The Electrolyte Market Has a Sugar Problem
Walk into any supplement store or scroll through the sports nutrition section of Amazon and you'll find dozens of electrolyte products. Most are built around one of two formulas: a minimal electrolyte dose with a lot of sugar (Liquid IV, most sports drinks), or a high-sodium, low-sugar formula (LMNT, Precision Hydration).
These aren't equivalent, and choosing between them matters. The right product depends on your primary use case — endurance performance, heat adaptation, everyday hydration, or ketogenic/low-carb eating — and on your individual sodium needs, which vary more than most people realize.
This post breaks down what the research supports about electrolyte formulation, compares the major products on their actual numbers, and tells you when a DIY approach might serve you better than anything on the shelf.
Related: Try our Supplement Stack Audit to test this yourself. Also worth reading: Boron for Testosterone: The Overlooked Mineral and our The Complete Guide to Supplement Tracking.
What Electrolytes Actually Do
The major electrolytes are sodium, potassium, magnesium, and chloride. They regulate fluid balance across cell membranes, support nerve signal transmission, and enable muscle contraction. When you sweat, you lose primarily sodium and chloride, with smaller amounts of potassium and magnesium.
The key insight that most hydration marketing glosses over: sodium is the driver of water retention in the body. Drinking water without adequate sodium increases plasma volume temporarily, but your kidneys will excrete the excess. Drinking water with adequate sodium tells your kidneys to retain it. This is why drinking a lot of plain water during endurance exercise can lead to hyponatremia (dangerously low blood sodium) — the dilution outpaces replacement.
LMNT
Per packet: 1,000mg sodium / 200mg potassium / 60mg magnesium / 0g sugar
LMNT targets people doing endurance exercise, working in heat, following a low-carb diet (which increases sodium excretion through a different mechanism), or simply running low on sodium. Its formula is based on the relatively high sodium loss estimates from endurance exercise research and the work popularized by physicians like James DiNicolantonio.
What it does well: The 1,000mg sodium dose is meaningful. Most competing products use 200–500mg, which is less relevant to actual sweat losses in a 60+ minute workout or hot environment. The absence of sugar makes it compatible with any dietary approach.
Where it falls short: 1,000mg of sodium per packet is too much sodium for some people, particularly those who are sodium-sensitive or who are not exercising hard or sweating. It's a strong formula that needs to be matched to use context.
Best for: Hard training days, heat exposure, low-carb eaters with increased sodium needs, people who are chronically low on sodium.
Liquid IV
Per packet: 500mg sodium / 380mg potassium / 0mg magnesium / 11g sugar
Liquid IV is built on an older concept called Oral Rehydration Solution (ORS) — a formula developed by the WHO for treating dehydration from illness, using a specific glucose-to-sodium ratio to activate the SGLT-1 transporter in the intestine and accelerate water absorption.
What it does well: The glucose co-transport mechanism is real — a specific glucose-to-sodium ratio does accelerate water absorption. For rapid rehydration from illness or heavy alcohol-induced dehydration, this mechanism is relevant.
Where it falls short: For routine exercise hydration, the 11g of sugar per packet is often unnecessary. The "3x faster absorption" marketing claim is derived from ORS literature that's more relevant to clinical dehydration than to someone who drank plenty of water but wants electrolytes post-workout. The sodium dose is moderate.
Best for: Rapid rehydration after illness or significant dehydration; situations where carbohydrate intake with hydration is appropriate.
Nuun Sport
Per tablet: 300mg sodium / 150mg potassium / 25mg magnesium / 1g sugar
Nuun is lighter on sodium than LMNT but covers all three major electrolytes. The near-zero sugar formulation (1g) makes it compatible with most dietary approaches.
What it does well: Convenient tablet format. Lower sodium makes it appropriate for casual exercise and general hydration rather than intense training only. The magnesium inclusion (25mg) is a differentiator, though a modest dose.
Where it falls short: The 300mg sodium dose may be insufficient for heavy sweaters or long endurance sessions. Not as high-performance as LMNT for hard training contexts.
Best for: Moderate exercise, general daily hydration, people who find LMNT's sodium too aggressive.
Precision Hydration (PH 1000)
Per sachet (1000 series): 1,000mg sodium / 200mg potassium / 0mg magnesium / 0g sugar
Precision Hydration is a premium brand used widely in professional endurance sports. They offer multiple sodium concentration levels (250, 500, 750, 1000mg) to match individual sweat rate and sodium concentration.
What it does well: The scientific approach to individual sweat testing is a differentiator. Their in-person sweat tests and online algorithm help you find your personal sodium needs rather than guessing. The 1000 series is comparable to LMNT in electrolyte content.
Where it falls short: More expensive than most competitors. The full benefit requires using their assessment tools, not just picking a sachet.
Best for: Endurance athletes who want to dial in sodium replacement precisely. People who have had cramping or performance issues that might be sodium-related.
Pros
- +LMNT provides genuinely meaningful sodium doses for hard training or heat exposure
- +Nuun Sport is a balanced, lower-cost option for moderate daily use
- +Precision Hydration's tiered sodium formulas match individual variation
- +All four products avoid artificial colors and most are free of common allergens
Cons
- -Liquid IV's 'faster hydration' marketing is based on clinical ORS data, not typical sports use
- -LMNT's 1,000mg sodium is excessive for rest days or low-intensity exercise
- -None of these products include meaningful magnesium doses — supplement separately
- -Premium electrolyte products cost $1.50–$3 per serving, adding up quickly
The DIY Option
If you want the most control over your electrolyte formula and the lowest cost, you can build your own.
Base recipe (per 16–24oz water):
- 1/4 tsp salt (sodium chloride) ≈ 590mg sodium
- 1/8 tsp cream of tartar or NoSalt (potassium chloride) ≈ 160mg potassium
- Optional: 1/4 tsp magnesium citrate powder or a magnesium glycinate capsule
Cost: Roughly $0.10–$0.20 per serving versus $1.50–$3.00 for branded products.
The tradeoff is that you're mixing your own formula and the taste is saltier and less polished. For people who are serious about optimizing their electrolyte intake, the DIY approach is worth the small effort.
How to Track Your Electrolyte Response
The best signal that your electrolyte protocol is working is your wearable data. During hard training blocks or heat exposure, track:
- HRV morning after training: Consistently low HRV in training blocks can indicate inadequate recovery, which is sometimes electrolyte-related.
- Resting heart rate during the day: Elevated resting HR with adequate sleep may suggest dehydration or electrolyte imbalance.
- Subjective cramping or muscle twitching: Persistent cramping often responds to sodium or magnesium.
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The Bottom Line
LMNT wins for high-sweat and low-carb contexts. Nuun Sport is the versatile daily driver. Liquid IV's marketing outpaces its formula's advantage for typical fitness use. DIY gives you maximum control at minimum cost. Choose based on your use case, not the packaging.