Ultima Replenisher and LMNT both show up on "best electrolyte" lists, but they're aimed at opposite ends of the market. Ultima is a low-sodium, zero-sugar flavored powder built around potassium and magnesium, priced for daily use at about $0.53/serving. LMNT is a high-sodium stick pack (1,000mg per serving) built for keto dieters, fasters, and heavy sweaters, at $1.50/serving.
The quick answer: if you want an affordable, good-tasting daily hydration drink with a solid magnesium and potassium dose, Ultima wins on price and flavor. If you need real sodium replacement — for low-carb diets, fasting, POTS, or hard training in the heat — LMNT delivers 18x more sodium per serving, and it's actually cheaper per gram of sodium. Neither is "better." They solve different problems.
Ultima Replenisher vs LMNT: The Numbers Side by Side
The sodium gap is the entire story here. LMNT has 1,000mg per serving; Ultima has 55mg. Everything else follows from that one difference.
| Metric | Ultima Replenisher | LMNT | Difference |
|---|---|---|---|
| Sodium | 55mg | 1,000mg | LMNT has 18x more |
| Potassium | 250mg | 200mg | Ultima has 1.25x more |
| Magnesium | 100mg | 60mg | Ultima has 1.7x more |
| Sugar | 0g | 0g | Both zero sugar |
| Sweetener | Stevia | Stevia | Same |
| Form | Powder (canister & stick) | Stick Pack (powder) | Both powders |
| Price/serving | $0.53 | $1.50 | Ultima is 65% cheaper |
| $/g sodium | $9.64 | $1.50 | LMNT is 6.4x cheaper per g |
Data verified against manufacturer websites. Prices as of March 2026. See the full 17-brand comparison →
Here's the number that matters most if you're buying electrolytes for sodium: cost per gram of sodium. Ultima looks cheap at $0.53/serving, but because it contains so little sodium, you pay about $9.64 for every gram of sodium. LMNT, despite costing nearly 3x more per serving, comes in at $1.50/g. That's the trap with per-serving pricing — it hides how little of the headline electrolyte you're actually getting.
Where Ultima Replenisher Wins
Price per serving ($0.53 vs. $1.50). Ultima costs roughly a third of LMNT per serving. For a daily, year-round hydration habit, that's about $193/year versus $548/year for LMNT used daily. If you don't need high sodium, you're overpaying with LMNT.
Magnesium (100mg vs. 60mg). Ultima delivers 1.7x more magnesium per serving, a mineral most people under-consume. If magnesium is a priority — for sleep, muscle function, or general supplementation — Ultima provides a more meaningful dose.
Potassium (250mg vs. 200mg). Ultima edges out LMNT on potassium too. The margin is smaller, but combined with the magnesium advantage, Ultima is the stronger pick if your goal is broad mineral support rather than sodium.
Flavor and drinkability. Because Ultima has so little sodium, it tastes like a light flavored drink rather than salt water. Many people who find LMNT's 1,000mg sodium too salty drink Ultima without any adjustment period. For all-day sipping, the lighter taste is a genuine advantage.
Bulk value. Ultima's canister format (about 90 servings) avoids the per-packet premium of stick packs. You scoop what you need, which keeps the per-serving cost low.
Where LMNT Wins
Sodium content (1,000mg vs. 55mg). This is decisive for anyone who actually needs sodium. Endurance research supports replacing 500-1,150mg of sodium per liter of sweat during intense exercise.[1] One LMNT packet lands squarely in that range. To match it with Ultima, you'd need about 18 servings — which is neither practical nor affordable.
Cost per gram of sodium ($1.50 vs. $9.64). If sodium is the reason you're buying electrolytes, LMNT is more than 6x cheaper per gram. Ultima's low per-serving price is irrelevant once you account for how little sodium it delivers.
Low-carb, fasting, and POTS use. Carbohydrate restriction raises sodium excretion, and most low-carb and fasting protocols recommend adding sodium to prevent fatigue, headaches, and cramps.[1] POTS patients are often advised to target 3,000-10,000mg of sodium daily. Ultima's 55mg makes no meaningful dent in any of these targets; LMNT does.
Portability and pre-measured dosing. LMNT's stick packs are pre-portioned and travel-friendly — no scoop, no measuring, no canister. For gym bags, travel, and on-the-go use, that convenience is part of what you're paying for.
The Cost-Per-Serving Trap
Ultima vs LMNT is the clearest example of why "price per serving" is a misleading way to shop for electrolytes. By that metric, Ultima looks like the obvious value at $0.53. But electrolyte products aren't interchangeable units — they contain wildly different amounts of the mineral most people are actually trying to replace.
Sodium ranges roughly 18x across these two products alone. Across the broader market it varies even more. So a "cheap" serving of a 55mg product and an "expensive" serving of a 1,000mg product aren't comparable. The honest comparison is cost per gram of sodium, and on that measure Ultima is one of the more expensive options despite its low sticker price. How much electrolytes should actually cost breaks this down across all 17 brands.
Who Should Choose Ultima Replenisher
- Daily, low-intensity hydration. Desk work, light workouts, and everyday sipping where you don't need high sodium.
- Magnesium and potassium seekers. If broad mineral support matters more than sodium, Ultima's 100mg magnesium and 250mg potassium lead this matchup.
- People who find LMNT too salty. Ultima's light flavor is far easier to drink all day.
- Budget-focused buyers who don't need sodium. At $0.53/serving, it's one of the cheaper per-serving options — just know what you're (not) getting in sodium.
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 need zero-sugar sodium to avoid the "keto flu" and fasting fatigue.
- POTS and dysautonomia patients following high-sodium guidance from their doctor.
If LMNT's saltiness is too much at first, start with half a packet in 32 oz of water and build up. And if your main objection to LMNT is the price, there are cheaper alternatives to LMNT that keep the high sodium while cutting the cost per serving.
The Bottom Line
Ultima Replenisher and LMNT aren't really competitors. Ultima is a light, affordable, magnesium-forward daily hydration drink at $0.53/serving. LMNT is a high-sodium supplement at $1.50/serving for people who need serious sodium replacement. If you don't need much sodium, LMNT is overkill and Ultima is the better daily value. If you do need sodium, Ultima can't deliver it at any reasonable cost, and LMNT — or a cheaper high-sodium alternative — is the right tool.
For a full breakdown of how Ultima and LMNT stack up 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