After 30 days of testing 10+ electrolyte powders, our top pick is Dr. Berg's Electrolyte Powder — 400 mg sodium, 350 mg potassium, and 100 mg magnesium per serving, zero sugar, and 270 servings per tub at about $0.15 per serving. It aligns with the numbers that matter in hydration science: a liter of sweat carries roughly 800 mg of sodium on average (Baker et al., 2016), and the American College of Sports Medicine recommends adding 0.5–0.7 g of sodium per liter of fluid during exercise lasting over an hour (ACSM, 2007). If you sweat heavily or move into a ketogenic diet, LMNT's 1,000 mg sodium serving is the stronger fit. Here is our honest, evidence-based comparison.
Quick Answer
Dr. Berg's Electrolyte Powder is our top pick: 400 mg sodium, 350 mg potassium, and 100 mg magnesium per serving, zero sugar, ~$0.15 per serving, backed by a balanced Na–K–Mg profile consistent with NIH and NASEM intake targets. For heavy sweaters and keto dieters, LMNT (1,000 mg sodium per serving) is the closer match to ACSM fluid-replacement guidance.
We tested each product for 30 days, measuring mixability, taste, electrolyte content accuracy, and real-world hydration effectiveness. Below you'll find our honest assessment to help you make the right choice for your specific needs and budget.
How We Test
Table of Contents
Side-by-Side Comparison
| # | Product | Rating | Price | Servings | Sugar | Form | Best For | Buy |
|---|---|---|---|---|---|---|---|---|
| 🥇 | Dr. Berg's Electrolyte Powder by Dr. Berg | (4.6) | $39.99 | 270 | 0g ✓ | powder | ketofasting | Check Price → |
| 🥈 | Nuun Sport Electrolyte Tablets by Nuun | (4.6) | $19.99 | 40 | 1g | tablet | runnersfitness | Check Price → |
| 🥉 | Key Nutrients Electrolyte Powder by Key Nutrients | (4.5) | $29.95 | 240 | 0g ✓ | powder | valuehigh-servings | Check Price → |
| #4 | Ultima Replenisher Electrolyte Powder by Ultima | (4.5) | $39.99 | 90 | 0g ✓ | powder | clean-ingredientssugar-free | Check Price → |
| #5 | LMNT Electrolyte Powder by LMNT | (4.4) | $45.00 | 30 | 0g ✓ | packet | ketozero-sugar | Check Price → |
Our Top Pick
Dr. Berg's Electrolyte Powder
Sodium 400mg · Potassium 350mg · Magnesium 100mg · Chloride · Trace minerals — 4.6 stars from 11 200 ratings
Check Best Price on Amazon →Detailed Product Reviews
Dr. Berg's Electrolyte Powder
Dr. Berg
\u2705 Pros
- +High magnesium content
- +Vitamin D added
- +Zero sugar
\u2716 Cons
- \u2013Only one flavor
- \u2013Contains stevia (not for everyone)
Nuun Sport Electrolyte Tablets
Nuun
\u2705 Pros
- +Portable tablets
- +Low sugar
- +Great for travel
\u2716 Cons
- \u2013Lower electrolyte content
- \u2013Not for severe dehydration
Key Nutrients Electrolyte Powder
Key Nutrients
\u2705 Pros
- +Best value at $0.12/serving
- +Zero sugar
- +Complete electrolyte profile
\u2716 Cons
- \u2013Plain flavor options
- \u2013Large container not travel-friendly
Ultima Replenisher Electrolyte Powder
Ultima
\u2705 Pros
- +Clean ingredients
- +Great taste
- +Vegan friendly
\u2716 Cons
- \u2013Low sodium per serving
- \u2013Premium price point
LMNT Electrolyte Powder
LMNT
\u2705 Pros
- +Highest sodium content (1000mg)
- +Zero sugar
- +No artificial ingredients
\u2716 Cons
- \u2013Higher price per serving
- \u2013Intense salty taste not for everyone
Frequently Asked Questions
What is the best electrolyte powder overall?
How much sodium do I need in an electrolyte powder?
Are sugar-free electrolyte powders effective?
When should I take electrolyte powder?
Final Verdict
The verdict comes down to numbers, not marketing. The National Academies of Sciences sets adequate sodium intake at 1,500 mg/day for adults, with 2,300 mg/day as the threshold above which chronic-disease risk rises (NASEM, 2019), and magnesium needs at 400–420 mg/day for men and 310–320 mg/day for women (NIH ODS). Dr. Berg's Electrolyte Powder covers the daily baseline with a balanced electrolyte ratio and zero sugar; LMNT is the heavy-sweat specialist. Start with our top pick — the safest, most cost-effective, science-backed choice for daily hydration.
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Shop Top Pick on Amazon →Dr. Sarah Chen, RD
Board-Certified Sports Dietitian
Registered dietitian and certified sports nutrition specialist. Dr. Chen reviewed every electrolyte recommendation against current NIH, NASEM, and ACSM guidance before publication.
Scientific Sources
- 1.Baker LB, et al. Sweating Rate and Sweat Sodium Concentration in Athletes. J Sports Sci. 2016 (PMID 26070030) source
- 2.American College of Sports Medicine. Exercise and Fluid Replacement: Position Stand. Med Sci Sports Exerc. 2007 (PMID 17277604) source
- 3.National Academies of Sciences, Engineering, and Medicine. Dietary Reference Intakes for Sodium and Potassium (2019) source
- 4.NIH Office of Dietary Supplements. Magnesium: Fact Sheet for Consumers source
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