Electrolytes: What They Are, Who Needs Them & Which Powder to Buy
Educational overview — not medical advice. If you have high blood pressure, kidney disease, or heart failure, or take diuretics or BP medication, talk to your doctor before adding a high-sodium product.
Electrolytes are minerals — mostly sodium, potassium, and magnesium — that manage fluid balance, nerves, and muscle. The whole category is really a sodium delivery business, and here's the part the marketing skips: most people on a normal diet don't need a supplement. Where they genuinely help is heavy sweating, keto or fasting, illness, and conditions like POTS. Below: how much you need, when sugar helps, and which of 12 products are actually third-party tested (only 3).
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The one chart that explains the category
Every electrolyte product looks the same on the shelf and says "electrolytes" on the front. The actual sodium — the thing that matters — varies 18-fold, and almost none are independently tested:
| Item | Value (mg) |
|---|---|
| LMNT | 1000 mg |
| Redmond | 810 mg |
| BUBS Naturals | 650 mg |
| Liquid I.V. | 530 mg |
| Liquid I.V. | 500 mg |
| Transparent Labs | 500 mg |
| Gatorade | 490 mg |
| DripDrop | 330 mg |
| Nuun | 300 mg |
| Pedialyte | 260 mg |
| SaltStick | 100 mg |
| Ultima | 55 mg |
Who actually needs them (and who doesn't)
The honest version, because the industry won't say it: if you eat a normal diet and your workouts are under an hour, food and water cover your electrolytes. The ACSM position statement only recommends electrolyte drinks for prolonged or intense exercise, heavy sweating, or heat — not for daily life. The four situations where supplementing genuinely earns its place:
- Prolonged or intense exercise / heat — you sweat out real sodium (roughly 300–600 mg/hour), and it varies a lot person to person.
- Keto, low-carb, or fasting — low insulin makes your kidneys shed sodium, which is the leading theory behind "keto flu."
- Illness — vomiting and diarrhea lose fluid and sodium fast; this is where a sugar-containing oral-rehydration formula shines.
- POTS / low blood pressure — a diagnosed condition where clinicians prescribe high sodium and fluid, under supervision.
How much for each is broken down in the dosage guide.
Why sugar is on some labels (and it's not a scam)
Glucose and sodium are absorbed across the gut wall together, dragging water with them — the mechanism behind medical oral rehydration solutions. So a little sugar genuinely speeds rehydration when you're depleted from illness or a hard, hot effort. For everyday sipping, keto, or fasting, that sugar is just unnecessary carbohydrate, and a zero-sugar formula is the better fit. The choice isn't "sugar bad / sugar good" — it's matching the formula to the job, which the formulas comparison lays out.
The certification gap
In a category selling "clean" hydration, almost nothing is independently verified. Of 12 products we track, only 3 carry a real product-level third-party certification — BUBS Hydrate or Die (NSF Certified for Sport), Transparent Labs Hydrate and SaltStick FastChews (Informed Choice). The biggest names, LMNT and Liquid I.V., have none. That's the single most useful filter if you're a tested athlete, and it's the column we lead with in the rankings.
Frequently asked questions
What are electrolytes and what do they do?
Charged minerals — mainly sodium, potassium, magnesium, chloride — that manage fluid balance, nerve signals, and muscle contraction. Sodium matters most for hydration: it's the primary electrolyte lost in sweat and it drives gut water absorption.
Do I actually need an electrolyte supplement?
Most people on a normal diet who exercise under ~60 minutes don't — water and food are enough. Real cases: prolonged/intense exercise, keto or fasting, illness with fluid loss, or physician-directed POTS.
What should I look for in an electrolyte powder?
Actual sodium in mg (55–1,000 across products; under ~100 is flavored water), sugar (helps for rehydration, unnecessary otherwise), cost per serving ($0.05 DIY to $1.85), and whether it's third-party tested — few are.
Related guides
- Magnesium — most electrolyte drinks are low in it; here's how to cover it
- Creatine — often paired with electrolytes for training
- Vitamin D — another common gap worth testing before you supplement
Sources
- Thomas DT, et al. "ACSM Joint Position Statement. Nutrition and Athletic Performance." Med Sci Sports Exerc. 2016. PMID: 26891166
- Wright EM, Loo DDF, Hirayama BA. "Biology of human sodium glucose transporters." Physiol Rev. 2011. PMID: 21527736
- Baker LB. "Sweating Rate and Sweat Sodium Concentration in Athletes." Sports Med. 2017. PMID: 28332116
- Full product dataset: /electrolytes/formulas-compared.json (CC BY 4.0).