Instant Hydration and LMNT are both premium, zero-sugar electrolyte stick packs priced near the top of the market — $1.60 and $1.50 per serving respectively. They look like direct competitors. The deciding difference is sodium: LMNT packs 1,000mg per serving, Instant Hydration 500mg. At essentially the same price, that's twice the sodium per dollar from LMNT.
The quick answer: if sodium is what you're after — for keto, fasting, POTS, or heavy sweating — LMNT delivers double the sodium for slightly less money, and it's far cheaper per gram of sodium. Instant Hydration's advantages are narrower: more potassium (300mg vs 200mg) and a stevia/monk fruit sweetener blend some people prefer to LMNT's pure stevia. Both are zero sugar and both are stick packs.
Instant Hydration vs LMNT: The Numbers Side by Side
Both products are 30-serving stick-pack boxes at roughly $48 and $45. The electrolyte profiles are where they diverge.
| Metric | Instant Hydration | LMNT | Difference |
|---|---|---|---|
| Sodium | 500mg | 1,000mg | LMNT has 2x more |
| Potassium | 300mg | 200mg | Instant Hydration has 1.5x more |
| Magnesium | 45mg | 60mg | LMNT has 1.3x more |
| Sugar | 0g | 0g | Both zero sugar |
| Sweetener | Stevia/Monk Fruit | Stevia | Instant Hydration adds monk fruit |
| Form | Stick Pack | Stick Pack | Same |
| Price/serving | $1.60 | $1.50 | LMNT is 6% cheaper |
| $/g sodium | $3.20 | $1.50 | LMNT is 2.1x cheaper per g |
| Servings/box | 30 | 30 | Same |
| Box price | $48.00 | $45.00 | LMNT is $3 less |
Data verified against manufacturer websites. Prices as of March 2026. See the full 17-brand comparison →
The number that settles most of this comparison is cost per gram of sodium. Instant Hydration costs $3.20/g; LMNT costs $1.50/g. Despite nearly identical per-serving prices, LMNT gives you more than twice the sodium per dollar. For a product category where sodium is usually the point, that's a big gap.
Where LMNT Wins
Sodium content (1,000mg vs. 500mg). LMNT delivers double the sodium per serving. Endurance research supports replacing 500-1,150mg of sodium per liter of sweat during intense exercise.[1] One LMNT packet lands in that range on its own; you'd need two Instant Hydration servings to get there.
Cost per gram of sodium ($1.50 vs. $3.20). Because the two cost about the same per serving but LMNT has twice the sodium, LMNT is more than 2x cheaper per gram of sodium. If sodium is your reason for buying, this is the metric that matters.
Magnesium (60mg vs. 45mg). LMNT provides a third more magnesium per serving, a mineral many people under-consume.
Slightly lower price. At $1.50 vs $1.60 per serving and $45 vs $48 per box, LMNT is marginally cheaper outright — unusual, since it's also the higher-sodium product.
Where Instant Hydration Wins
Potassium (300mg vs. 200mg). Instant Hydration provides 1.5x more potassium per serving. Potassium supports fluid balance and muscle function, and many people fall short of recommended intake. If you want a higher potassium-to-sodium ratio, Instant Hydration delivers it.
Sweetener blend. Instant Hydration uses a stevia and monk fruit blend. Some people find this combination smoother or less bitter than LMNT's pure stevia. Taste is personal, but the monk fruit addition is a genuine point of difference.
Lower sodium can be a feature. Not everyone wants 1,000mg of sodium in one drink. For lighter activity or people who find LMNT too salty, Instant Hydration's 500mg is a more moderate dose while still being a real electrolyte serving.
The Sodium-Per-Dollar Question
This matchup is a clean illustration of why per-serving price can mislead. Instant Hydration and LMNT cost almost the same per serving, so a quick glance suggests they're comparable value. But LMNT contains twice the sodium, so its cost per gram of sodium is less than half.
If you need a high daily sodium intake — common on keto, during fasting, or for POTS — that gap compounds fast. Hitting 3,000mg of sodium takes 3 LMNT packets ($4.50) or 6 Instant Hydration packets ($9.60). Over a month, that's the difference between roughly $135 and $288 just to reach the same sodium target. How much electrolytes should actually cost walks through this metric across all 17 brands.
Who Should Choose LMNT
- Keto, carnivore, and low-carb dieters who need to replace 3,000-5,000mg of sodium per day.
- Heavy sweaters and endurance athletes training 60+ minutes or in the heat.
- Intermittent fasters who want maximum zero-sugar sodium per packet.
- Anyone buying primarily for sodium value, since LMNT is 2x cheaper per gram of sodium.
Who Should Choose Instant Hydration
- Potassium-focused buyers who want a higher potassium dose (300mg) per serving.
- People who prefer the taste of a stevia/monk fruit blend over pure stevia.
- Moderate users who find 1,000mg of sodium per drink more than they need.
If your main objection to LMNT is the price — and you still want high sodium — neither of these premium stick packs is the cheapest route. There are cheaper alternatives to LMNT that keep 1,000mg sodium at a fraction of the per-serving cost by using a tub/scoop format.
The Bottom Line
Instant Hydration and LMNT are genuine competitors — both premium, zero-sugar stick packs at nearly the same price. For most buyers, LMNT is the better value because it delivers twice the sodium for slightly less money, plus a bit more magnesium. Instant Hydration earns its place if you specifically want more potassium or prefer its monk fruit sweetener blend. But if sodium per dollar is your yardstick, LMNT wins this one clearly.
For a full breakdown of how Instant Hydration and LMNT compare against 15 other electrolyte brands on sodium, price, and cost per gram of sodium, see our complete 17-brand comparison table.
References
- Vitale K, Getzin A. "Nutrition and Supplement Update for the Endurance Athlete: Review and Recommendations." Nutrients, 2022; 14(7):1318. pmc.ncbi.nlm.nih.gov