DV or less of a nutrient per serving is considered low. 20% DV or more of a nutrient per serving is considered high.” So a serving with 500 mg of sodium (22%) is high in sodium, and one with 200 mg of potassium (4%) is low in potassium.
How to use it
Read the “per serving” column of your powder’s Supplement Facts or Nutrition Facts panel and type the sodium, potassium and magnesium in milligrams; add the added sugars in grams if the label prints them. You see each as a share of the Daily Value with the FDA’s word for it. Type how many servings you have in a day and who drinks it, and the page shows what that comes to beside the National Academies’ sodium line and the upper limit for magnesium from supplements. Open “Cost per serving” and add the tub’s price to see what a serving costs. The page never says how many servings to have: no source it read gives your number.
The yardsticks, and whose they are
The FDA: “DVs are the recommended amounts of nutrients to consume or not to exceed each day.” and “The %DV is how much a nutrient in a single serving of an individual packaged food or dietary supplement contributes to your daily diet.” Sodium is on the “not to exceed” side — “The Daily Value for sodium is less than 2,300 milligrams (mg) per day.” — and the FDA’s advice is to choose foods “Lower in saturated fat, sodium, and added sugars.” and “Higher in dietary fiber, vitamin D, calcium, iron, and potassium.”
| On the label | Daily Value | 5% (low at or under) | 20% (high at or over) |
|---|---|---|---|
| Sodium | 2,300 mg | 115 mg | 460 mg |
| Potassium | 4,700 mg | 235 mg | 940 mg |
| Magnesium | 420 mg | 21 mg | 84 mg |
| Added sugars | 50 g | 2.5 g | 10 g |
| Sodium per serving | % of the Daily Value | The FDA’s word |
|---|---|---|
| 50 mg | 2% | Low |
| 115 mg | 5% | Low |
| 250 mg | 11% | — |
| 460 mg | 20% | High |
| 500 mg | 22% | High |
| 1,000 mg | 43% | High |
Sodium: the line that matters most
Start with sodium. The FDA’s page on it is blunt: “Americans eat on average about 3,400 mg of sodium per day.” while “the Dietary Guidelines for Americans recommends adults limit sodium intake to less than 2,300 mg per day—that’s equal to about 1 teaspoon of table salt!” The reason: “Diets higher in sodium are associated with an increased risk of developing high blood pressure, which is a major cause of stroke and heart disease.” The FDA also says what sodium is for, with one condition worth noticing: “Sodium is an essential nutrient and is needed by the body in relatively small amounts(provided that substantial sweating does not occur) to maintain a balance of body fluids and keep muscles and nerves running smoothly.”
The National Academies’ 2019 report words its sodium figure as a Chronic Disease Risk Reduction Intake — an instruction, not a target: “Adults, ≥ 19 y Reduce intakes if above 2,300 mg/day”. The line is lower for children. The FDA: “For children under age 14, recommended limits are even lower.” The National Academies’ rows, by age:
| Who | Reduce sodium if above (National Academies) | Supplemental magnesium upper limit (NIH ODS) |
|---|---|---|
| Adult | 2,300 mg a day | 350 mg a day |
| Age 14–18 | 2,300 mg a day | 350 mg a day |
| Age 9–13 | 1,800 mg a day | 350 mg a day |
| Age 4–8 | 1,500 mg a day | 110 mg a day |
| Age 1–3 | 1,200 mg a day | 65 mg a day |
The table’s own rows: “Adolescents, 14–18 y Reduce intakes if above 2,300 mg/day”, “Adolescents, 9–13 y Reduce intakes if above 1,800 mg/day”, “Children, 4–8 y Reduce intakes if above 1,500 mg/day”, “Children, 1–3 y Reduce intakes if above 1,200 mg/day”. And servings add up — the FDA: “Check the serving size and the number of servings you eat or drink to determine how much sodium you are consuming.”
Potassium and magnesium
Potassium has no upper limit — NIH’s Office of Dietary Supplements: “Therefore, the committee did not set a UL for potassium.” — but not for everyone: “However, in people with impaired urinary potassium excretion due to chronic kidney disease or the use of certain medications, such as angiotensin converting enzyme (ACE) inhibitors or potassium-sparing diuretics, even dietary potassium intakes below the AI can cause hyperkalemia”, and “Individuals at risk of hyperkalemia should consult a physician or registered dietitian about appropriate potassium intakes from all sources.” The Potassium Supplement Calculator shows why most pills stop at 99 mg.
Magnesium from a powder counts as supplemental magnesium. NIH ODS: “The Tolerable Upper Intake Level for supplemental magnesium is 350 mg for adults, and it ranges from 65 to 350 mg for children and adolescents, depending on age.” Over it, NIH ODS says: “However, high doses of magnesium from dietary supplements or medications often result in diarrhea that can be accompanied by nausea and abdominal cramping”. The label prints the elemental amount — “The Supplement Facts panel on a dietary supplement label declares the amount of elemental magnesium in the product, not the weight of the entire magnesium-containing compound.” — so type the number as printed. The Magnesium Form Finder covers the forms.
Worked examples
- 500 mg sodium, 200 mg potassium, 60 mg magnesium (the page’s example): 22%, 4% and 14% of the Daily Values — high in sodium, low in potassium.
- 1,000 mg sodium, three servings a day: 3,000 mg of sodium from the powder alone, 130% of the 2,300 mg line, before any food.
- 150 mg magnesium, three servings a day: 450 mg, over the 350 mg upper limit for supplemental magnesium.
- A $45 tub of 30 servings: $1.50 a serving — and, at 1,000 mg of sodium a serving, $1.50 per 1,000 mg of sodium.
Common mistakes
- Reading “electrolytes” as one thing. A serving can be high in sodium and low in potassium at once; the three numbers are separate lines on the label.
- Forgetting the sodium you already eat. The powder’s sodium sits on top of the average 3,400 mg a day the FDA reports.
- Counting sticks, not servings. Three servings is three times every number on the panel.
- Missing the sugar line. The FDA’s Daily Value for added sugars is 50 g; 10 g in a serving is already “high” by its 20% rule.
- Using it with a kidney or heart condition without asking. NIH ODS’s potassium sentence above is about exactly that, and the FDA ties higher-sodium diets to high blood pressure.
Frequently asked questions
What is in electrolyte powder?
The label says: its Supplement Facts or Nutrition Facts panel lists each mineral in milligrams per serving — sodium, potassium and magnesium are the three this page reads — and added sugars in grams.
Is 1,000 mg of sodium in an electrolyte packet a lot?
It is 43% of the FDA’s 2,300 mg Daily Value in one serving — “high” by the FDA’s 20% rule — and about 0.43 teaspoon of table salt’s worth of sodium. The FDA notes the body needs sodium “in relatively small amounts(provided that substantial sweating does not occur)”; with high blood pressure, ask your doctor.
How much sodium should an electrolyte powder have?
No source read for this page sets an amount for a powder. What exists is the Daily Value (less than 2,300 mg a day from everything) and the National Academies’ “reduce intakes if above 2,300 mg/day” for adults. The checker shows your label against both.
Can you have too many electrolytes?
Yes. Sodium above the 2,300 mg line is what the National Academies say to reduce; supplemental magnesium has a 350 mg upper limit for adults; and NIH ODS warns that potassium can build up in people with kidney disease or on certain blood-pressure medicines. Type your servings a day to see where yours land.
Do electrolyte packets have sugar?
Some do. The label’s “added sugars” line tells you: the FDA’s Daily Value is 50 g, so 2.5 g or less is low and 10 g or more is high.
What does a serving of electrolyte powder cost?
The tub’s price divided by its servings. A $45 tub of 30 is $1.50 a serving; the checker also shows the price per 1,000 mg of sodium.
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This is not medical advice, and nothing here diagnoses or treats anything. It reads a label against published Daily Values and limits; with kidney disease, heart failure or high blood pressure, or on blood thinners, antidepressants or blood-pressure medication, talk to your doctor or pharmacist first. Some links on this site are affiliate links: I buy what I review at full price, and a commission never changes a verdict.