Liquid I.V. vs. LMNT vs. Nuun: Which Electrolyte Mix Is Best?

Electrolytes are having a moment, but the three products people mention most often are built for very different jobs. Liquid I.V. is designed around a classic oral rehydration formula with some sugar. LMNT is a high-sodium, zero-sugar option for people who lose a lot of salt. Nuun is a light, portable tablet that adds a modest electrolyte boost to a water bottle.

That means the best pick is not simply the one with the biggest numbers or the shortest ingredient list. It depends on how much you sweat, whether you want zero calories, how sensitive you are to sweetness, and whether you are mixing one serving into a bottle or a large glass of water.

The Short Version

Choose Liquid I.V. when you want a sweeter, fuller hydration drink after heat exposure, travel, or a long day on your feet. Choose LMNT when your priority is a serious sodium dose with no sugar, especially for keto, fasting, or heavy endurance training. Choose Nuun when you want a gentle, fizzy tablet for everyday workouts and easy carrying.

For a zero-calorie lifestyle, LMNT is the clear fit between these three. Nuun is low-calorie rather than calorie-free, while Liquid I.V. is a conventional low-sugar hydration product, not a zero-calorie one.

How the Formulas Compare

The biggest difference is not flavor; it is the amount and type of electrolyte support each serving provides. Liquid I.V. uses glucose alongside sodium and potassium. That combination is based on the same general principle as oral rehydration solutions: a balanced amount of sugar can help transport sodium and water through the small intestine. It also means a packet contains 110 calories and 11 grams of sugar.

LMNT takes the opposite approach. Its variety pack provides 1,000 mg of sodium, 200 mg of potassium, and 60 mg of magnesium with zero sugar and zero calories. That high sodium level can be useful when sweat losses are substantial, but it can taste intensely salty if you are only looking for flavored water.

Nuun Sport lands in the middle. One tablet supplies 300 mg of sodium, 150 mg of potassium, 25 mg of magnesium, and 13 mg of calcium, with 10 calories. The tablet format is convenient: drop it into 16 ounces of water, wait for the fizz to settle, and drink.

Product	Calories	Sugar	Sodium	Format	Best fit
Liquid I.V. Passion Fruit	110	11g	500mg	Powder packet	Heat, travel, longer days
LMNT Variety Pack	0	0g	1,000mg	Powder stick	Keto, fasting, heavy sweat
Nuun Sport	10	1g	300mg	Effervescent tablet	Everyday workouts, portability

Liquid I.V.: The Sweetest and Most Familiar

Shop Liquid I.V. Passion Fruit if you want a drink that feels closer to a sports beverage than a mineral supplement. The Passion Fruit flavor is bright and sweet, and the powder dissolves quickly in a full glass or bottle. Its 500 mg of sodium is meaningful without being aggressive, and the packet also provides 380 mg of potassium plus several B vitamins and vitamin C.

The tradeoff is important for LumaZero readers: Liquid I.V. is not zero-calorie. Eleven grams of sugar is less than many traditional sports drinks, but it still counts if you are tracking sugar, following a keto plan, or choosing only calorie-free beverages. It is best viewed as a targeted hydration tool, not an everyday replacement for plain water.

LMNT: The High-Sodium Zero-Sugar Choice

Shop the LMNT Electrolyte Variety Pack when sodium is the feature you are looking for. At 1,000 mg per serving, LMNT delivers about twice the sodium of Liquid I.V. and more than three times the amount in Nuun Sport. The zero-sugar formula is sweetened with stevia, and the variety pack gives you both familiar citrus and fruit flavors plus more adventurous options such as mango chili and lemon habanero.

LMNT makes the most sense for people who know they sweat heavily, train in hot conditions, eat very low carbohydrate, or are experimenting with fasting. It is probably too much for someone sitting at a desk who simply wants a lightly flavored drink. If you have been advised to limit sodium, ask your clinician before making a high-sodium mix part of your routine.

Nuun: The Lightest Everyday Option

Shop Nuun Sport Tablets if convenience matters more than a large electrolyte dose. The tubes pack easily into a gym bag, desk drawer, or carry-on, and the mild fizz makes the experience feel different from a powder stick. At 300 mg of sodium and 10 calories per tablet, Nuun is a reasonable middle ground for a normal workout or a warm afternoon when you want more than plain water but less than a heavy hydration formula.

Nuun is also the easiest to portion. You can drop one tablet into a 16-ounce bottle and stop there, rather than measuring powder. The limitation is that it is not technically calorie-free, and its electrolyte dose may feel underpowered after a very long run, a sauna session, or hours of outdoor work.

Which One Should You Buy?

Pick Liquid I.V. if you prefer a sweet, familiar sports-drink profile and want a moderate sodium dose with carbohydrate. It is the most approachable choice for travel, hot weather, or the occasional recovery drink, but it does not meet a zero-calorie brief.

Pick LMNT if you want the strongest electrolyte profile and no sugar. It is the standout for keto and high-sweat situations, but the saltiness is a feature, not a flaw: use it because you need more sodium, not because you want a subtle flavored water.

Pick Nuun if you want a small, portable boost for everyday movement. Its tablet format and modest nutrition panel make it the least demanding option, especially for people who do not need a large sodium load.

No electrolyte product can replace consistent fluid intake, food, sleep, or medical advice. But once you match the formula to the situation, the choice is straightforward: Liquid I.V. for carbohydrate-supported hydration, LMNT for high-sodium zero-sugar performance, and Nuun for light everyday convenience.