Electrolyte powders 2026 — LMNT, Liquid I.V., Nuun, Ultima, Pedialyte and the rest, ranked on sodium, sugar and who actually needs them

What it claims

• 'Hydrates 2–3x faster than water' — the cellular-transport-technology claim, usually Liquid I.V.
• 'Optimal electrolyte ratio', 'no sugar, no junk' — the LMNT-style performance framing
• 'Fights brain fog, headaches, fatigue and cramps'
• 'Daily hydration support' — the everyday sipper positioning of Nuun and Ultima
• 'Doctor formulated', 'medical-grade rehydration' — DripDrop, Pedialyte and their imitators

What the label is not telling you

• 'Hydrates faster than water' is an oral-rehydration-therapy claim borrowed from a dysentery context. The mechanism is real: sodium-glucose cotransport (SGLT1) pulls sodium, glucose and water across the intestinal wall together, which is why WHO ORS saved millions of lives in diarrhoeal illness. It requires glucose and a specific osmolarity band (roughly 245 mOsm/L in the WHO reduced-osmolarity formula). A zero-sugar stick cannot invoke that mechanism at all — there is no glucose to cotransport with. A sugar-containing stick can, if the osmolarity is right. Most consumer sticks are not formulated to the WHO band and are not tested against it.
• Sodium content varies by more than tenfold across the shelf, and the label rarely frames it usefully. LMNT is ~1,000 mg sodium per stick. Nuun sits near 300 mg. Ultima is closer to 55 mg. Pedialyte is a rehydration solution, not a sports drink. If you are choosing 'an electrolyte', you are actually choosing a sodium dose, and the correct dose depends on sweat rate, sweat sodium concentration (which varies roughly 200–2,000 mg/L between individuals) and duration. Precision Hydration is the only mainstream brand built around that variance rather than around one number.
• The low-carb and fasting crowd is the real reason the sodium sticks exploded. Cutting carbohydrate lowers insulin, and lower insulin increases renal sodium excretion — that is the well-described mechanism behind 'keto flu' fatigue, headache and lightheadedness. In that context a 1,000 mg sodium stick is straightforwardly corrective. In a person eating a normal mixed diet with bread, cheese and restaurant food, adding 2–3 g of sodium a day on top is a different intervention with a different risk profile, particularly for anyone salt-sensitive or hypertensive.
• 'No sugar' is a selling point that removes a functional ingredient. In an endurance context, carbohydrate in the drink is not a contaminant — it is fuel and it is the cotransport vehicle. Skratch and the sports-nutrition brands keep the sugar for that reason. Zero-sugar sticks are the right pick for a desk day or a fasted state, and the wrong pick for hour three of a long ride.
• Magnesium in most sticks is a rounding error, and often the wrong form. Typical inclusions land at 5–10% of a daily intake, frequently as magnesium oxide, which is poorly absorbed. If magnesium is the actual goal, an electrolyte stick is an expensive and ineffective delivery route.
• Overhydration is under-discussed and genuinely dangerous. Exercise-associated hyponatraemia — diluting plasma sodium by drinking large volumes of plain water during prolonged effort — remains a real cause of collapse and death in endurance events (Hew-Butler and the consensus statements from 2005 onward). The correct fix is not 'drink less', it is 'match sodium to what you are drinking'. This is the one place the powders have a clear, life-safety justification, and it is the least prominent claim on the box.
• Thirst is a better instrument than the internet gives it credit for. The 'eight glasses' figure has no strong physiological basis; drinking to thirst, with sodium replaced proportionally to sweat, matches every current sports-medicine consensus. Colour-of-urine charts are crude but adequate. A subscription is not a sensor.

Effect on the nervous system

Sodium and water status sit directly upstream of autonomic function, which is why mild dehydration and low sodium feel like anxiety. Plasma volume is what the baroreflex regulates against; drop it and the sympathetic branch compensates with vasoconstriction and a higher heart rate to defend blood pressure. Subjectively that arrives as a racing pulse standing up, a light head, a shortened fuse and the jittery, wired quality people usually blame on caffeine or stress. Anyone with POTS or orthostatic intolerance already knows this — sodium and fluid loading is a first-line non-pharmacological intervention in that population precisely because it raises plasma volume and reduces the compensatory sympathetic drive. The same mechanism, in milder form, explains why a hot day, a long sauna, a low-carb week or a night of poor sleep can make an ordinary afternoon feel unmanageable. Hydration is not a wellness accessory here; it is one of the cheapest levers on autonomic stability. It just does not need to cost forty euros a month.

Who it might suit

Anyone training over an hour, in heat, or sweating heavily — match sodium to sweat rate rather than to the brand's default. Anyone low-carb, fasting or in the first weeks of a carbohydrate reduction. Anyone with POTS, orthostatic intolerance or a clinician-flagged low sodium intake. Illness with fluid loss, where a properly formulated oral rehydration solution (Pedialyte, DripDrop, WHO-style) beats a sports stick outright. Sauna users, hot-yoga regulars, and anyone whose sweat dries visibly white and salty — that is a high sweat-sodium phenotype and the sticks genuinely help.

Who should skip it

Anyone with hypertension, kidney disease, heart failure or on sodium-restricted medical advice, adding 1 g of sodium a day because a podcast recommended it — that is a conversation with a clinician, not a subscription decision. Anyone using electrolytes to fix a fatigue that is actually a sleep-debt or under-eating problem. Anyone drinking large volumes of plain water during endurance events without sodium replacement — that is the actual hazard, and the fix is proportion, not volume.

Bottom line

Honest hierarchy: (1) Water plus a normally salted diet for a normal day — free, and correct for most people most of the time. (2) A high-sodium stick (LMNT, Precision Hydration's higher tiers, or a DIY mix of salt, a pinch of potassium salt and lemon) when sweat loss, heat, low-carb eating or orthostatic symptoms make sodium the actual deficit. (3) A glucose-containing oral rehydration solution (Pedialyte, DripDrop, WHO-style) for illness and true dehydration — this is where the cotransport mechanism is real. (4) Carb-containing sports mixes (Skratch, and their peers) for efforts over ninety minutes, where the sugar is the point. (5) Low-dose daily sippers (Nuun, Ultima) if flavour is what gets you drinking — fine, just do not expect the magnesium to do anything. Make it cheaper: 1/4 tsp table salt plus a squeeze of citrus in 500 ml delivers roughly what a premium stick does for a few cents. Track morning heart rate, standing lightheadedness and afternoon energy through a two-week hydration change in a Nervous System Journal — the autonomic readout is faster and more honest than how you think you feel.