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Electrolyte powders
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In one pass Of everything sweat carries out of the body, only one thing really matters: salt, or more precisely the sodium in salt.
Educational content, not medical advice — consult a clinician.
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Chapter 1
What's actually in sweat
Of everything sweat carries out of the body, only one thing really matters: salt, or more precisely the sodium in salt. Potassium, calcium and magnesium leave in sweat too, but in amounts small enough to ignore. So when you decide whether to replace electrolytes, look at one thing first: how much sodium this bout of sweating cost you, and how much your meals and drinks put back.
In easy-to-remember terms: an hour of heavy sweating (about 1 L of sweat) loses roughly 900 mg of sodium, the amount in 2.3 g of salt. It also takes about 200 mg of potassium, 5 mg of magnesium and 40 mg of calcium, and those last few are too small to worry about.
How salty sweat is varies from person to person. Someone whose clothes show white salt marks and whose skin tastes salty after training can lose several times as much sodium in the same hour of exercise as someone who leaves almost no marks. Genes and heat acclimation decide it together: after ten days or so of training in the heat, the body learns to hold on to salt and sweat becomes less salty.
The danger in the other direction matters more. If you keep drinking large amounts of water during long exercise, the sodium in your blood gets diluted. A headache, nausea or confusion during or after exercise, when you have been drinking all along, may be low blood sodium from drinking too much, called exercise-associated hyponatremia (EAH): stop drinking water and get medical care immediately.
In easy-to-remember terms: an hour of heavy sweating (about 1 L of sweat) loses roughly 900 mg of sodium, the amount in 2.3 g of salt. It also takes about 200 mg of potassium, 5 mg of magnesium and 40 mg of calcium, and those last few are too small to worry about.
How salty sweat is varies from person to person. Someone whose clothes show white salt marks and whose skin tastes salty after training can lose several times as much sodium in the same hour of exercise as someone who leaves almost no marks. Genes and heat acclimation decide it together: after ten days or so of training in the heat, the body learns to hold on to salt and sweat becomes less salty.
The danger in the other direction matters more. If you keep drinking large amounts of water during long exercise, the sodium in your blood gets diluted. A headache, nausea or confusion during or after exercise, when you have been drinking all along, may be low blood sodium from drinking too much, called exercise-associated hyponatremia (EAH): stop drinking water and get medical care immediately.
Numbers · How salty your sweat is, and how to test
The sodium concentration of your sweat can be estimated in several ways.First, the rough electrolyte make-up of sweat (in mmol/L, approximate ranges):
| Ion | Median | Range |
|---|---|---|
| Na⁺ (sodium) | about 40 | 20–80 (90+ in very salty sweaters) |
| K⁺ (potassium) | about 5 | 3–10 |
| Cl⁻ (chloride) | about 40 | 20–80 |
| Ca²⁺ (calcium) | about 1 | 0.5–2 |
| Mg²⁺ (magnesium) | about 0.2 | 0.1–0.4 |
1. Clinical laboratories:
A sweat collection test (the Macroduct sweat conductivity test): used in medicine to screen for cystic fibrosis (an inherited disease that makes sweat unusually salty), and also in sports science.Sweating is triggered on the forearm, the sweat is collected, and its electrical conductivity is measured and converted into a sodium concentration.Professional sports-science labs can do it.
2. Commercial services:
Companies such as Precision Hydration and Levelen sell home test kits.About $50–150, with the sample mailed back to a lab.
3. Estimating by eye (the most practical):
Obvious white salt marks on your clothes after training: high sweat sodium (> 60 mmol/L)Skin that clearly tastes salty: medium to highHardly any salt marks and no salty taste: low to medium
4. Estimating sweat rate from body weight and fluid:
Weigh yourself without clothes before and after training, and note how much you drank during that 1 hour.(Weight before − weight after + fluid drunk) ÷ time = sweat rate (L/h)Then use the medians in the table for a rough estimate of the sodium lost.
In practice:
Most recreational exercisers do not need formal testing; the median estimates are enough.Endurance or high-level athletes (training > 2 h, marathons, triathlons): one test is worthwhile, because the right fluid plan differs a lot from person to person.Repeated cramps at night together with visibly salty sweat: a sign that a deliberate sodium plan may help (though not necessarily a supplement; more salt in your food often works).
Two common mistakes:
More sweat means more sodium lost is wrong: how much sodium you lose depends on the sodium concentration of your sweat, not just on the volume.Magnesium is the key electrolyte is wrong: very little magnesium is lost in sweat (< 5 mg/L), so it almost never needs replacing.
Chapter 2
Comparing electrolyte products
Electrolyte products come in four kinds, but one piece of chemistry behind them is all you need first: water alone is not enough; sugar and salt have to arrive together before water can be pulled into the blood.
On the side of small-intestine cells that faces the gut sits a transporter called sodium-glucose cotransporter 1 (SGLT1). It is a gate that only accepts tickets for two: glucose and sodium must arrive together, and then it carries both into the cell. Once inside, the sodium is pumped out to the blood side, which sets up a small concentration difference across the gut wall, and water follows that osmotic gradient into the blood. So during diarrhea, pouring in plain water leaves nothing to pull it across; it goes round and comes straight back out. When sugar and salt come as a pair, the water really gets in.
Oral rehydration salts (ORS) are the version with this ratio tuned exactly right. They cost almost nothing, and of the four kinds they are the only one that has truly saved lives. Sports drinks are a diluted version; premium hydration powders are a saltier, pricier version; coconut water gets it backwards, with a lot of potassium and little sodium, the reverse of sweat. Blurring the differences between these four is marketing's favorite move.
On the side of small-intestine cells that faces the gut sits a transporter called sodium-glucose cotransporter 1 (SGLT1). It is a gate that only accepts tickets for two: glucose and sodium must arrive together, and then it carries both into the cell. Once inside, the sodium is pumped out to the blood side, which sets up a small concentration difference across the gut wall, and water follows that osmotic gradient into the blood. So during diarrhea, pouring in plain water leaves nothing to pull it across; it goes round and comes straight back out. When sugar and salt come as a pair, the water really gets in.
Oral rehydration salts (ORS) are the version with this ratio tuned exactly right. They cost almost nothing, and of the four kinds they are the only one that has truly saved lives. Sports drinks are a diluted version; premium hydration powders are a saltier, pricier version; coconut water gets it backwards, with a lot of potassium and little sodium, the reverse of sweat. Blurring the differences between these four is marketing's favorite move.
Numbers · Sodium, sugar and price in four products
Look at the four kinds one by one, and do not let marketing blur them together.1. Sports drinks (Gatorade, Powerade, Pocari Sweat)
Sodium: 400–500 mg/L (18–22 mmol/L), far below sweat, designed for moderate replacement during long exerciseSugar: about 60 g/L (6% glucose), which uses the sodium-glucose cotransporter (SGLT1) to aid absorption and also fuels the exercisePotassium: 100–200 mg/LPrice: cheapReal use: 60–120 minutes of moderate exercise, replacing as you sweat
2. Premium sports products (LMNT, Liquid IV, Precision Hydration, Maurten)
Sodium: 1000–2000 mg/L (45–90 mmol/L), close to or above the concentration in sweatSugar: from 0 g (LMNT) to 16–24 g (Liquid IV)Price: expensive ($1–3 a packet)Real use: salty sweaters, long sessions and heavy sweating (endurance training, hot conditions, triathlon)Ordinary office workers have no use for this dose at all.
3. Oral rehydration salts (ORS, the WHO formula)
Sodium: per liter, 2.6 g sodium chloride + 1.5 g potassium chloride + 2.9 g sodium citrate, giving 75 mmol of sodium and 20 mmol of potassiumSugar: 13.5 g of glucose per liter (a precise ratio that uses SGLT1 to actively pull water and sodium from the gut into the blood)Osmolality: about 245 mOsm/L (hypotonic), so it does not draw water back into the gutPrice: extremely cheap (about $0.10/L)Real use: dehydration from acute diarrhea and vomiting. This is a landmark of global public health that has saved tens of millions of children.It is not a sports drink: its osmolality is designed to move water from the gut into the blood, for genuine recovery from dehydration.
4. Coconut water (sold as a natural electrolyte drink)
Sodium: about 250 mg/L, far below sweatPotassium: 2000–2500 mg/L; high potassium and low sodium, the reverse of the ratio in sweatSugar: about 50–60 g/L (natural sugars)Real use: a little sugar and potassium after exercise, but it cannot replace sodium, which is coconut water's biggest mismatch
Comparison table:
| Product | Sodium (mg/L) | Sugar (g/L) | Real use | Value for money |
|---|---|---|---|---|
| Gatorade | 450 | 60 | 1–2 h of exercise | Medium |
| LMNT | 2000 | 0 | Heavy sweating, low-carb diets | Low |
| Liquid IV | 1000 | 22 | Like ORS but 30× the price | Very low |
| WHO ORS | 1750 | 13.5 | Dehydration from diarrhea | Extremely high |
| Coconut water | 250 | 55 | Potassium and sugar (not sodium) | Medium |
| Salt + water + sugar | Your mix | Your mix | Most situations | Extremely high |
In practice: for most people, a pinch of salt and a spoonful of sugar in water is a homemade sports drink, at $0.05/L against $3/L for LMNT.
Mechanism · Why oral rehydration salts save lives
Oral rehydration salts (ORS) are one of the 20th-century medical inventions that did most to cut deaths, and a textbook example of a simple mechanism with a huge global impact.Historical background:
Before the 1960s, acute diarrhea was the leading cause of child death worldwide (about 5 million a year).The only treatment then was intravenous fluid: expensive, dependent on a cold chain and doctors, and simply unavailable in villages and refugee camps.Around 1968, clinical studies in Bangladesh (Dhaka) and India (Calcutta) showed that oral glucose-salt solution lets the gut of a cholera patient absorb water again.In the refugee camps of the 1971 Bangladesh Liberation War, when intravenous fluids ran short, Dr Mahalanabis switched to oral rehydration on a large scale, and cholera deaths fell from about 30% to about 3%.In 1978, WHO and the United Nations Children's Fund (UNICEF) made it a core child-health intervention.
The mechanism (why it works):
Acute diarrhea (cholera, rotavirus, E. coli) makes the gut secrete too much fluid, and sodium, water and potassium are lost in large amounts.Plain water is not enough, because the gut needs sodium and glucose to absorb water.Sodium-glucose cotransporter 1 (SGLT1) sits on the membrane of gut cells that faces the gut; each time it carries 1 glucose and 2 sodium into the cell, and water follows the osmotic gradient in.The ORS formula exploits SGLT1: glucose and sodium are matched in a precise ratio, so water is still absorbed even while the gut keeps secreting.Sugar, salt and water in the right ratio is exactly what ORS is.
A 1978 commentary in *The Lancet* said: "ORS is potentially the most important medical advance of this century."
The modern ORS formula (WHO 2002 revision):
Sodium chloride: 2.6 g/LPotassium chloride: 1.5 g/LSodium citrate: 2.9 g/LGlucose: 13.5 g/LOsmolality: 245 mOsm/L (hypotonic, better than the old 311 mOsm version)
Home emergency recipe (UNICEF's emergency version):
1 L of clean water + 6 level teaspoons of sugar + 1/2 teaspoon of saltImperfect (no potassium, no citrate), but it can save a life in an emergency.
Global impact:
From 1980 to today, child deaths from diarrhea fell from about 4.6 million a year to about 0.5 million (roughly a 90% drop).ORS is the largest single intervention behind that fall.A packet (made up to 1 L) costs about $0.10; measured by the cost of each life-year saved, it is one of the cheapest interventions in the history of medicine.
So when some brands repackage the ORS formula as premium hydration and sell it for $3 a packet, remember that the same thing has saved tens of millions of children: that is the distance between marketing and a real medical contribution.
Chapter 3
Who actually needs them
The situations that truly call for an electrolyte supplement are much narrower than the ads suggest. There is only one test: you are losing sodium by the gram right now, and your meals cannot make it up.
Only three kinds of situation pass that test. First, acute diarrhea or vomiting: the gut is pouring fluid out, sodium leaves with the water, and this is home ground for oral rehydration salts, the use that guidelines worldwide agree on. Second, more than about an hour of heavy-sweat exercise or work in the heat, where sweat keeps carrying sodium away. Third, the first few weeks of a ketogenic or low-carb diet: as insulin falls, the kidneys stop working so hard to reclaim sodium, more sodium leaves in the urine, and headache and fatigue follow. The so-called keto flu mostly comes from this, not from some mysterious adaptation reaction.
The rest of the selling points, from daily hydration to hangover cures, brain fog and a morning pick-me-up packet, have no sodium-loss mechanism underneath them. Remember the risk in the opposite direction too: drinking too much water during long exercise dilutes the sodium in your blood, which is more dangerous than replacing a little too little sodium.
Only three kinds of situation pass that test. First, acute diarrhea or vomiting: the gut is pouring fluid out, sodium leaves with the water, and this is home ground for oral rehydration salts, the use that guidelines worldwide agree on. Second, more than about an hour of heavy-sweat exercise or work in the heat, where sweat keeps carrying sodium away. Third, the first few weeks of a ketogenic or low-carb diet: as insulin falls, the kidneys stop working so hard to reclaim sodium, more sodium leaves in the urine, and headache and fatigue follow. The so-called keto flu mostly comes from this, not from some mysterious adaptation reaction.
The rest of the selling points, from daily hydration to hangover cures, brain fog and a morning pick-me-up packet, have no sodium-loss mechanism underneath them. Remember the risk in the opposite direction too: drinking too much water during long exercise dilutes the sodium in your blood, which is more dangerous than replacing a little too little sodium.
Clinical · Criteria for six real uses
The situations that genuinely call for an electrolyte supplement are narrower than people think, and most people living city lives need almost none of them.Strong indications (backed by evidence):
1. Acute fluid loss from the gut
Acute diarrhea with vomiting: oral rehydration salts at the prescribed dose (10 ml/kg after each loose stool)This is the global consensus of WHO, UNICEF and the American Academy of Pediatrics (AAP).
2. Long, hard exercise (> 60–90 min, heavy sweating)
Marathons, triathlons, long-distance cycling, team-sport training longer than 2 hoursThe American College of Sports Medicine (ACSM) consensus: for exercise longer than 1 h, consider a sports drink with 300–700 mg of sodium per liter.Ultra-endurance events of > 3 h: extra sodium (500–1000 mg/h) is often suggested, but extra sodium cannot offset the low blood sodium caused by drinking too much; the key to prevention is not overdrinking.
3. Work or training in the heat
Outdoor construction, firefighting, military training, hot yoga: sodium losses in sweat are magnified.Heat acclimation plus enough sodium in the diet, with electrolyte drinks when needed.
4. High sweat sodium (genes plus heavy training)
People with obvious salt marks on their clothes and frequent cramps may, in individual cases, need drinks with 1000–2000 mg of sodium per liter.
5. The transition to a low-carb or ketogenic diet (1–3 weeks)
When insulin falls, the kidneys excrete more sodium, bringing the headache and fatigue of keto flu.A common approach is a temporary extra 2–3 g of sodium plus 1–2 g of potassium a day to ease it.
6. Medicines that cause long-term low sodium
Diuretics (hydrochlorothiazide, spironolactone), and selective serotonin reuptake inhibitor () antidepressants in older adultsThis needs a doctor's guidance; it is not a case for buying an over-the-counter supplement.
Weak or no indication (these do not survive the evidence):
Daily hydration: an ordinary office job and a moderate diet already supply 3–4 g of sodium a day from food, far more than needed.Hangover cure: a hangover involves some dehydration, but it is not only dehydration; low blood sugar and alcohol metabolism play a part too. A drink similar to oral rehydration salts helps a little, but plain water with food works about as well.Mental fatigue, drowsiness at work: there is no sodium-deficiency mechanism behind them.Anti-aging, general wellness against electrolyte imbalance: no evidence.A morning glass of electrolytes: marketing, not medicine.
Red flag · Low sodium from drinking too much
Exercise-associated hyponatremia (EAH), low blood sodium linked to exercise, is one of the most dangerous metabolic emergencies in endurance sport, and, ironically, it is caused by drinking too much water.The mechanism:
During long exercise, you drink more plain water or low-sodium sports drink than you lose in sweat, while sweat keeps carrying sodium away, so the blood is diluted and blood sodium falls to 135 mmol/L or below.Antidiuretic hormone (ADH, the hormone that makes the kidneys hold on to water) rises when it should not: exercise stress and nausea, stimuli unrelated to blood concentration, both trigger its release, so the extra water you drank cannot be passed.In severe cases, with blood sodium < 125 mmol/L, water moves into brain cells and causes brain swelling, with headache, nausea and seizures, and it can kill.
The classic study:
Almond 2005 (NEJM), the 2002 Boston Marathon (n=488, blood drawn at the finish):13% of finishers had low blood sodium (≤ 135 mmol/L).0.6% had critically low sodium (≤ 120 mmol/L).After adjusting for other factors, low sodium was linked to weight gain during the race (in other words, drinking too much), a finishing time over 4 hours, and a body mass index that was very high or very low.Women looked more at risk only in the unadjusted analysis, and the difference disappeared after adjustment; whether runners drank sports drinks or plain water made no difference either.The study is often seen as a turning point in marathon hydration advice, toward do not overdrink.There have been several deaths: from the 1990s to the 2000s, people died of EAH in US military training, trail races and triathlons.
How it presents:
It looks like dehydration: dizziness, nausea and headache get mistaken for heatstroke or dehydration, the person drinks even more water, and things get worse. That is the heart of the tragedy.What really tells them apart: body weight has not fallen or has even risen (dehydration makes weight fall), plus a blood sodium test.
If persistent headache, nausea and vomiting, confusion or seizures come on during or after exercise, especially when you have been drinking all along and your weight has gone up rather than down: stop drinking water and get medical care immediately.
Prevention:
Drink when you are thirsty; do not force yourself to drink on a schedule.Do not drink faster than you sweat: gaining weight during a race is the sign that you drank too much.For exercise longer than 90 minutes you can use sodium-containing sports drinks or salty food, but they cannot offset overdrinking: the sodium concentration of a sports drink (about 18–22 mmol/L) is far below that of blood.Slow finishers and people who are very lean or heavy need to be even more restrained about how much they drink.Practices like drinking 1 L of water before the start are wrong.
So what most needs promoting at marathons is not a premium product like LMNT but the idea of not overdrinking: drink to thirst; losing a little weight during a race is normal, and gaining weight means you drank too much.
Chapter 4
Do you need it every day?
Daily electrolyte powder is one of the most successful marketing inventions of recent years: it took a need that exists only in particular situations and sold it as a lifestyle packet for every morning.
Its core claim is that you are always mildly dehydrated and out of electrolyte balance. But ordinary food is already salty; one takeout meal can use up a whole day's sodium allowance, and adding a packet of salt powder pushes in the wrong direction. What really leaves you tired and foggy is usually too little sleep, skipped meals and too much sitting. None of these has a sodium-shortage pathway in the body to explain it, so adding sodium does not fix them.
Sodium is not more-is-better either: a high intake over years pushes blood pressure up, and blood pressure is the sturdiest link in the chain of heart and stroke risk. People with high blood pressure, chronic heart failure or chronic kidney disease in particular should not add more.
The central irony: city office workers eat salty takeout and then buy expensive salt powders to optimize hydration, when chemically what they need is less sodium, not more.
Its core claim is that you are always mildly dehydrated and out of electrolyte balance. But ordinary food is already salty; one takeout meal can use up a whole day's sodium allowance, and adding a packet of salt powder pushes in the wrong direction. What really leaves you tired and foggy is usually too little sleep, skipped meals and too much sitting. None of these has a sodium-shortage pathway in the body to explain it, so adding sodium does not fix them.
Sodium is not more-is-better either: a high intake over years pushes blood pressure up, and blood pressure is the sturdiest link in the chain of heart and stroke risk. People with high blood pressure, chronic heart failure or chronic kidney disease in particular should not add more.
The central irony: city office workers eat salty takeout and then buy expensive salt powders to optimize hydration, when chemically what they need is less sodium, not more.
Myth · The slogans against the numbers
Why is daily electrolyte powder the hottest marketing trap of the 2020s? Let us check the evidence claim by claim.It is one of the fastest-growing supplement categories of recent years: new brands carry high valuations, and some have been bought by large consumer-goods companies.
Marketing claims and reality:
99% of Americans are dehydrated: there is no such figure, and the US Centers for Disease Control and Prevention's national nutrition survey (NHANES) does not support the claim.Electrolyte imbalance causes fatigue and brain fog: ordinary food supplies plenty of sodium, potassium and magnesium, and brain fog is almost never an electrolyte problem.Hydrates better than water: water is water; sodium and sugar speed up absorption only in particular situations (exercise, diarrhea).Essential for keto and intermittent fasting: useful only during the transition (1–3 weeks), and not needed once you have adapted.The first glass of the morning: no data support it.Healthier than Gatorade (no sugar): sugar-free is genuinely better, but most people are not in a 1 h exercise session and have no use for 1000 mg of sodium either.
The real numbers for one LMNT packet:
1000 mg of sodium + 200 mg of potassium + 60 mg of magnesiumThe equivalent of 2.5 g of salt per packetThe US dietary guidelines cap sodium at < 2300 mg a day (about 1 teaspoon of salt), so one LMNT packet is already close to half the cap.An ordinary meal = 600–1000 mg of sodiumOne LMNT packet a day plus 3 takeout meals easily goes past 4000–5000 mg of sodium.
The risks of high sodium over years:
Strazzullo 2009 (BMJ, a of prospective cohort studies): people who ate more salt had about a 23% higher risk of stroke, while the rise in overall cardiovascular risk did not reach statistical significance. This is an observed association and cannot on its own prove that salt caused it.People with high blood pressure, chronic heart failure or chronic kidney disease should not add extra sodium.
So:
An hour of hard training at the gym: an occasional LMNT packet is fine.Eight hours sitting in an office plus 30 minutes of training: no electrolyte powder needed.If you are the salty-sweat, frequent-cramp type: a pinch of salt in water is 50 times cheaper than LMNT.
In practice · Mix your own for far less
Homemade electrolyte drinks are essentially equivalent in ingredients to the premium brands, at about 1/50 of the cost.A Gatorade copy (1–2 h of exercise):
1 L of water + 1/4 teaspoon of salt (1.5 g) + 2 tablespoons of sugar (25 g) + half a cup of fruit juice (for color, plus a little potassium and sugar)About 600 mg of sodium + 25 g of sugarNutritionally close to Gatorade, for about $0.20
An LMNT copy (salty sweaters, endurance exercise):
1 L of water + 1/2 teaspoon of salt (3 g) + 1/4 teaspoon of potassium chloride salt substitute (sold as No Salt in US supermarkets, and in most supermarkets) + a few drops of lemon juiceAbout 1200 mg of sodium + 600 mg of potassiumThe same dose as LMNT for about $0.10, against $3 a packet for LMNTPotassium chloride salt substitutes are high in potassium: people with kidney disease, or on drugs that raise blood potassium (such as spironolactone), should not use them.
An oral rehydration salts copy (diarrhea, severe dehydration):
1 L of clean water + 6 level teaspoons of sugar (25 g) + 1/2 teaspoon of salt (3 g)This is UNICEF's emergency recipe, close to WHO's oral rehydration salts.Imperfect (no potassium): fine for an emergency; for longer use, ideally add 1/4 teaspoon of potassium chloride salt substitute or some citrus juice.
Flavor upgrades:
Lemon or citrus juice: vitamin C and aromaDiluted apple juice: potassium and sugar, and easier to drinkDiluted coconut water: natural potassium, but extra sugar
In practice:
Regular users can keep a jar of homemade electrolyte mix: 6 parts salt + 1 part potassium chloride + 6 parts sugar, using 1 teaspoon per 1 L of water.Mix a bottle when you exercise; it is 20–50 times cheaper than pre-packaged LMNT.There is no difference in effect; the ingredients are essentially the same.
The key insight: electrolytes are sodium and potassium plus a little sugar, nothing mysterious. Pre-packaged products mainly sell packaging, flavor and the psychological suggestion of functional hydration, not any advance in chemistry.
Chapter 5
Do I need it?
Do I need electrolyte powder? The answer first: most people, most of the time, need none of it in any form.
The whole decision fits in one sentence: it only makes sense when you are right now losing a lot of sodium. That means losing fluid from acute diarrhea or vomiting, more than about an hour of heavy-sweat exercise or work in the heat, the first weeks of a ketogenic or low-carb diet, and cases where a doctor has told you to because of a diuretic or a similar reason.
Outside those, whether you want better hydration, less fatigue or a morning lift, the answer is the same: you do not need it. What actually helps is enough sleep, regular meals, and drinking water when you are thirsty.
Real red flags:
Persistent headache, nausea, seizures or a change in consciousness during or after exercise: this may be EAH, low blood sodium from drinking too much; do not drink water, and get medical care immediately.Chronic high blood pressure, heart failure or kidney disease combined with heavy use of high-sodium supplements: it makes the disease worse.
The whole decision fits in one sentence: it only makes sense when you are right now losing a lot of sodium. That means losing fluid from acute diarrhea or vomiting, more than about an hour of heavy-sweat exercise or work in the heat, the first weeks of a ketogenic or low-carb diet, and cases where a doctor has told you to because of a diuretic or a similar reason.
Outside those, whether you want better hydration, less fatigue or a morning lift, the answer is the same: you do not need it. What actually helps is enough sleep, regular meals, and drinking water when you are thirsty.
Real red flags:
Persistent headache, nausea, seizures or a change in consciousness during or after exercise: this may be EAH, low blood sodium from drinking too much; do not drink water, and get medical care immediately.Chronic high blood pressure, heart failure or kidney disease combined with heavy use of high-sodium supplements: it makes the disease worse.
In practice · Six questions to decide
Do I need electrolyte powder? Walk through six questions.Question 1: Are you dehydrated from acute diarrhea or vomiting right now?
Yes: use WHO oral rehydration salts or a homemade version of the same recipe. This is a real medical situation, not one for LMNT.No: go to question 2.
Question 2: Are you doing > 60–90 min of hard exercise (with heavy sweating) today?
Yes: go to question 2.1.No: go to question 3.
Question 2.1: What are the total time, intensity and conditions?
60–90 min at moderate intensity: water plus a banana or a slice of bread and a little salt (or Gatorade) is enough.90–180 min at high intensity or in the heat: a sodium-containing drink (300–700 mg of sodium per liter) is genuinely useful, plus 30–60 g of sugar an hour.> 180 min of ultra-endurance (marathon, triathlon, long-distance cycling): you need a proper fluid plan with high sodium (500–1000 mg/h), and individual testing is worthwhile; but sodium does not replace not overdrinking.Salty sweat and frequent cramps: add extra salt (plain salt tablets, a homemade high-sodium drink).
Question 3: Are you in the transition to a ketogenic or low-carb diet (within 1–3 weeks)?
Yes: take a temporary extra 2–3 g of sodium and 1–2 g of potassium a day (a pinch of salt and half a banana is enough) to ease keto flu.No: go to question 4.
Question 4: Do you work or train outdoors in the heat (construction workers, firefighters, military training, long-term hot yoga)?
Yes: follow the standard electrolyte replacement for your workplace, which the employer, the military or the training center usually already provides.No: go to question 5.
Question 5: Are you on a diuretic or a selective serotonin reuptake inhibitor () prescribed by a doctor, or at risk of long-term low sodium?
Yes: follow your doctor; this is not a decision to make by buying electrolyte powder yourself.No: go to question 6.
Question 6: You just want better hydration, less fatigue or a morning lift?
The answer: you do not need electrolyte powder.What really helps is enough sleep, regular meals, ordinary drinking (drink when thirsty) and moderate exercise.In this situation, electrolyte powder is a placebo you pay for, and it may also raise the risk of taking in too much sodium.
Two things to keep in mind:
Electrolyte powder is a tool, not an identity.When you really need it, food, a homemade recipe and WHO oral rehydration salts are always the gold standard; commercial brands are just packaging.
Background · Why it became so popular
Why did electrolyte powder take off in the 2020s? It makes an interesting case study in social psychology.1. Optimization culture:
An ordinary life that needs no supplements sounds too passive.Precise measurement, personalization and a top-tier product satisfy a sense of being in control.Even if chemically it is only water and salt, the ritual itself has psychological value.
2. A reaction against sugar:
Gatorade feels too 1990s, too sugary, too downmarket.Zero sugar, high sodium and a refined feel hit exactly the health-conscious urban middle class.The price ($1–3 a packet, against $0.50 a bottle for Gatorade) actually reinforces a feeling of superiority.
3. Keto, intermittent fasting and performance-optimization circles:
These groups genuinely need electrolytes during the transition.But supplement brands marketed a temporary need as a long-term lifestyle.
4. Influencers, fitness coaches and the podcast economy:
Well-known podcast hosts and fitness influencers have long promoted brands like these, including some with academic titles.The crossover effect: someone with a title endorses it, and the mass market follows.
5. Packaging, flavor and collectibility:
Flavors of every kind: watermelon, grapefruit, chocolate, holiday limited editionsPackage design: minimalist, premium, ritualisticThis is consumer-product engineering, not nutrition engineering.
A self-check:
Are you buying electrolyte powder because you have a real use for it, or because of image and culture?If you stopped for a year, would your training or your health really get worse?If the answer is no, you are buying a ritual, not chemistry.
That is not wrong; rituals have value of their own. But the key is knowing which it is: I am buying a ritual is not the same as I am meeting a physiological need. Keeping the two apart makes spending decisions more rational.
References · 6
- Sawka, M. N., Burke, L. M., Eichner, E. R., Maughan, R. J., Montain, S. J., & Stachenfeld, N. S. (2007). American College of Sports Medicine position stand: Exercise and fluid replacement. Medicine & Science in Sports & Exercise, 39(2), 377-390. Abstract content: drink to prevent excessive dehydration (more than 2% body-weight loss from water deficit) and excessive electrolyte change; sweat rates and sweat electrolyte content vary considerably between individuals, so programmes should be customised, e.g. by weighing before and after exercise. The abstract gives no sweat sodium or potassium figures (abstract, PMID 17277604). 10.1249/mss.0b013e31802ca597
- Thomas, D. T., Erdman, K. A., & Burke, L. M. (2016). American College of Sports Medicine joint position statement: nutrition and athletic performance. Medicine & Science in Sports & Exercise, 48(3), 543–568. The abstract has no g/kg numbers. Full text: protein intake to support metabolic adaptation, repair, remodelling and protein turnover generally ranges from 1.2 to 2.0 g/kg/day, with higher intakes for short periods of intensified training or reduced energy intake; about 0.3 g/kg after key sessions and every 3-5 hours over multiple meals (full text, MSSE page via Wayback snapshot 7 March 2026). 10.1249/MSS.0000000000000852
- World Health Organization. (2006). Oral rehydration salts: production of the new ORS. WHO Press. iris.who.int/handle/10665/69227
- Almond, C. S., et al. (2005). Hyponatremia among runners in the Boston Marathon. The New England Journal of Medicine, 352(15), 1550–1556. 2002 Boston Marathon: 766 enrolled, 488 gave a usable finish-line sample. Hyponatraemia (serum sodium <= 135 mmol/L) in 13%, critical (<= 120 mmol/L) in 0.6%. On multivariate analysis it was associated with weight gain (OR 4.2), racing time > 4:00 h (OR 7.4) and BMI extremes; female sex, the composition of fluids ingested (sports drink vs water) and NSAID use were not (abstract, PMID 15829535). 10.1056/NEJMoa043901
- Hew-Butler, T., Rosner, M. H., Fowkes-Godek, S., Dugas, J. P., Hoffman, M. D., Lewis, D. P., Maughan, R. J., Miller, K. C., Montain, S. J., Rehrer, N. J., Roberts, W. O., Rogers, I. R., Siegel, A. J., Stuempfle, K. J., Winger, J. M., & Verbalis, J. G. (2015). Statement of the Third International Exercise-Associated Hyponatremia Consensus Development Conference, Carlsbad, California, 2015. Clinical Journal of Sport Medicine, 25(4), 303–320. Full text read 2026-09-24 (simultaneous BJSM publication, 49(22), 1432, via a Wayback snapshot of 10 October 2024; PubMed has no abstract, PMID 26102445): the single most important risk factor is sustained excessive intake of water, sports drinks or other hypotonic fluids beyond sweat, respiratory and renal losses; all sports drinks are hypotonic (sodium about 10-38 mmol/L), so overdrinking them is not protective. Using thirst to guide drinking should limit overdrinking while preventing excessive dehydration (Grade 1C); earlier advice to drink before thirst was meant for high sweat rates; fluid deficits up to about 3% of body mass are tolerated in cool to temperate conditions. Sodium supplements cannot prevent EAH when fluid intake is excessive (Grade 1C). Treatment: symptom severity, not the sodium value, guides therapy (Grade 1A); restrict hypotonic and isotonic fluids until urinating; severe EAH with encephalopathy gets an immediate 100 mL bolus of 3% NaCl, repeated up to twice (about 10-min intervals) if there is no improvement, without waiting for a lab value (Grade 1B); IV hypotonic fluids, lactated Ringer's or normal saline are contraindicated in confirmed dilutional EAH. Travel and meals for the panel were funded by CrossFit, Inc. 10.1097/JSM.0000000000000221
- Strazzullo, P., et al. (2009). Salt intake, stroke, and cardiovascular disease: meta-analysis of prospective studies. BMJ, 339, b4567. 19 cohort samples from 13 prospective studies, 177,025 participants, 3.5-19 years of follow-up. Higher salt intake was associated with stroke (pooled RR 1.23, 1.06-1.43); total cardiovascular disease RR 1.14 (0.99-1.32; P = 0.07), significant (1.17) only after excluding one study. Observational (abstract, PMID 19934192). 10.1136/bmj.b4567