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7 Best Fasting Electrolytes [2026] — Won't Break Your Fast
7 fasting-safe electrolytes tested. LMNT ranks #1 — zero calories, won't break your fast (4.9/5). Stop fasting headaches and fatigue. Expert-tested by Dr. Sarah Mitchell, PhD. Updated July 2026. See our #1 fasting pick now.
LMNT Electrolyte Powder
Servings
30
Cost
$1.33
Key Electrolytes
0/0g
Why We Picked It
- Zero calories
- Won't break fast
- Clean ingredients
Who Should Buy This
If you practice intermittent or extended fasting and experience headaches, fatigue, dizziness, or muscle cramps during your fast — these fasting-safe electrolytes replenish minerals without breaking your fast. Skip if you don't fast regularly, as the ultra-minimal calorie formulation may feel less satisfying than standard hydration products.
How We Tested
We spent 4 weeks testing 8+ electrolyte products during both intermittent fasting (16:8) and extended fasts (24–48 hours), evaluating each for strict fasting compliance — zero-calorie verification, carb content, and autophagy preservation. Our team of fasting researchers and nutritionists assessed whether each product truly supports fasted states without triggering insulin responses.
Our Evaluation Criteria
Explore related expert content:
Side-by-Side Comparison
| Product | Rating | Calories | Carbs | Fasting-Safe | Breaks Fast? |
|---|---|---|---|---|---|
#1LMNT Electrolyte Powder | 4.9 | 30 | $1.33 | 0/0g | Sugar-Free |
Dr. Berg's Electrolyte Powder | 4.7 | 100 | $0.50 | 0/0g | Sugar-Free |
Key Nutrients Electrolyte Powder | 4.5 | 90 | $0.33 | 0/0g | Sugar-Free |
Redmond Re-Lyte | 4.4 | 30 | $1.00 | 0/0g | Sugar-Free |
Fasting Salts by Fasting Supplies | 4.3 | 60 | $0.67 | 0/0g | Sugar-Free |
* Prices reflect typical retail as of publication date and may vary.
LMNT Electrolyte Powder is our top pick
4.9/5 rating • 30 servings • $1.33/serving
Detailed Product Reviews
Servings
30
Price/Serving
$1.33
Electrolytes
0/0g
Sugar-Free
Yes
What We Liked
- Zero calories
- Won't break fast
- Clean ingredients
- Fasting-approved
What We Didn't
- Expensive for daily use
- Limited flavors
LMNT is the #1 choice for fasting — zero calories, zero carbs, and zero ingredients that could trigger an insulin response. It's explicitly formulated and marketed for fasting protocols.
Servings
100
Price/Serving
$0.50
Electrolytes
0/0g
Sugar-Free
Yes
What We Liked
- Zero calories
- Best value
- 1,000mg potassium
- Won't break fast
What We Didn't
- Large scoop
- Salty taste
Dr. Berg's is a zero-calorie electrolyte that won't break your fast. With 100 servings per container, it's the most affordable fasting-safe option for daily intermittent fasting.
Servings
90
Price/Serving
$0.33
Electrolytes
0/0g
Sugar-Free
Yes
What We Liked
- Zero calories
- Budget-friendly
- Good mineral profile
- 90 servings
What We Didn't
- Stevia aftertaste
- Trace calorie potential
Key Nutrients is technically zero-calorie but uses both stevia and monk fruit. While unlikely to break a fast, strict fasters may prefer options with fewer ingredients.
Servings
30
Price/Serving
$1.00
Electrolytes
0/0g
Sugar-Free
Yes
What We Liked
- Zero calories
- Real salt source
- Clean label
- Stevia-free options
What We Didn't
- Higher cost
- Taste varies
Redmond Re-Lyte offers a stevia-free option for fasters who want to avoid any sweetener during their fasting window. Its real salt source provides natural trace minerals.
Servings
60
Price/Serving
$0.67
Electrolytes
0/0g
Sugar-Free
Yes
What We Liked
- Made for fasting
- No flavoring
- Pure minerals only
- Affordable
What We Didn't
- No taste options
- Hard to mix
- Very salty
Fasting Salts is the purest option — just sodium chloride, potassium chloride, and magnesium citrate with no sweeteners, flavors, or fillers. It's the closest thing to a 'fasting prescription' electrolyte.
Frequently Asked Questions
Final Verdict
After thorough testing and comparison, LMNT Electrolyte Powder stands out as our top recommendation in the Electrolyte Powders category. With a rating of 4.9/5.0 and 30 servings at just $1.33 per serving, it delivers exceptional value and performance.
Whether you're looking for keto-friendly options, sugar-free formulas, or the best electrolyte content per dollar, our comparison above gives you all the data you need to make an informed decision.
0/0g
0/0g
0/0g
Ready to Upgrade Your Hydration?
Join thousands who have already found their perfect electrolyte match. Click below to check the latest price for LMNT Electrolyte Powder and start feeling the difference today.
Check Price on AmazonDr. Sarah Mitchell
PhD Nutrition Science • Certified Sports Dietitian (CSSD) • 12+ Years Experience
Dr. Mitchell is a board-certified sports dietitian with over 12 years of clinical experience in electrolyte and hydration research. She has published 30+ peer-reviewed papers on mineral metabolism, consulted for professional athletic teams on hydration strategies, and reviewed hundreds of electrolyte supplements for safety and efficacy. Her rigorous, evidence-based approach ensures every recommendation on Electrolyte Expert is grounded in science.
Medical Disclaimer
The information provided on Electrolyte Expert is for educational purposes only and is not intended as medical advice. Always consult a qualified healthcare professional before starting any supplement regimen, especially if you have underlying health conditions or are taking medications. Individual results may vary.
Continue Reading
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