Electrolytes
Essential minerals (sodium, potassium, magnesium) for hydration, muscle function, nerve signaling, and exercise performance
Bottom Line
Electrolyte balance is fundamental to performance and health. Most people underestimate sodium needs, especially active individuals and those on low-carb diets. Proper electrolyte intake prevents cramps, maintains hydration, supports cognitive function, and can dramatically improve exercise performance.
One of the most underrated interventions. If you exercise regularly, sweat a lot, or eat low-carb, you almost certainly need more electrolytes than you're getting.
Science
Mechanisms:
- Sodium: Primary extracellular electrolyte, regulates fluid balance, nerve transmission
- Potassium: Primary intracellular electrolyte, muscle contraction, heart function
- Magnesium: Cofactor in 300+ reactions, muscle relaxation, energy production
- Chloride: Works with sodium for fluid balance and stomach acid production
- Calcium: Muscle contraction, bone health, nerve signaling
Key studies:
- Sawka et al. (2007): ACSM position stand on hydration and electrolytes
- Shirreffs et al. (2004): Sodium essential for complete rehydration
- Schucany (2007): Exercise-associated hyponatremia risks
Effect sizes:
- Exercise performance: Moderate to large (especially in heat/endurance)
- Cramping prevention: Large
- Cognitive function: Moderate (when depleted)
- Recovery: Moderate
Why deficiency is common:
- Low-carb/keto diets increase sodium excretion
- Heavy sweating depletes all electrolytes
- Processed food avoidance reduces sodium
- Athletes can lose 1-2g sodium per hour
Supporting Studies
6 peer-reviewed studies
View all studies & compare research →Practical Protocol
Daily baseline (sedentary):
- Sodium: 2,000-3,000mg
- Potassium: 3,500-4,700mg
- Magnesium: 300-400mg
Active individuals / Athletes:
- Sodium: 3,000-5,000mg (more if heavy sweating)
- Potassium: 4,000-5,000mg
- Magnesium: 400-600mg
Low-carb / Keto:
- Add 1,000-2,000mg sodium above baseline
- Potassium and magnesium needs also increase
Pre-workout (30-60 min before):
- 500-1,000mg sodium
- 200-400mg potassium
- Water to thirst
During exercise (>60 min or heavy sweat):
- 500-1,000mg sodium per hour
- 200-400mg potassium per hour
- Drink to thirst, not on schedule
Post-workout:
- Replace what you lost (1.5x fluid lost)
- Include sodium for retention
- Food sources work well here
Signs you need more:
- Muscle cramps
- Headaches
- Fatigue
- Dizziness on standing
- Poor exercise performance
- "Keto flu" symptoms
Risks & Side Effects
Known risks:
- Excess sodium with kidney disease (monitor carefully)
- Hyperkalemia risk with kidney disease (dangerous)
- GI upset with high single doses
Contraindications:
- Kidney disease (consult doctor, monitor levels)
- Heart failure (sodium restriction may be needed)
- Medications affecting potassium (ACE inhibitors, etc.)
Hyponatremia warning:
- Drinking too much plain water during exercise dilutes sodium
- Can be dangerous or fatal in extreme cases
- Always include sodium with high fluid intake
Upper limits:
- Don't exceed 5-6g sodium unless heavy sweating + medical guidance
- Potassium supplements typically capped at 99mg per pill (safety)
- Get potassium from food when possible
Who It's For
Ideal for:
- Athletes and regular exercisers
- Heavy sweaters
- Low-carb/keto dieters
- Those in hot climates
- Anyone with muscle cramps
- Fasting practitioners
Should be careful:
- Kidney disease patients (monitor with doctor)
- Heart failure patients (sodium may be restricted)
- Those on potassium-sparing diuretics
Signs you're deficient:
- Muscle cramps or twitches
- Headaches
- Fatigue despite sleep
- Lightheadedness
- Poor workout performance
- Brain fog
How to Track Results
What to measure:
- Body weight before/after exercise (sweat loss)
- Urine color (pale yellow = good hydration)
- Cramping frequency
- Energy levels
- Exercise performance
Sweat rate calculation:
1. Weigh yourself before exercise (naked, after urinating) 2. Exercise for 1 hour 3. Weigh yourself after (naked, towel dry) 4. Each kg lost ≈ 1 liter sweat 5. Add any fluid consumed during - This tells you hourly fluid needs
Blood testing (optional):
- Basic metabolic panel includes sodium, potassium
- RBC magnesium (better than serum)
- Useful if symptoms persist despite supplementation
Signs it's working:
- No more cramps
- Better exercise performance
- More energy
- Clear thinking
- Less post-workout fatigue
Top Products
Top recommendations:
- LMNT - 1,000mg sodium, 200mg potassium, 60mg magnesium (no sugar)
- Drip Drop - Medical-grade ORS
- Liquid IV - Popular, good taste (has sugar)
- Nuun - Tablets, low calorie
Budget DIY option:
- 1/4 tsp salt (500mg sodium)
- 1/4 tsp lite salt (250mg sodium + 350mg potassium)
- Squeeze of lemon
- Water
- Cost: ~$0.05 per serving
Liquid / Bioavailable:
- PristineHydro Electrolyte Balance - Magnesium bicarbonate + silica, liquid form, premium ($46/16 servings)
Individual electrolytes:
- Morton Lite Salt - Sodium + potassium
- NOW Potassium Citrate
- Magnesium (see Magnesium page)
What to avoid:
- Gatorade/Powerade (mostly sugar, low electrolytes)
- Products with artificial colors
- Very low sodium "electrolyte" waters
Cost Breakdown
Budget ($5-15/month):
- DIY salt + lite salt: ~$5/month
- Table salt + potassium supplement: ~$10/month
Mid-range ($20-40/month):
- LMNT (30 packets): ~$45/month
- Drip Drop: ~$30/month
- Nuun tablets: ~$20/month
Premium ($40+/month):
- Multiple daily LMNT: ~$60-90/month
- Combination of products
Cost-per-benefit assessment:
DIY is nearly free and works just as well. Commercial products offer convenience and taste. LMNT is popular but pricey - DIY with lite salt is 95% as effective at 5% the cost.
Recommended Reading
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Discussed in Podcasts
How salt demonization began with flawed rat studies
DiNicolantonio explains that most nutritional advice on salt stems from expert opinion predating the Cochrane group, and that early evidence came from researcher Louis Dahl who had to breed genetically salt-sensitive rats because normal rats would not become hypertensive even at 10 times normal salt intake.
Salt restriction activates artery-stiffening hormones
DiNicolantonio reveals that dropping sodium below 3,000 mg per day triggers increases in renin, angiotensin II, aldosterone, insulin, total cholesterol, LDL, and triglycerides. Population studies show the lowest risk of death at 3,000-5,000 mg sodium per day, and most apparent salt sensitivity is actually driven by insulin resistance from refined carbs and sugar.
Humans evolved to lose salt faster than any other mammal
DiNicolantonio describes how humans sacrificed the ability to retain salt so they could cool down through sweat and persist in hunting animals over long distances. We lose more salt through sweat than any other mammal, making us uniquely vulnerable to rapid salt depletion that can become fatal within 1-2 hours in extreme heat.
Low-salt diets hijack the dopamine reward system
DiNicolantonio explains how inadequate salt intake hyperactivates the brain's dopamine reward system, which evolved to drive salt-seeking behavior. In the modern food environment, this mechanism gets hijacked by sugar and other addictive substances, increasing food cravings and promoting weight gain through a cycle of insulin resistance and internal starvation.
Electrolytes Discussion
That's why you have to make sure you put a check in front of all these underlying conditions. I'd like to take a quick break and acknowledge one of our sponsors, Element.
Electrolytes: Benefits
Welcome to Huberman Lab Essentials, where we revisit past episodes for the most potent and actionable science-based tools for mental health, physical health, and performance.
Who to Follow
Researchers:
- Tim Noakes, MD - Challenged overhydration dogma, wrote "Waterlogged"
- James DiNicolantonio, PharmD - Author of "The Salt Fix"
- Stacy Sims, PhD - Women's hydration and performance expert
Practitioners:
- Robb Wolf - Co-founder of LMNT, keto/paleo advocate
Synergies & Conflicts
Pairs well with:
- Creatine - Both support muscle hydration
- Magnesium - Often bundled in electrolyte products
- Zone 2 Cardio - Extended cardio depletes electrolytes
- Sauna - Heavy sweating requires replacement
Timing:
- Pre-workout: 30-60 minutes before
- During: Every 30-60 min for long sessions
- Post-workout: With recovery meal
- Daily: Spread throughout day
Keto/Low-carb stack:
- Higher baseline sodium (3-5g)
- Magnesium glycinate before bed
- Lite salt for potassium
- Critical for avoiding "keto flu"
What People Say
Why it's trending:
Common positive reports:
Common complaints: