Liquid I.V. vs LMNT: Which Electrolyte Mix Fits You?

Liquid I.V. vs LMNT at a Glance

Doses above are from the current U.S. Drug Facts or prescribing labels listed in Sources. Always follow the label on the package you buy, because store brands and formulations differ.

Glucose vs Salt-Forward

In the small intestine, sodium and glucose are absorbed together, pulling water with them. That is why the World Health Organization’s oral rehydration solution (ORS) pairs the two. Liquid I.V. uses this idea with 11 g of sugar per stick, though it is not the same as medical ORS, which has a set sodium-to-glucose ratio. LMNT skips sugar and delivers much more sodium, reflecting the large sodium losses some people have in sweat.

Putting the Sodium in Context

The Dietary Guidelines for Americans advise most adults to keep sodium under 2,300 mg per day. One LMNT stick is about 43% of that; one Liquid I.V. stick is about 22%. For athletes who lose a lot of salt in sweat, that sodium is the point. For sedentary people, or anyone with high blood pressure, heart failure or kidney disease, adding 1,000 mg of sodium a day can be a problem.

Putting the Sugar in Context

Liquid I.V.’s 11 g of sugar counts toward the Dietary Guidelines limit of less than 10% of calories from added sugars. That is modest during exercise or illness but adds up if you drink several a day for flavor. People managing diabetes should count it as carbohydrate or choose a sugar-free option.

How Both Compare With Medical Oral Rehydration Solution

For dehydration from diarrhea or vomiting, the reference standard is the WHO/UNICEF reduced-osmolarity oral rehydration solution (ORS). Per WHO, it contains 75 mmol/L sodium and 75 mmol/L glucose (total osmolarity 245 mOsm/L). The glucose is there on purpose: sodium and glucose are absorbed together in the small intestine, which pulls water with them.

• Liquid I.V. uses the same sodium-plus-glucose principle (the brand calls it Cellular Transport Technology), so it is closer in concept to ORS, but it is a consumer product, not a medical ORS, and its sugar and sodium don’t match the WHO formula exactly.
• LMNT is salt-forward with no sugar, so it does not use glucose co-transport. It is designed for people who sweat heavily or eat low-carb, not as an ORS.
• For illness, especially in children, older adults or anyone who can’t keep fluids down, pharmacy ORS products are the safer choice, and persistent vomiting, signs of dehydration or bloody diarrhea need medical care.

Potassium: The Other Electrolyte

ODS lists an adequate intake for potassium of 3,400 mg/day for men and 2,600 mg/day for women, and the Dietary Guidelines name potassium a nutrient of public health concern because most Americans fall short. Both drinks provide a few hundred milligrams per serving, so they contribute but don’t replace potassium-rich foods such as beans, potatoes, bananas and leafy greens. People with kidney disease or who take potassium-sparing medications should check with a clinician before using electrolyte products regularly.

Hydrating in Heat and Long Workouts

For most short workouts, water is enough. For people active in heat, NIOSH recommends drinking about 1 cup (8 oz) of water every 15–20 minutes rather than waiting until thirsty, switching to drinks with balanced electrolytes if sweating lasts several hours, and generally not exceeding 6 cups (48 oz) of fluid per hour, since overdrinking plain water can dangerously lower blood sodium. That is where a salty product like LMNT or a sodium-containing mix like Liquid I.V. can fit, alongside meals.

Kids and Teens

The American Academy of Pediatrics advises that sports drinks are unnecessary for most children and teens during routine physical activity, and that water should be the main drink. For illness with vomiting or diarrhea in children, use an oral rehydration solution designed for kids and follow your pediatrician’s guidance; LMNT’s high sodium and Liquid I.V.’s sugar content are formulated for adults.

Sodium, Blood Pressure and Overdrinking

The Dietary Guidelines advise adults to keep sodium under 2,300 mg per day, and the American Heart Association suggests an ideal limit of 1,500 mg for most adults, especially those with high blood pressure. A salt-forward electrolyte drink can use a large share of that in one serving, which makes sense after hours of heavy sweating but not as an everyday beverage for someone who is sedentary or has hypertension, heart failure or kidney disease.

The opposite problem matters too. Exercise-associated hyponatremia, a dangerous drop in blood sodium, happens mainly when athletes drink more fluid than they lose during long events. An international consensus statement (Hew-Butler et al., 2015) recommends drinking to thirst rather than forcing fluids, and notes that sports drinks don’t prevent hyponatremia if you overdrink. Electrolyte products help replace what sweat removes; they aren’t a license to drink unlimited amounts.

Electrolyte Comparison Chart

Amounts per serving as listed on each product’s label (NIH Dietary Supplement Label Database or the manufacturer), with the WHO oral rehydration solution (ORS) for reference. Serving sizes differ, so compare per serving and check the flavor you buy, because labels change.

How to read it: salt-forward mixes such as LMNT give the most sodium per serving. Liquid I.V. pairs sodium with glucose, closer to the ORS design. Nuun is a lighter tablet. Ultima is low in sodium and higher in magnesium. For diarrhea or vomiting, especially in children or older adults, a true oral rehydration solution is the reference standard. The Dietary Guidelines advise most adults to keep sodium under 2,300 mg a day.

Is there an electrolyte comparison chart?

Yes. The chart on this page lists sodium, potassium, magnesium, carbohydrate and calories per serving for Liquid I.V., LMNT, Nuun Sport and Ultima, with WHO ORS as a reference.

Who Should Choose What

• Mild dehydration from vomiting or diarrhea (adults): Liquid I.V. or, better, a true ORS; seek care if you can’t keep fluids down.
• Long, hot workouts or salty sweat stains: LMNT, or Liquid I.V. if you also want carbohydrate.
• Keto or fasting: LMNT (no sugar).
• Everyday hydration at a desk: plain water is usually enough.
• High blood pressure, heart or kidney disease: ask your clinician before either.

Also comparing: electrolyte supplements guide and electrolyte drinks vs water.

When to Talk to Your Doctor or Pharmacist

• Signs of significant dehydration: confusion, fainting, very little urine, rapid heartbeat.
• Vomiting or diarrhea lasting more than 2 days, or blood in stool.
• You have high blood pressure, heart failure, kidney disease, or a sodium or fluid restriction.
• You take diuretics, ACE inhibitors, ARBs or other medicines affecting potassium.

Frequently Asked Questions

Sources

• LMNT: Supplement/Nutrition Facts (manufacturer)
• Liquid I.V.: Hydration Multiplier Nutrition Facts (manufacturer)
• Dietary Guidelines for Americans 2020–2025
• NIH Office of Dietary Supplements: Magnesium Fact Sheet for Health Professionals
• NIH Office of Dietary Supplements: Potassium Fact Sheet for Health Professionals
• PubMed: oral rehydration solution sodium glucose cotransport
• PubMed: sweat sodium losses in athletes
• WHO/UNICEF: Oral Rehydration Salts — production of the new ORS
• NIH Office of Dietary Supplements: Potassium Fact Sheet
• NIOSH: Heat stress workplace recommendations (hydration)
• PubMed: AAP clinical report, sports drinks and energy drinks for children and adolescents (2011)
• American Heart Association: How much sodium should I eat per day?
• PubMed: Hew-Butler et al., statement of the third international exercise-associated hyponatremia consensus conference (2015)
• Dietary Guidelines for Americans
• NIH DSLD: Liquid I.V. Hydration Multiplier Lemon Lime label
• NIH DSLD: Nuun Sport Grape label
• NIH DSLD: Ultima Replenisher Lemonade label

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