Electrolyte powder went from sports-specific to mainstream between 2020 and 2026. Brands like LMNT, Liquid I.V., Nuun, Drip Drop, Skratch, and Ultima now sit on the shelf next to bottled water, and the marketing claims overlap to the point of confusion. The reality is simpler: the right mix depends on how much, how long, and in what conditions a person sweats. A desk worker who wants a slightly more interesting glass of water has different needs than a marathoner finishing a hot summer race. This guide walks through the three electrolytes that matter most and matches dose ranges to activity profiles.
The three electrolytes that matter in a mix
Sodium is the most lost electrolyte in sweat, with concentrations typically between 600 and 1500 mg of sodium per liter of sweat. It is also the most critical to replace during long efforts because dropping blood sodium (hyponatremia) can be dangerous in extreme cases. Sodium is the central ingredient in any meaningful electrolyte mix.
Potassium is lost at much lower concentrations in sweat (around 100 to 400 mg per liter) and is well-replaced by normal eating. Most labels include 100 to 400 mg of potassium per serving as a small daily top-up.
Magnesium is lost in even smaller sweat amounts but is commonly low in modern diets because of soil depletion and food processing. Many mixes add 30 to 100 mg of magnesium per serving as general support, not because exercise depletes it dramatically.
Calcium and chloride show up on some labels too. Calcium intake is usually well-covered by diet; chloride travels with sodium and the body handles the ratio automatically.
Light hydration, daily life and easy exercise
Profile: desk work, short walks, gym sessions under 60 minutes, no heat exposure. Sweat losses are low and varied, and normal meals replace electrolyte losses across the day.
A light hydration mix targets 100 to 250 mg of sodium per serving, 50 to 200 mg of potassium, and 20 to 50 mg of magnesium. Examples in this range include Nuun Sport and Ultima Replenisher tabs. Sugar is typically 0 to 1 gram per serving.
For this profile, electrolyte mixes are optional. Plain water plus a normal diet is sufficient for the vast majority of users. The case for a light mix is taste (people drink more water when it has flavor) and a small daily potassium and magnesium top-up, not urgent electrolyte replacement.
Moderate exercise, 60 to 120 minutes
Profile: cycling, running, hiking, group fitness, recreational sports lasting one to two hours in moderate weather. Sweat losses begin to outpace what a quick post-workout meal replaces.
A moderate mix targets 400 to 700 mg of sodium per serving, 200 to 400 mg of potassium, and 30 to 80 mg of magnesium. Examples include Skratch Sport and many half-strength scoops of higher-dose mixes. Sugar in the 5 to 15 gram range per serving improves co-absorption of sodium and supports glycogen during longer efforts.
The cue for stepping up to a moderate mix is when an exercise session is long enough that water alone leaves the user feeling flat afterward, with mild headache or low-energy fog that resolves with sodium intake.
Heavy exercise and endurance, over 2 hours or in heat
Profile: long-run training, century rides, hot-yoga, half marathons, race-pace efforts over 90 minutes, day-long hiking, outdoor labor in summer. Sweat losses can hit 1 to 2 liters per hour in heavy heat.
A heavy-duty mix targets 800 to 1500 mg of sodium per serving, 200 to 500 mg of potassium, and 60 to 100 mg of magnesium. Examples include LMNT (1000 mg sodium), Drip Drop (330 mg sodium per 1/2 packet, dosed twice), and Liquid I.V. Sugar-Free Hydration Multiplier. Sugar in the 10 to 25 gram range supports both absorption and energy if no other carb source is taken alongside.
The practical rule for endurance: 500 to 700 mg of sodium per hour during heavy efforts in heat, more for heavy and salty sweaters who finish events with white salt rings on their gear. Pair fluid intake at 500 to 750 ml per hour with the electrolyte target rather than dosing one without the other.
Ultra-endurance, all-day events
Profile: ultramarathons, century rides in summer, all-day backcountry hiking, 24-hour races. Sweat losses, gastrointestinal stress, and food intolerance all compound.
Ultra-endurance dosing splits into a chase strategy and a tolerance strategy. Sodium target rises to 700 to 1200 mg per hour for heavy and salty sweaters, often delivered as a combination of a sports drink (about 400 to 600 mg per bottle), salt capsules (Saltstick, Endurolytes Extreme, about 200 to 250 mg per cap), and savory food (broth, pretzels, pickle juice). Carbohydrate intake parallel-tracks at 60 to 90 grams per hour, sometimes higher in trained athletes.
The skill in ultra is splitting the dose across small frequent intakes rather than trying to drink one giant electrolyte bottle. Stomach tolerance, not biochemistry, becomes the limiting factor.
Special cases: sauna, illness, low-carb diets
Sauna use produces significant sweat losses without exercise. A moderate to heavy electrolyte mix (500 to 800 mg sodium) after a 20 to 30 minute sauna replaces what was lost without overshooting.
Illness with vomiting or diarrhea creates rapid fluid and electrolyte loss. Drip Drop and Pedialyte are formulated for this exact scenario with WHO-style oral rehydration ratios. For most short-duration illness, a standard rehydration solution beats a sports drink because the sodium-to-sugar ratio is tuned for sick GI absorption rather than for exercise.
Low-carb and ketogenic diets reduce insulin, which causes the kidneys to excrete more sodium than usual. Many people new to keto experience the keto flu (headache, low energy, light-headedness), which often resolves with 1000 to 2000 mg of extra sodium per day from a high-sodium mix or salted broth.
How to read a label
Three numbers should be visible per serving: sodium in mg, potassium in mg, total sugar in grams. Skip products that list electrolytes as proprietary blends without milligram amounts. Ignore vague claims like cellular hydration or hydration multiplier unless backed by the actual sodium number. Match the sodium per serving to the activity profile above, the rest of the marketing is secondary.
Also check the serving size. Some packets are designed for 8 oz of water and some for 16 oz; the same mix at the wrong concentration tastes off and absorbs poorly.
When water alone is the right answer
Drinking water with no electrolytes is the right answer for: daily life with normal eating, exercise under 60 minutes in moderate weather, anyone on a sodium-restricted diet (consult a doctor for the specific limit), and anyone with hypertension or kidney disease that requires a controlled sodium intake. Most adults already eat more sodium than the daily target, and adding an electrolyte mix when sweat losses are low can push intake past the recommended ceiling. Match the tool to the moment, and always consult your doctor before regular use, especially with blood pressure or kidney conditions.
Frequently asked questions
Do I really need electrolytes, or is plain water fine?+
For most daily life and exercise under 60 minutes, plain water plus normal meals is fine. The kidney and the gut handle electrolyte balance well across a wide range of fluid intakes. Electrolyte mixes become useful when sweat losses exceed what diet replaces in a short window: exercise over 60 minutes in heat, all-day outdoor work, heavy sweating from illness or sauna use, and endurance events. The benefit is not magical; it is matching sodium intake to sodium loss to avoid dilutional hyponatremia and cramping.
Why do some electrolyte mixes have 1000 mg of sodium and others have 200 mg?+
Because they are designed for different sweat profiles. A high-sodium mix (LMNT, Liquid I.V. Sugar-Free, Drip Drop) targets endurance athletes, outdoor workers, and people on keto or sodium-restricted-by-mistake diets. A low-sodium mix (Nuun, Ultima, hint of sodium per tab) targets light exercise and general hydration. Neither is universally right. Sodium needs scale with sweat volume, duration, and heat exposure; the heavier the sweat losses, the higher the sodium content that fits.
Is sugar in an electrolyte drink a problem?+
It depends on the use case. Glucose and sodium absorb together through the same intestinal cotransporter (SGLT1), so a small amount of sugar (about 2 to 6 percent solution, or 5 to 15 grams per 12 to 16 oz bottle) actually improves fluid and sodium absorption during exercise. For general daily hydration outside exercise, sugar is unnecessary and most users prefer sugar-free mixes. The trick is matching the formula to the moment, not avoiding sugar absolutely.
Can too many electrolytes cause problems?+
Yes, especially sodium and potassium. Chronic high sodium intake raises blood pressure in sodium-sensitive users and people with hypertension. Potassium has a clinical upper limit because excess potassium is dangerous in users with kidney disease, on potassium-sparing diuretics, or on ACE inhibitors. Magnesium at very high oral doses (over 600 mg of elemental magnesium daily) causes diarrhea. The risk profile depends on existing conditions and medications. Consult your doctor before regular use, especially with kidney disease or blood pressure medication.
Do electrolyte mixes prevent muscle cramps?+
Sometimes, but not always. The classic dehydration-cramping model has been challenged by research showing that many exercise cramps come from neuromuscular fatigue and altered motor-neuron firing rather than electrolyte deficits alone. Sodium replacement does help cramping in heavy sweaters, especially salty sweaters in hot conditions. For some users, cramps respond more to slowing pace, training the muscle group, and pickle juice (a TRP-channel response). Electrolytes are one tool, not the only tool.
Alex Patel
Alex Patel writes for The Tested Hub.